Eurotherm 4181/4250 Chart Recorders Serial Comms Owner's Manual

Serial

Communications

Manual

ε

E U R O T H E R M

COMMUNICATIONS MANUAL

Communications Manual

List of contents

Section Page

1 INTRODUCTION ......................................................... 3

2 INSTALLATION ........................................................... 4

2.1 INSTALLATION OF ORIGINAL VERSION

(OLDER 250mm RECORDERS ONLY) ......... 4

2.1.1 Mode selection ...................................................................... 5

2.2 ISOLATED VERSION INSTALLATION ..................................... 6

2.2.1 Installation for 250 mm recorders ............................................. 6

MULTIPOINT RECORDERS ................................................. 6

CONTINUOUS TRACE RECORDERS .................................. 6

2.2.2 Installation for 180 mm recorders ............................................ 7

2.2.3 Mode selection ...................................................................... 9

2.3 COMMUNICATIONS WIRING ............................................ 9

2.3.1 Original version .................................................................... 9

2.3.2 Isolated version ..................................................................... 9

2.3.3 Termination and biasing (not RS232) ....................................... 11

HOST COMPUTER ........................................................... 11

2.3.4 On-board links ...................................................................... 13

2.4 HARDWARE CONFIGURATION ........................................... 14

2.4.1 Communications parameters ................................................... 14

2.4.2 Handshake ........................................................................... 14

HARDWARE HANDSHAKE ............................................... 14

SOFTWARE HANDSHAKE ................................................ 14

3 MODEL 4001 COMMUNICATIONS ....................................... 15

3.1 COMMUNICATIONS PROTOCOLS ............................. 15

3.1.1 ANS I ................................................................................. 15

POLLING ......................................................................... 15

SELECTION ..................................................................... 16

3.1.2 ASCII .................................................................................. 16

3.2 PARAMETER ADDRESSING ................................................. 17

3.3 DATA FORMATS ................................................................. 17

3.3.1 Hexadecimal (Hex) ................................................................ 17

3.3.2 Decimal (Floating point) ......................................................... 17

3.3.3 Character ............................................................................. 17

Continued

© 2002 Eurotherm Limited

All rights are strictly reserved. No part of this document may be reproduced, modified, or transmitted in any form by any means, nor may it be stored in a retrieval system other than for the purpose to act as an aid in operating the equipment to which the document relates, without the prior written permission of

Eurotherm limited.

Eurotherm Limited pursues a policy of continuous development and product improvement. The specifications in this document may therefore be changed without notice. The information in this document is given in good faith, but is intended for guidance only. Eurotherm Limited will accept no responsibility for any losses arising from errors in this document.

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Page 2


List of contents (Cont.)

Section Page

3.4 MNEMONICS ................................................................... 18

3.4.1 Channel mnemonics ............................................................... 19

INPUT CHANNELS ........................................................... 20

OUTPUT CHANNELS ........................................................ 22

DERIVED CHANNELS ....................................................... 24

3.4.2 Alarm mnemonics .................................................................. 25

ALARM BUFFER VALIDATION CHECKS. .............................. 25

3.4.3 Instrument mnemonics ............................................................ 27

3.5 COMMAND MNEMONICS ................................................ 31

3.5.1 Alarm acknowledge (AA) ....................................................... 31

3.5.2 Printer on (CG) ...................................................................... 31

3.5.3 Chart halt (CH) ...................................................................... 31

3.5.4 Printer off (CO) ...................................................................... 31

3.5.5 Chart Wind (CW) ................................................................. 31

3.5.6 Data Dump (DD) .................................................................... 31

3.5.7 Disable program mode (DP) .................................................... 31

3.5.8 Enter alarm data (EA) ............................................................. 31

3.5.9 Enter channel data (EC) .......................................................... 31

3.5.10 Enable program mode (EP) ................................................... 31

3.5.11 Get indicated alarm data (GA) .............................................. 32

NO MATHS PACK FITTED ................................................. 32

MATHS PACK FITTED ........................................................ 32

3.5.12 Get free alarm (GF) ............................................................. 32

3.5.13 Chart rewind (CR) ............................................................... 32

3.6 PARAMETER SCROLLING .................................................... 33

3.6.1 Block parameters ................................................................... 33

3.6.2 Scroll parameters .................................................................. 33

ALARM PARAMETERS ....................................................... 33

INSTRUMENT PARAMETERS .............................................. 33

3.7 CHARACTER SET ............................................................... 34

3.8 APPLICATION NOTES ........................................................ 40

3.8.1 Message timing ..................................................................... 40

3.8.2 Command mnemonics ............................................................ 40

3.8.3 Channel selection .................................................................. 40

3.8.4 Alarm selection / polling ........................................................ 40

SELECTION ..................................................................... 40

3.8.5 Printed text ........................................................................... 40

3.8.6 Special characters ................................................................. 41

ASCII MODE ................................................................... 41

ANSI MODE ................................................................... 41

3.8.7 Multi-parameter data packets .................................................. 41

3.8.8 Digital input channels ............................................................. 41

3.8.9 Floating point overflow ........................................................... 41

4 GOULD MODICON MODBUS PROTOCOL ..................... 42

4.1 CHANNEL ADDRESSING.................................................... 42

4.2 READING ANALOGUE VALUES ........................................... 42

4.2.1 16-bit format ......................................................................... 42

4.2.2 32-bit format ......................................................................... 43

EXAMPLE 1 READ CHANNEL 05 ....................................... 43

TOTALISER VALUES........................................................... 43

4.3 FUNCTION CODES ........................................................... 44

5 XMODEM TRANSFER .................................................. 46

6 LIST OF EFFECTIVE PAGES ........................................... 47

INDEX ........................................................................... 48

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COMMUNICATIONS

1 INTRODUCTION

This manual is intended as an aid to those involved in the installation and operation of a serial communications link between one or more chart recorders (or I/O racks) and a host computer.

Section 2 describes the physical installation of a communications option and its hardware set-up and wiring.

Section 3 describes host communications protocol emulation of the 4001 communications protocol allowing customers with model 4001 recorders to transfer their communications programs to more modern recorders without difficulty.

Section 4 deals with the Gould Modicon Modbus RTU protocol.

Section 5 gives a procedure for XMODEM file transfers, for saving and restoring recorder configurations.

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2 INSTALLATION

The communications option is in two versions. The original version has a 25-way D-type connector, whilst the newer

(isolated) version has two 9-way D-type connectors - one plug; one socket. Before installation is carried out, it is recommended that the links on the circuit board be checked against figure 2.3.4 to ensure correct positioning.

2.1 INSTALLATION OF ORIGINAL VERSION (OLDER 250MM RECORDERS ONLY)

This section describes the installation of the communication option in the box located at the rear of the recorder. For those recorders already fitted with the option, this section may be ignored.

CAUTION

THE CIRCUIT BOARD INCLUDED AS A PART OF THE KIT CONTAINS COMPONENTS WHICH

ARE SENSITIVE TO STATIC ELECTRICAL DISCHARGE. ALL RELEVANT PERSONNEL SHOULD

BE AWARE OF STATIC HANDLING PROCEDURES. IF IN DOUBT, CONSULT THE RELEVANT

SECTIONS OF EITHER THE INSTALLATION AND OPERATION MANUAL OR OF THE TECHNI-

CAL MANUAL.

The communications option kit consists of a circuit board, two screws and two labels. The installation procedure is as follows. Reference should be made to figures 2.1a and 2.1b as required.

a.

Remove the battery cover, retaining it and its securing screws for later re-assembly.

b.

Remove the communications box by removing the two securing nuts. Retain these nuts and their associated shakeproof washers for use in re-assembly.

c.

Knock out the three slots in the box.

d.

Fit the labels supplied e.

After taking precautions against static discharge, screw the circuit board to the box.

f.

Plug the assembled box into the connector at the rear of the recorder.

g.

Fix the box to the recorder using the nuts and shake-proof washers previously removed.

h.

Refit the battery cover.

i.

Select RS232 or RS422/485 (section 2.1.1 below), then carry out an autoconfigure as described in the installation and operation manual supplied with the recorder.

Page 4

Figure 2.1a Battery cover and communications box location

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2.1 INSTALLATION OF ORIGINAL VERSION (Cont.)

3

Fit board to box

4

Plug box into recorder

1

Knock out holes

2

Fit labels

2.1.1 Mode selection

Set all elements left for

RS42/RS485, or right for RS232C

Tx

Rx

RTS

CTS

DTR

DSR

Figure 2.1b Communications option assembly

The communications can be set to RS232 or RS422/RS485 by sliding all the elements of the DIL switch to the right (RS232) or to the left (RS422/485).

In RS232 mode, the LEDs show their stated functions. The LEDs are off when the relevant lines are idle, and are illuminated when they are active.

In RS422/485 mode, only the transmit (Tx) and receive (Rx) LEDs are operative. These LEDs are off when the lines are at idle, and are illuminated when they are active.

The pin allocations for RS422/485 and RS232 are shown in section 2.3.1 below.

Note: Four wire (TXA/B, RXA/B) RS485 is supported; two wire RS485 is not supported.

25-Way D-type socket

Comms status

LEDs

Figure 2.1.1

Communications set-up switches

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2.2 ISOLATED VERSION INSTALLATION

2.2.1 Installation for 250 mm recorders

MULTIPOINT RECORDERS

With the recorder isolated from hazardous voltages, remove the battery cover and dummy comms box (if fitted) as described in section 2.1 instructions 'a' and 'b'. Fit the comms module supplied with the kit, ensuring that the connector is correctly mated before tightening the fixings and replacing the battery cover.

Re-apply power to the recorder, switch on and carry out an Autoconfigure, as described in the installation and operation manual supplied with the recorder.

CONTINUOUS TRACE RECORDERS

With the recorder isolated from hazardous voltages, take the ribbon cable supplied with the kit, and plug it into the header on the comms module circuit board.

Pass the ribbon cable through the slot in the rear of the recorder, then secure the comms module to the recorder using two nuts.

Open the recorder door and release the writing system by undoing the two captive screws (fig 2.2.1a)

Pull the writing system forwards until access can be gained to the control board mounted at the rear.

Plug the free end of the ribbon cable into CON 3 on the control board (figure 2.2.1b).

Return the writing system to the case and secure it, using the two captive screws.

CON3

(Communications)

Figure 2.2.1a Writing system securing screws

Set the comms module to RS232 or RS422/

485 as described in section 2.2.3.

Re-apply power to the recorder, switch on and carry out an Autoconfigure, as described in the installation and operation manual supplied with the recorder.

Page 6

Figure 2.2.1b Communications connector location

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2.2.2 Installation for 180 mm recorders

CAUTION

THIS UPGRADE INVOLVES THE HANDLING OF COMPONENTS WHICH ARE SENSITIVE TO

STATIC ELECTRICAL DISCHARGE. ALL RELEVANT PERSONNEL MUST BE AWARE OF STATIC

HANDLING PROCEDURES. IF IN DOUBT, REFERENCE SHOULD BE MADE TO THE INSTAL-

LATION AND OPERATION MANUAL OR THE TECHNICAL MANUAL.

1.

Isolate the recorder from all high voltage sources (both supply and signal)

2.

Open the recorder door (by lifting the bottom of the catch, and then turning it clockwise) For convenience, remove the chart and print cartridge.

3.

With the cassette open, Release the writing system by undoing the captive screws (‘A’ in figure 2.2.2a)

4.

Pull the writing system forwards until it reaches its stops.

5.

Lift the writing system out of the case, releasing the various connectors as they become accessible (figure 2.2.2b).

6.

Release the Power supply unit from the front, using screws ‘B’ in figure 2.2.2b, then from the back, by removing the safety earth

(nut ‘C’ in figure 2.2.2c) and securing screw ‘D’.

A

Figure 2.2.2a

Writing system securing screws

A

B

B

B

Figure 2.2.2b Writing system removal and PSU securing screw locations

7.

Disconnect the battery pack as shown in figure 2.2.2d

8.

Rotate and lift out the power supply as shown in figure 2.2.2e, carefully avoiding damage to the battery pack connector.

C

D

Figure 2.2.2c

PSU release (rear view)

Figure 2.2.2d Battery pack disconnection

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Figure 2.2.2e PSU removal

Page 7


2.2.2 INSTALLATION FOR 180mm RECORDERS (Cont.)

9.

Fit the plastic cable clip as shown in figure 2.2.2f.

10. At the rear of the recorder, remove the blanking plate, and fit the communications module (figure 2.2.2g).

11. Feed the communications module ribbon cable across the inside back of the recorder, secure it with the clip, then fold the cable back on itself and make a right angle turn upwards (figure 2.2.2f).

12. Re-fit the power supply unit, and ensuring that the battery pack connector is passed through its aperture, secure it at the front and at the back, using the four screws and safety earth nut previously removed. ENSURE THAT

THE SAFETY EARTH IS SECURELY TERMINATED.

13. Return the writing system to the case, ensuring all the connectors are re-made.

14. Re-apply power to the recorder, and carryout an Autoconfigure as described in the Installation and Operation manual suppled with the recorder.

To comms module

To control board

Cable cl ip

65 mm View on inside of case; bottom left-hand corner

Figure 2.2.2f Cable clip location Figure 2.2.2g Comms module fitting

Page 8

Figure 2.2.2h Routing cables and returning the PSU Figure 2.2.2i Communications connector location

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Issue 11 Dec 97


2.2.3 Mode selection

Once physical installation is complete, the communications mode should be set up as RS232 (Single drop) or RS422/

RS485 (Multiple drop) before electrical connections are made.

The selection of communications mode is made by setting ALL of the switches located between the two 9-way D-types up for RS232 or down for RS422/485*, as shown on the communications module label.

* The module is mounted ‘sideways’ on Graphics Display Units. The switches should be set left for RS232 or right for

RS422/485.

Set all switches up for RS232.

Set all switches down for RS422/485.

9-way socket

9-way plug

Figure 2.2.3 Set-up switch locations (isolated version)

2.3 COMMUNICATIONS WIRING

2.3.1 Original version

The serial link is implemented using a 25-way D-type (fixed socket) connector. Table 2.3 gives pin-out information for

RS232C and for RS422/485. Recorder Tx should be connected to the host Rx and vice-versa.

2.3.2 Isolated version

Tx should be connected to Rx at the host and vice-versa.

The serial link is implemented using two 9-way D-type connectors. For non-graphics instruments set to RS422/485, the two connectors are wired in parallel for easy ‘daisy-chaining’ in multi-drop applications. For non-graphics instruments set to RS232, and for all data acquisition racks, only the ‘male’ connector (plug) is to be used.

See the graphics unit manual for graphics recorders/display units details.

Note: The signal ground MUST be earthed at one point (only) in the link.

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2.3 COMMUNICATIONS WIRING (Cont.)

Isolated Comms

(2 x 9-way D-types)

Pin Function

4

5

6

1

2

3

7

8

9

RX

TX

1k0

DTR

Signal ground

DSR

RTS

CTS

5V

Not connected

RS232 Pin out

(Switches up)

(Fixed plug only)

Pin Function

4

5

6

1

2

3

7

8

9

TXA

1k0

TXB

5V

Not connected

Signal ground

Not connected

RXB

RXA

Not connected

RS422/485 Pin out

(Switches down)

(Plug or socket)

Comms pinouts for current recorders and I/O (data acquisition) racks.

(I/O racks may use only the fixed male connector (plug) for the serial link)

Page 10

RS232 Terminations RS422/485 Terminations

5v* Rx Tx DTR 0V DSR RTS CTS

RS232 available with upper connector only (all switches left)

5v* TxA TxB NC 0V NC RxB RxA

Lower connector always RS422/485.

Upper connector selectable RS232

(all switches left) or RS424/485

(all switches right)

Comms pinouts for Graphics Display Units

Pin Function

6

7

19

20

1

2

3

4

5

Protective ground

TX

RX

RTS

CTS

DSR

Signal ground

5V

DTR

1k0

RS232 Pin out

(Switches right)

Non-Isolated Comms

(25-way D-type)

Pin Function

6

7

19

20

1

2

3

4

5

Protective ground

TXB

TXA

RXB

RXA

Not connected

Signal ground

5V

1k0

Not connected

RS422/485 Pin out

(Switches left)

Comms pinouts for previous recorder versions

Table 2.3 Communications module pinouts

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2.3.3 Termination and biasing (not RS232)

If the communications line is left open-ended, the end of the cable acts as a reflector, returning what can appear to be

‘true’ data signals back down the line. A receiver cannot distinguish between ‘true’ and reflected data, with the result that the ‘true’ data is corrupted.

In order to avoid this, a termination resistor is fitted across the line at the final instrument. If the value of this resistor is equal to the characteristic impedance of the cable (120 Ohms in this case), then the line appears to be of infinite length and no reflections occur. Such a value however, does not give the best signal-to-noise ratio, so a compromise value (220 Ohms) is chosen to give the optimum performance in reducing unwanted reflections and in improving the signal-to-noise ratio.

The recorder communications port is terminated as shown in figure 2.3.3a, below. In a single point-to-point application, it may be necessary to terminate the instrument with a 220

Ω

resistor. In multi-drop systems, only the final unit should be terminated in this way, otherwise the transmitted signal levels may be reduced to an unacceptable level.

TxB

Transmit lines from host

TxA

RxA

100k

Ω

RxB

5 Volts

100k

Ω

RxB

220

Ω

RxA

5 Volts

100k

Ω

Receiver device

100k

Ω

0 Volts

Recorder B (Final recorder)

0 Volts

Receiver device

Recorder A

Figure 2.3.3a System termination and biasing

HOST COMPUTER

When not communicating, the instrument outputs go to a high-impedance state to allow multi-drop connection. This will cause a problem if the host computer is not fitted with biasing resistors to pull these essentially open circuit lines to their idle states as defined for the RS422/RS485 standards. To overcome such problems, external biasing resistors can be fitted as shown in figure 2.3.3b (a) below.

With long cable runs it may also be necessary to terminate the transmission line. Figure 2.3.3b (b) shows how this may be done using external biasing resistors. Such a circuit is for use where the host receiver does not have its own internal biasing arrangements. Where the host does have its own internal biasing, the fitting of a 220

Ω

resistor across the receive inputs (figure 2.3.3b (c)) will terminate the line correctly.

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2.3.3 TERMINATION AND BIASSING (Cont.)

Host receiver device

5 Volts

4k7

TxB

Transmit lines from recorder*

TxA

4k7


5 Volts

470R

TxB


TxA

470R

0 Volts a. Host with external bias resist ors

0 Volts b. Host with external bias resistors providing termination.

5 Volts

4k7 min.

* For 'recorder' read 'Graphics unit',

'Data acquisition unit' etc. as appropriate


TxB

220R


TxA 4k7 min.

0 Volts c. Host with internal bias resistors and ext ernal termination.

Figure 2.3.3b Host computer termination and biasing

Page 12

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2.3.4 On-board links

When retro-fitting or replacing a communications board, a number of links need to be correctly set. The positions of these links depends on the model as shown in the sketches below. The sketches show an issue 2 board. Issue 1 boards are similar, but do not have links at 'A'. This is important only for I/O rack users.

The communications link is set to RS232 by setting all the toggle switches up (as shown in the figures) or to RS422/

485 by setting all the switches down.

A A

180mm graphics recorder (U100)

250mm graphics recorder (U200)

180/250mm continuous trace recorder (U100)

180mm multipoint recorder (U100)

250mm Multipoint recorder (U200)

A A

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Issue 14 Mar 02

Graphics display unit (U200) I/O (Data acquisition) rack (U200)

Figure 2.3.4 Communications board link positions

Page 13


2.4 HARDWARE CONFIGURATION

Configuration : Select a category

MEMORY COMMS TRANSFER DIAGS MORE>

Top level configuration menu

Protocol 4001 ANSI Baud Rate BBBBB

Parity Even Seven data bits

One stop bits Hardware handshake off

Group address 0

Figure 2.4 Communications configuration

2.4.1 Communications parameters

Protocol

Baud Rate

Parity

Data Bits

4001 ANSI*

4001 ASCII*

MODBUS

110 to 19,200

Odd, even, none

7, 8

Stop bits 1, 2

H/W Handshake On/Off

Group Address

Address

0 to 7

1 to 247

Uses ASCII codes, including control codes (e.g. STX)

Uses ASCII codes, but control codes are replaced by printing characters

(See section 3.1.2 below).

RTU protocol. Fixed data bits = 8; No handshake.

Scrollable 19,200, 9,600, 4,800, 2,400 1,200, 600, 300, 110

Allows parity to be set.

Eight bits required for ‘special’ characters Hex 80 to E2 in table 3.7.

Allows the number of stop bits to be set.

Enables / Disables handshake.

Group address (G) used as a part of the 4001 channel address.

Gould Modicon address

* 4001 ASCII and 4001 ANSI protocols may not be applicable to all recorder models.

2.4.2 Handshake

Handshake is not applicable to MODBUS protocol.

HARDWARE HANDSHAKE

Hardware handshake operates with three signals CTS, RTS and DTR. DSR is ignored by the recorder.

When hardware handshake is ‘ON’, DTR and RTS outputs are set to their ‘ON’ condition (voltage +’ve) when the instrument is capable of communication. These signals will therefore be off during power up / initialisation etc. The

CTS input high to the instrument enables its transmitter.

When hardware handshake is set ‘OFF’ DTR and RTS are set to their OFF states (voltage -’ve). The CTS input is ignored.

SOFTWARE HANDSHAKE

XON/XOFF handshaking is implemented in ASCII mode only (section 3.1.2). On receipt of XOFF (ASCII hex 13) the recorder will stop transmitting at the end of the current character, and will not re-start transmission until it receives

XON (ASCII hex 11). All bytes received between XOFF and XON are ignored. Multiple XONs are ignored. The instrument does not generate XON or XOFF.

Page 14

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3 MODEL 4001 COMMUNICATIONS

Note: 4001 communications protocols may not be available on all Models.

3.1 COMMUNICATIONS PROTOCOLS

3.1.1 ANSI

This is an implementation of the ANSI standard ANSI - X3.28 - 2.5 - A4 and specifies two modes: POLLING (for reading values from an instrument), and SELECTING (for writing values to an instrument).

POLLING

The sequence of bytes sent to the instrument in order to read a value is:

<EOT>[G][G][U][U][CA][C1][C2]<ENQ>

Where:

G

U is the Group Address set up in the communications configuration.

is a ‘Logical Unit’ number, associated with up to eight channel addresses.

CA is a channel address within the logical unit.

C1C2 is the two character mnemonic which defines the parameter to be read.

See table 3.2 for U and CA allocations, and tables 3.4.1, 3.4.2 and 3.4.3 for a mnemonic / parameter cross reference.

In response to such a polling message, the instrument will reply with one of the following:

POLL COMPLETE MESSAGE

<STX>[CA][C1][C2][D1][D2.......DN]<ETX>[BCC]

Where D1 to DN is the N byte value of the polled parameter. The number of bytes required is a function of the particular parameter polled. BCC is a block check control character which is the result of exclusive ORing bytes [CA] to

<ETX> inclusive. After a POLL COMPLETE message, the host can respond with <NAK> (which causes re-transmission of the parameter previously polled), <ACK> (which polls the next parameter in the poll list (see section 3.6)), or with a complete new polling message.

POLL INCOMPLETE MESSAGE

<STX>[CA][C1][C2]<EOT>

This indicates that there was an error in the polling message. The host must send a complete new polling message in order to access the parameter (i.e. sending <ACK> or <NAK> does not have any effect).

NO RESPONSE

The polling message was not recognised.

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3.1 COMMUNICATIONS PROTOCOL (Cont.)

SELECTION

The sequence of bytes sent to the instrument in order to write a value to a parameter is:

<EOT>[G][G][U][U]<STX>[CA][C1][C2][D1][D2.....DN]<ETX><BCC>

Where:

G

U

CA

C1C2 is the Group Address set up in the communications configuration.

is a ‘Logical Unit’ number, associated with up to eight channel addresses.

is a channel address within the logical unit.

is the two character mnemonic which defines the parameter to be read.

D1 to DN is the N-byte value to be written to the parameter.

BCC is a block check character calculated by exclusive ORing bytes CA to ETX inclusive.

See table 3.2 for U and CA allocations for current recorders and tables 3.4.1, 3.4.2 and 3.4.3 for a mnemonic / parameter cross reference.

In response to such a selection message, the instrument will reply with one of the following:

SELECTION COMPLETE MESSAGE

The instrument responds with a single <ACK>. The host may now re-enter the selection procedure after <STX> and write a new [CA] to <BCC> message, providing that the new parameter is in the same logical unit as the last one (i.e.

[G] and [U] are the same). Alternatively, the host can send a complete new selection message.

SELECTION INCOMPLETE MESSAGE

The instrument responds with a single <NAK>, indicating that there was an error in the selection message. The host must send a complete new selection message (i.e. it may not re-enter after STX)

NO RESPONSE

The selection message was not recognised.

3.1.2 ASCII

This mode is intended for use with simple micros, or ‘dumb’ terminals, which are unable to transmit ASCII control characters and / or having no hardware handshake. The non-printing control codes are replaced with ‘printing’ characters as shown in table 3.1.2 below. BCC is omitted, since it might easily be one of the control codes 22 to 26 or 28.

XON/XOFF handshaking is supported. In all other respects, the protocol is the same as the ANSI mode, described above.

Control character definition

Start of text

End of text

End of transmission

Enquiry

Acknowledge

Negative acknowledge

ANSI standard character

STX

ETX

EO T

ENQ

ACK

NAK

Hex code

4

5

2

3

6

15

Printing character

Hex code

"

#

$

%

&

(

22

23

24

25

26

28

Table 3.1.2 Printing and non-printing codes

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3.2 PARAMETER ADDRESSING

The protocol uses a three element address: Group Address (G) (0 to 7), set up in the communications configuration to identify one of up to eight recorders on a multi-drop link; Logical Unit Address (U) and Channel Address (CA). The recorder can have up to 16 logical units (LUs) associated with it according to the model number. LU 0 is used to access instrument, alarm and control mnemonics. In such cases, the channel address is irrelevant, but a valid CA (0 to

F) must still be included in the polling/selecting messages.

As can be seen from table 3.2 below, logical units can have up to 16 associated channel addresses (CAs). For example, to access Measuring Channel 28, the logical unit address (U) would be 7, and CA would be 3. To access Derived Channel 28, the LU address would be ‘C’ and the CA would be 3.

LOGICAL UNIT ADDRESS (U)

1 2 3 4 5 6 7 8 9 A B C D E F

7 57 66 75 84 93 D8 D16 D24 D32 D72 D80 D88

8 58 67 76 85 94

9 59 68 77 86 95

D33 D41 D49 D57 D89 D97

D34 D42 D50 D58 D90 D98

A 60 69 78 87 96 D35 D43 D51 D59 D91 D99

B 61 70 79 88 D36

C 62 71 80 89 D37

D 63 72 81 90 D38

E 64 73 82 91 D39

F 65 74 83 92 D40 D56

Table 3.2 Logical unit and channel addresses

3.3 DATA FORMATS

Current recorder protocol specifies a variable number of data bytes, according to the parameter being accessed. Three basic formats are used:

3.3.1 Hexadecimal (Hex)

Five data bytes are transmitted in the form >HHHH where > must always be present, followed by four hex bytes (H in the example). The data transferred may represent a single parameter, or a group of parameter values packed into a 16bit word and then Hex encoded.

3.3.2 Decimal (Floating point)

Five data bytes are transmitted in on of the following formats according to decimal point position and whether the value is positive (use decimal point) or negative (use – sign).

DDDD.

DDD.D

DD.DD

D.DDD

.DDDD

DDDD–

DDD–D

DD–DD

D–DDD

–DDDD

3.3.3 Character

A string of hex data bytes, the number of bytes being defined for each relevant parameter.

HA246958



IH

LG

LN

MV

NA

OC

OF

OH

OL

OS

PV

SH

ST

EU

FH

FL

IL

CF

CJ

DH

DL

3.4 MNEMONICS

The tables which follow, give an alphabetic list of mnemonics with definitions, formats etc. in the following groups.

All mnemonics must be in CAPITAL letters. 4001 mnemonics which are not emulated are not included in the tables.

In such cases, selection will be ignored, and polling will always return the value 0.

A1

A2

A3

A4

Channel mnemonics (see table 3.4.1)

Channel flags *

External CJ temperature.

Output signal high value.

Output signal low value.

Engineering units and print zone.

Function high value.

Function low value.

Input signal low value.

Input signal high value.

Legend string.

Legend number.

Measured value in hex.

Number of alarms assigned.

Constant output value

Offset value

Scale high value.

Scale low value.

Output source configuration †

CJ type

Function engineering units

Interpolation enable

Linearisation (function) type

Error drive

Source type

†

* Channel Flags are:

Scale print enable

Scale type

Trace skip

Output type

Output source configuration contents:

Process variable (Measured value scaled to engineering units).

Shunt value.

Channel status.

Source Channel number

Value format

Alarm mnemonics (see table 3.4.2)

Alarm type, hysteresis, average.

Alarm sense, alarm status, rate-of-change alarm period.

Set point as a proportion of channel scale.

Deviation, rate-of-change change value.

HR

IF

II

IS

BN

CS

DY

ER

L1/2/3

MI

MO

M2/3

PM

Instrument mnemonics (see table 3.4.3)

Batch number

Chart speeds A and B (See also IF)

Day number

Serial link communications errors

Hours

Instrument flags (Current chart speed, Date format, Internal CJ units)

Instrument identifier

Instrument alarm and printer on/off-line flags

User linearisation tables

(Not M1) Minutes

Month number

Mode 2(3) log interval A

Print mode

(Continued)

Page 18

HA246958

Issue 14 Mar 02


Instrument mnemonics (continued)

PT

RJ

SC

SE

T0

T1 to Tn

VN

XT

XE

YR

Text string to be printed

Remote CJ mode (Software versions 3.12 onwards)

Slot configuration

Seconds

Single Remote CJ configuration (Software versions 3.12 onwards)

Multiple remote CJ configurations for input boards 1 to n (Software versions 3.12 onwards)

Communications software version number

Enter XModem mode

Modem error code

Year

3.4.1 Channel mnemonics a) b) c)

NOTES:

1) Channel parameter updates are loaded into a buffer, until an EC mnemonic is received. The checks a) b) listed below are then carried out, and if the update is valid, it is loaded into the recorder’s data base and an ACK is returned. If the update is not valid, the buffer content is discarded and a NAK is returned.

OL

≠

OH

IL < IH c) d)

FL < FH

Linearisation type is valid for the input type.

e) Output channel is fitted f) Output channel source exists.

g) 4-digit value format selected for constant output channel h) DL < DH i) Output channel constant

≥

0

2) Further checks are carried out as a background task. This means that an ‘ACK’ may be returned, as described above, even if one of these checks (listed below) fails, causing the channel not to measure. It is recommended therefore, that a read of channel status (ST -ref. table 3.4.1) is made, 10 seconds (minimum) after an EC has been written, to establish that all the checks have passed. The background checks are as follows:

Linearisation limits are not exceeded .

External cold-junction lies within the linearisation limits.

Maximum input range is not exceeded.

HA246958



3.4.1 CHANNEL MNEMONICS (Cont.)

Input channels

Mnemonic Format

CF Hex

CJ

EU

Page 20

Hex

Hex

Bits

0

1

2

3

4 & 5

6 & 7

8 to 11

12 & 13

14 & 15

0 TO 15

0 to 3

4 to 7

8 to 11

12 to 15

Definition Permission wrt host

CHANNEL FLAGS

SCALE PRINT FLAG ........................................................................... R/W

Select: Sets scale type A off (0) or automatic (1)

Poll: 0 = Scale type A off; 1 = Auto or customised

Not used

TRACE SKIP FLAG .............................................................................. R/W

Select: 0 = Trace on; 1 = Trace off

Poll: 0 = Trace on or conditional; 1 = Trace off

INTERPOLATION ENABLE (1 = on; 0 = off) .................................... R/W

Not used

COLD JUNCTION TYPE ..................................................................... R/W

0 = Off

For software versions prior to 3.12, Bits 6/7 are defined as follows:

1 = Internal

0 = Off, 1 = Internal,

2 = External

2 = External (if polling, 2 = External or Remote)

3 = Remote

LINEARISATION TYPE ....................................................................... R/W

0 = Thermocouple type B

1 = Thermocouple type E

2 = Thermocouple type J

3 = Thermocouple type K

4 = Thermocouple type R

5 = Thermocouple type S

6 = Thermocouple type T

7 = Pt100 (100

Ω

platinum resistance thermometer)

8 = mV (Square root extraction)

9 = Volts / linear

A = mv (linear)

B = Input type = comms.

C = Input type = Off

D to F = User linearisation tables 1 to 3 respectively

LINEARISATION TYPE ENGINEERING UNITS ............................. R/W

0 = Degrees Celsius (˚C displayed)

1 = Degrees Fahrenheit (˚F displayed)

2 = Kelvins (K displayed)

3 = Rankine (R displayed)

Not used

COLD JUNCTION TEMPERATURE

CONTROL TEMPERATURE ............................................................... R/W

Integer 0 to 999 (Hex 0000 to 03E7)

ENGINEERING UNITS AND PRINT ZONE

PRINT ZONE A Integer 0 to 9. When polled, returns 0.

0 = 0 to 100% 5 = 50 to 100%

Software version 3.17 onwards.

1 = 0 to 75%

2 = 25 to 100%

6 = 0 to 25%

7 = 25 to 50%

Should the print area be more than 1% different from any of these zone limits, zone 0 is returned.

3 = 0 to 50%

4 = 25 to 75%

8 = 50 to 75%

9 = 75 to 100%

E.G. 24 to 76% would be returned as zone 4, but 23 to

76% would be returned as zone 0.

INPUT SIGNAL UNITS ....................................................................... R/W

Select: Ignored

Poll: Returns 0

SCALE UNITS ...................................................................................... R/W

Ignored unless value is hex C, in which case the units string is cleared. Always returns 0.

Not used. Always returns 8

Table 3.4.1a Input channel mnemonics (sheet 1)

HA246958

Issue 14 Mar 02



Mnemonic

FH

FL

IH

IL

LG

LN

MV*

NA

OH

OL

PV*

SA

SH

ST

Format

Decimal

Decimal

Decimal

Decimal

Character

Hex

Hex

Hex

Decimal

Decimal

Decimal

Hex

Hex

Hex

Bits

N/A

N/A

N/A

N/A

N/A

0 to 15

0 to 15

N/A

N/A

N/A

0 to 15

0 to 15

0 to 15


FUNCTION HIGH VALUE ................................................................... R/W

FUNCTION LOW VALUE ................................................................... R/W

INPUT HIGH VALUE ........................................................................... R/W

INPUT LOW VALUE ............................................................................ R/W

CHANNEL LEGEND ............................................................................ R/W

18–character string = 1st 18 characters of channel descriptor.

When selected, original characters 19 and 20 left unchanged;

When polled, characters 19 and 20 are truncated.

LEGEND NUMBER .............................................................................. R/W

Two digit number 0 to 99 (decimal) written to the last two characters of the descriptor.

Numbers greater than 99 give two spaces. When polled, returns zero if final two characters are non-numeric.

MEASURED VALUE ............................................................................ R/W

Integer F99A to 4665 (-10 to +110% of span)

0000 = Scale zero

3FFF = Full scale

A000 = Invalid data

9FFF = Over range data

A001 = Under range data

NUMBER OF ALARMS ................................................................... Read only

Always returns 4

SCALE HIGH VALUE AND CHART SPAN HIGH ............................ R/W

SCALE LOW VALUE AND CHART SPAN LOW .............................. R/W

PROCESS VARIABLE .......................................................................... R/W

Measured value scaled in engineering units.

Poll: -9999. = Under range or invalid

9999. = Over range

Select: Values outside the current range by more than 10% which are sent to the recorder are represented as being over or under range as appropriate.

SPAN ADJUST POINT ......................................................................... R/W

Select: ignored; Poll: always returns 3FFF

SHUNT VALUE ..................................................................................... R/W

Shunt value in Ohms between 1 and 65535 (Hex 0001 to FFFF)

Values > 65535 = 0

CHANNEL STATUS ......................................................................... Read only

0 = Configured and measuring analogue input

1 = Configured and reading comms input

2 = Channel off

5 = Input hardware capabilities exceeded

9 = Channel under range

A = Channel over range

B = Channel invalid

3, 4, 6, 7, 8 and C to F not used

* MV and PV may be written-to only when linearisation type (CF bits 8 to 11) is set to COMMS

Table 3.4.1a (cont.) Input channel mnemonics (sheet 2)

HA246958




Output channels

Mnemonic Format

CF Hex

DH

DL

EU

LG

LN

MV

Decimal

Decimal

Hex

Character

Hex

Hex

Bits

0

1

2

3

4 to 13

14 & 15

N/A

N/A

0 to 3

4 to 11

12 to 15

0 to 15

0 to 15


CHANNEL FLAGS


Select: Set scale type A to off (=0) or Automatic (=1)

Poll: 0 = Scale type A off; 1 = Automatic or customised

Not used


Select: 0 = trace on; 1 = trace off

Poll: 0 = trace on or conditional; 1 = trace off


Not used. Always return 0

OUTPUT TYPE ..................................................................................... R/W

0 = Off; 1 = Voltage o/p; 2 = Current o/p

OUTPUT LOW LIMIT (in engineering units) ...................................... R/W

For constant channel, also sets chart span low to this value

OUTPUT HIGH LIMIT (in engineering units) ..................................... R/W

For constant channel, also sets chart span high to this value

PRINT ZONE

Selects print zone A Integer 0 to 9. When polled, returns 0.

0 = 0 to 100%

1 = 0 to 75%

2 = 25 to 100%

3 = 0 to 50%

4 = 25 to 75%

Not used.

5 = 50 to 100%

6 = 0 to 25%

7 = 25 to 50%

8 = 50 to 75%

9 = 75 to 100%

Should the print area be more than 1% different from any of these zone limits, zone 0 is returned.


76% would be returned as zone 0.


LEGEND STRING ................................................................................ R/W

18-character string mapped onto the first 18 characters of the channel descriptor. When selected, the last two characters of the descriptor remain unchanged. When polled they are removed.

LEGEND NUMBER .............................................................................. R/W

When selected,a two digit number 0 to 99 (decimal) written to the

last two characters of the descriptor.


MEASURED OUTPUT VALUE ...................................................... Read only


0000 = Scale zero

3FFF = Full scale

A000 = Invalid data



Table 3.4.1b Output channel mnemonics (sheet 1)

Page 22

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Issue 14 Mar 02



Mnemonic

NA

OC

OF

OH

OL

OS

PV

SA

ST

ZA

Format

Hex

Decimal

Decimal

Decimal

Decimal

Hex

Decimal

Hex

Hex

Hex

Bits

N/A

N/A

N/A

N/A

0 & 1

2 to 8

9 to 12



Always returns 4

CONSTANT OUTPUT VALUE (in engineering units) ....................... R/W

OFFSET VALUE ................................................................................... R/W

SOURCE SPAN HIGH VALUE (in engineering units) ........................ R/W

Also sets chart span high to the same value.

Ignored and returns 0 for constant channels.

SOURCE SPAN LOW VALUE (in engineering units) ......................... R/W

Also sets chart span low to the same value.

Ignored and returns 0 for constant channels.

OUTPUT SOURCE CONFIGURATION

SOURCE TYPE. .................................................................................... R/W

0 = Input channel; 1 = Derived channel; 2 = Constant

SOURCE CHANNEL NUMBER .......................................................... R/W

Integer 1 to 96 (Hex 0001 TO 0060)

Ignored and returns 0 if Constant.

OUTPUT CHANNEL DECIMAL PLACE ........................................... R/W

0 to F valid for source channel. Only 0 to 4 valid for constant

0 = XXXXX.

1 = XXXX.X

2 = XXX.XX

3 = XX.XXX

4 = X.XXXX 8 = XXXXX.XXX C = Scientific

5 = XXXXXXXX. 9 = XXXX.XXXX D = Time

6 = XXXXXXX.X A = XXX.XXXXX E = Date

7 = XXXXXX.XX B = XX.XXXXXX F = Elapsed time

13 & 14

15

N/A

0 to 15

0 to 15

ERROR DRIVE ..................................................................................... R/W

0 = Drive off; 1 = Drive high; 2 = Drive low

Not used

PROCESS VARIABLE (OUTPUT VALUE) .................................... Read only

Measured output value scaled in engineering units.


9999. = Over range

SPAN ADJUST POINT ......................................................................... R/W

Ignored; Always returns 3FFF


0 = Configured and operating analogue output

2 = Channel off

5 = Output hardware capabilities exceeded

9 = Under range

A = Over range

1, 3, 4, 6 to 8 and B to F not used.

ZERO ADJUST POINT ......................................................................... R/W

Ignored; Always returns 0 0 to 15

Table 3.4.1b (cont.) Output channel mnemonics (sheet 2)

HA246958




Derived channels

Mnemonic Format

CF Hex

Bits

EU

LN

MV

NA

OH

OL

PV*

ST

Hex

Hex

Hex

Hex

Decimal

Decimal

Decimal

Hex

0

1

2

3

4 to 15

0 to 3

4 to 7

8 to 11

12 to 15

0 to 15

0 to 15

N/A

N/A

N/A

0 to 15


CHANNEL FLAGS


Select: Set scale type A to off (=0) or Automatic (=1)

Poll: 0 = Scale type A off; 1 = Automatic or customised

LEGEND PRINT ENABLE FLAG ....................................................... R/W

Select: ignored

Poll: Scale type is off (=0) or Automatic or customised (=1)


Select: 0 = trace on; 1 = trace off

Poll: 0 = trace on or conditional; 1 = trace off


Not used

ENGINEERING UNITS AND PRINT ZONE

PRINT ZONE A Integer 0 to 9. When polled, returns 0.

0 = 0 to 100%

1 = 0 to 75%

5 = 50 to 100%

6 = 0 to 25%

Software version 3.17 onwards.

Should the print area be more than 1% different from

2 = 25 to 100%

3 = 0 to 50%

7 = 25 to 50%

8 = 50 to 75% any of these zone limits, zone 0 is returned.


4 = 25 to 75%

Not used

9 = 75 to 100% 76% would be returned as zone 0.

CHANNEL ENGINEERING UNITS .................................................... R/W

Ignored unless value is hex C, in which case the units string is cleared. Always returns 0.


LEGEND NUMBER .............................................................................. R/W

Two digit number 0 to 99 (decimal) written to the last two characters of the descriptor.


MEASURED VALUE ............................................................................ R/W


0000 = Scale zero

3FFF = Full scale

A000 = Invalid data




Always returns 4

SCALE HIGH VALUE AND CHART SPAN HIGH ............................ R/W

SCALE LOW VALUE AND CHART SPAN LOW .............................. R/W

PROCESS VARIABLE ...................................................................... Read only

Measured value scaled in engineering units.


9999. = Over range


2 = Channel off

7 = Configured and recording derived function

8 = Derived function becoming erroneous in real time

0, 1, 3 to 6 and 9 to F not used.

Table 3.4.1c Derived channel parameters

Page 24

HA246958

Issue 14 Mar 02


3.4.2 Alarm mnemonics

NOTES...

1. Alarm parameters are accessible only with a logical unit address (U) of zero.

2. Before a new alarm can be set-up a “get alarm” mnemonic (GA) must be transmitted. Refer to section

3.5.11 for GA definition.

3. After all the data for the alarm has been set-up, an “enter alarm” mnemonic (EA) must be transmitted to cause the data to be written into the recorder’s data base.

4. When an EA is received the checks listed below are carried out, and if the update is valid, the data is loaded into the recorder’s data base and an ACK is returned. If the update is not valid, the buffer content is discarded and a NAK is returned.

5. In order to access current alarms, a ‘get alarm’ command (GA) must be transmitted in order to copy the relevant alarm’s parameters into the alarm buffer. Refer to section 3.5.11 for GA definition. After any update to the alarm an EA must be transmitted, to write the new data to the recorder’s data base

6. When using inverted scales it is important to note that the alarm sense (e.g. rising or falling) is related to the input signal, but the alarm setpoints are related to the scale.

ALARM BUFFER VALIDATION CHECKS.

a) Deviation out alarms Hysteresis < twice deviation value

HA246958



3.4.2 ALARM MNEMONICS (Cont.)

Mnemonic

A1

A2

A3

A4

Format

Hex

Hex

Hex

Hex

Bits

0 to 7

8 to 9

10 to 14

0

1

2 to 7

8

9

10

11 to 13

14 to 15

0 to 15

0 to 15


ALARM PACKET 1

Not used; always return 0 ..................................................................... R/W

ALARM TYPE ...................................................................................... R/W

0 = Not used

1 = Absolute

2 = Deviation

3 = Rate-of-change

HYSTERESIS (Absolute and deviation alarms only) ........................... R/W

(Fixed point 0.0 to 9.5% span)

{Bit 14 is a binary fraction (logic 1

≡

1/2)}

ALARM PACKET 2

SKIP FLAG ............................................................................................ R/W

Poll: 0 = Alarm latched, unlatched or process;

1 = Alarm off

SENSE FLAG ........................................................................................ R/W

For absolute alarms, 1 = high; 0 = low

For deviation alarms, 1 = in; 0 = out

For rate-of-change alarms, 1 = rise; 0 = fall

Not used - always return 0 when polled ................................................ R./W

ALARM FLAG (1 = alarm; 0 = no alarm) ........................................ Read only

ACKNOWLEDGE FLAG ................................................................. Read only

0 = not acknowledged; 1 = acknowledged

NEEDS ACKNOWLEDGE FLAG ................................................... Read only

0 = Does not need acknowledgement;

1 = Needs acknowledgement

RATE-OF-CHANGE ALARM PERIOD .............................................. R/W

0 = 1 second 4 = 10 minutes

1 = 10 seconds

2 = 30 seconds

5 = 30 minutes

6 = 1 hour

3 = 1 minute

Not used - always return 0 when polled ................................................ R/W

ALARM PACKET 3 (Absolute and Deviation alarms only)

SET POINT as a proportion of channel scale ........................................ R/W

Scale low = 0000; scale high = 3FFF

ALARM PACKET 4 (Deviation and Rate-of-change alarms)

DEVIATION VALUE OR CHANGE VALUE ...................................... R/W

(as a proportion of channel scale)

0000 =0.0; 3FFF = |Scale high - Scale low|

Table 3.4.2 Alarm mnemonics

Note: Because the setpoint is a proportion of full scale, any change in scale will result in a change in the absolute value of any setpoints, deviation values or rates-of-change set up in A3 and A4 above

Page 26

HA246958

Issue 14 Mar 02


3.4.3 Instrument mnemonics

DY

ER

Notes

1. Access to instrument parameters may be gained only through the use of logical unit address 0

2. A valid (0 to F) channel address must be present, even though it is not used when accessing instrument parameters.

Bits Mnemonic Format

BN Character

CD

CE

CS

Character

Character

Hex

Hex

Hex

0 to 7

8 to 15

0 to 15

0 to 15


Poll: First eight characters of operator message 1. ................................ R/W

Select: Sends eight characters (pads with spaces)

Not used - returns eight strings of 18 spaces each ................................. R/W

Not used - returns 13 strings of five spaces ........................................... R/W

CHART SPEED

Chart speed A. Integer 0 to B ................................................................ R/W

Chart speed B. Integer 0 to B ................................................................ R/W

Integer

0

1

2

3

4

5

6

7

8

9

A

B mm/hr

Off

5

10

20

30

60

120

300

600

1200

1500

User

2

4

6

10

25 in/hr

Off

0.25

0.5

1

50

5

User

DAY NUMBER

Integer 1 to 31 (Hex 0001 to 001F) ....................................................... R./W

COMMS ERROR STATUS

(Cleared by reading. ER holds only the last comms. error code.)

Integer 0 to 43 (Hex 0 to 2B) ............................................................. Read only

00 No error

01 Invalid mnemonic

02 Checksum error

03 Read attempted on write-only parameter

04 Write attempted on read-only parameter

05 Invalid unit/channel address combination

06 No free alarms available

07 Access attempted on invalid alarm record.

08 Invalid alarm number for this channel.

09 Printer buffer not empty

0A Invalid time parameter

0B Invalid instrument ID string length.

0C Invalid batch number string length.

0D Invalid channel parameter buffer

0E Invalid channel descriptor string length.

0F Invalid channel engineering units string length

Table 3.4.3a Instrument mnemonics (sheet 1)

HA246958



3.4.3 INSTRUMENT MNEMONICS (Cont.)

Mnemonic

ER

HR

ID

IF

II

IS

L1 to L3

Format

Hex

Hex

Character

Hex

Hex

Hex

Character

Bits

0 to 15

0

1

2

3

4 to 15

0 to 15

0

1

2 to 15


COMMS ERROR STATUS (Cont.)

10 Program mode active - cannot disable

11 Print line too long

12 Invalid colour select code

13 Linearisation table too long

14 Linearisation table too short

15 Invalid slot configuration string length

16 Invalid slot configuration

17 Invalid print mode

18 Invalid paper divisions

19 Invalid chart speed parameter

1A Invalid log interval - mode 2

1B Invalid log interval - mode 3

1C Parity error

1D Receive overrun error

1E Framing error

1F Invalid data format

20 Channel number out of range

21 Alarm number out of range

22 Channel not configured for external input

23 Data base update pending

24 Protected area of RAM is not write enabled

25 Printer off line

26 Printer on line

27 Printer busy

28 No log in mode 1

2A No resettable channels

2B Input not defined for current function

HOURS .................................................................................................. R/W

Integer 0 to 23 (Hex 0000 to 0017)

INSTRUMENT DESCRIPTOR ............................................................. R/W

Not used - always returns 24 spaces if polled

INSTRUMENT FLAGS

Not used - always returns 0 if polled

CURRENT CHART SPEED FLAG (Ref. CS) ...................................... R/W

0 = Speed A; 1 = Speed B

CHART SPEED UNITS FLAG (0 = mm/hr; 1 = in/hr) ....................... R/W

DATE FORMAT (0 = dd/mm/yy; 1 = mm/dd/yy) ................................. R/W

Not used - always return 0 when polled ................................................ R/W

INSTRUMENT IDENTIFIER ........................................................... Read only

Always returns >4001

INSTRUMENT STATUS

INSTRUMENT ALARM FLAG (1 = active) .................................... Read only

PRINTER ON/OFF LINE (1 = Off; 0 = On) ..................................... Read only

Not used - always return 0 ................................................................. Read only

LINEARISATION TABLES .................................................................. R/W

Not used. Return ‘Empty’ when polled.

Table 3.4.3a (Cont.) Instrument mnemonics (sheet 2)

Page 28

HA246958

Issue 14 Mar 02



Mnemonic

MI

MO

(Not M 0 )

M2

M3

PM

PT

RJ

SC

SE

T0

(T zero)

Format

Hex

Hex

Hex

Hex

Hex

Character

Hex

Character

Hex

Hex

Bits

0 to 15

0 to 15

0 to 15

0 to 15

0 to 1

2 to 15

0

1 to 15


MINUTES

Integer 0 to 59 (Hex 0000 to 003B) ....................................................... R/W

MONTH

Integer 0 to 12 (Hex 0000 to 000C) ....................................................... R/W

MODE 2 LOG INTERVAL (0 = Off) .................................................... R/W

Interval in minutes between timed logs (log interval A)

Integer 0 to 6039 (Hex 0000 to 1797)

MODE 3 LOG INTERVAL (0 = Off) .................................................... R/W

Integer 0 to 36234 (Hex 0000 to 8D8A)

Poll: Log interval A in 10s of seconds

Select: Truncates to a multiple of minutes

PRINT MODE ........................................................................................ R/W

Print mode (1 = trend; 2 = Text; 3 = Text only)

Not used - always return 0 when polled.

TEXT TO BE PRINTED .................................................................. Write only

Up to 100 printable characters printed in black.

Colour underlining is possible using ‘!n’ embedded in the text string, to select colour n (see table below). Up to 10 colour selections can be embedded in one string.

USE OF THE EXCLAMATION MARK (!) IS NOT ALLOWED IN

A TEXT STRING EXCEPT TO DEFINE THE UNDERLINE COL-

OUR n Underline colour n Underline colour

1

2

3

Red

Orange

Green

4

5

6

Purple

Blue

None

REMOTE CJ (Software versions 3.12 onwards) ................................... R/W

REMOTE CJ MODE

0 = Single remote CJ used for all channels (see 'T0' below)

1 = Remote CJ channel for each input board (see 'T1 to TC' below)

Not used

0 to 15

0

1 to 2

3

4 to 10

11 to 15

SLOT CONFIGURATION ................................................................ Read only

When polled, gives the type of board fitted at each address as:

0 (8 or 16 channel input), 6 (Relay output), D (8-channel output),

E (4-channel output) or F (Empty)

Byte 1 contains the type for address 1; byte 2 the type for address 2 etc. Byte 8 always returns ‘F’ (Empty)

SECONDS

Integer 0 to 59 (Hex 0000 to 003B) ................................................... Read only

MAY NOT BE WRITTEN TO

SINGLE REMOTE CJ CONFIG (Software versions 3.12 onwards) ... R/W

Used only when RJ above is set to 0

REMOTE CJ ENABLE

0 = Disable remote CJ channel

1 = Enable remote CJ channel

REMOTE CJ UNITS

0 = Degrees Celsius 1 = Degrees Fahrenheit

2 = Kelvins 3 = Rankine

CHANNEL TYPE

0 Input channel; 1 = Derived channel

REMOTE CJ CHANNEL ADDRESS

See table 3.4.3b

Not used


HA246958




Mnemonic

T1 to TC

VN

XE

XT

YR

Format

Hex

Character

Hex

Hex

Hex

Bits

0 to 15

0 to 3

0 to 1

2 to 15

0 to 15


MULTIPLE REMOTE CJ CONFIG (S/W versions 3.12 onwards) ..... R/W

Used only when RJ above is set to 1

Note Tn = Remote CJ config. for input board with address n where n = 1 to C for 250mm recorders n = 1 to 6 for 180mm multipoint recorders n = 1 to 4 for 180/250 mm continuous recorders.

As for T0 above

VERSION NUMBER OF EMULATED 4001 SOFTWARE ............ Read only

Returns:

7.1LE0 (no maths pack)

7.1LE2 (Maths pack level 1 fitted)

7.1LE3 (Maths pack level 2 fitted)

XMODEM ERROR REPORTING .................................................... Read only

0 Transfer OK, no errors

1 Restore failed completely. File incompatible or comms transfer failure. Previous configuration unaffected.

2 Restore failed on data. Some records ignored, but restore operation mostly successful.

3 Restore failed on transfer - new configuration undefined.

16 Save operation had no reply from comms and timed out

32 Save operation failed before transfer was completed.

ENTER XMODEM MODE .............................................................. Write only

0 = as standby; 1 = as receiver; 2 = as sender

Not used

YEAR ..................................................................................................... R/W

Offset from year 1900

Integer 88 to 188 (Hex 0058 to 00BC)


All recorders

00 Reserved

01 = Channel 1

02 = Channel 2

03 = Channel 3

04 = Channel 4

05 = Channel 5

06 = Channel 6

07 = Channel 7

08 = Channel 8

09 = Channel 9

0A = Channel 10

0B = Channel 11

0C = Channel 12

0D = Channel 13

0E = Channel 14

0F = Channel 15

10 = Channel 16

11 = Channel 17

12 = Channel 18

13 = Channel 19

14 = Channel 20

15 = Channel 21

16 = Channel 22

17 = Channel 23

18 = Channel 24

19 = Channel 25

1A = Channel 26

1B = Channel 27

1C = Channel 28

1D = Channel 29

1E = Channel 30

1F = Channel 31

20 = Channel 32

21 = Channel 33

22 = Channel 34

23 = Channel 35

24 = Channel 36

25 = Channel 37

26 = Channel 38

27 = Channel 39

28 = Channel 40

29 = Channel 41

2A = Channel 42

2B = Channel 43

2C = Channel 44

2D = Channel 45

2E = Channel 46

2F = Channel 47

30 = Channel 48

Input channel addresses

Multipoint recorders only

250 mm multipoint recorders only

31 = Channel 49

32 = Channel 50

33 = Channel 51

34 = Channel 52

35 = Channel 53

36 = Channel 54

37 = Channel 55

38 = Channel 56

39 = Channel 57

3A = Channel 58

3B = Channel 59

3C = Channel 60

3D = Channel 61

3E = Channel 62

3F = Channel 63

40 = Channel 64

41 = Channel 65

42 = Channel 66

43 = Channel 67

44 = Channel 68

45 = Channel 69

46 = Channel 70

47 = Channel 71

48 = Channel 72

49 = Channel 73

4A = Channel 74

4B = Channel 75

4C = Channel 76

4D = Channel 77

4E = Channel 78

4F = Channel 79

50 = Channel 80

51 = Channel 81

52 = Channel 82

53 = Channel 83

54 = Channel 84

55 = Channel 85

56 = Channel 86

57 = Channel 87

58 = Channel 88

59 = Channel 89

5A = Channel 90

5B = Channel 91

5C = Channel 92

5D = Channel 93

5E = Channel 94

5F = Channel 95

60 = Channel 96

Table 3.4.3b Remote CJ Channel addressing (Mnemonics T0 and T1 to TC - table 3.4.3a)

Page 30

HA246958

Issue 14 Mar 02


3.5 COMMAND MNEMONICS

There are a number of mnemonics that do not directly access parameters, but which cause the serial link to perform some action. These mnemonics are write-only i.e. they must be sent as a selection message and cannot be polled.

3.5.1 Alarm acknowledge (AA)

On receipt of this mnemonic, all alarms requiring acknowledgement are acknowledged.

3.5.2 Printer on (CG)

If the printer is off line receipt of this mnemonic will turn it on and return an ACK. If the printer is already on, a NAK is returned.

3.5.3 Chart halt (CH)

No action taken. Always returns ACK

3.5.4 Printer off (CO)

If the printer is on-line, then receipt of this mnemonic causes the it to be switched off-line and an ACK is returned. If the printer is already off, a NAK is returned.

3.5.5 Chart Wind (CW)

Receipt of this command whilst the printer is off-line, causes the chart to wind forward 16 cm. at maximum speed.

CW commands received whilst the printer is on-line return a NAK.

3.5.6 Data Dump (DD)

If the printer is on-line, then receipt of this command causes log1 to be printed on the chart and an ACK to be returned. If the printer is off-line then no action is taken and a NAK is returned.

3.5.7 Disable program mode (DP)

If the recorder is not in configuration mode, then the sending of ‘DP’ causes entry to the configuration mode to be inhibited and an ACK to be returned. If the recorder is in configuration mode, then no action is taken and a NAK is returned. Should the operator attempt to enter configuration, when it has thus been disabled, the message “Configuration access disabled by comms” will appear.

3.5.8 Enter alarm data (EA)

When alarm data is being written to the recorder, the new data is held in a temporary storage area (buffer), which is reinitialised each time new alarm data is entered. On receipt of the ‘EA’ mnemonic, the data in the buffer is checked, and if valid, it is written to the recorder’s data base and an ACK is returned. If the data is not valid, then the buffer content is discarded and a NAK is returned.

3.5.9 Enter channel data (EC)

When channel parameters are being written to (selected), the new data is held in a temporary storage area (buffer), which is re-initialised each time a new channel is written to. On receipt of the ‘EC’ mnemonic, the data in the buffer is checked, and if valid, it is written to the recorder’s data base and an ACK is returned. If the data is not valid, then the buffer content is discarded and a NAK is returned.

3.5.10 Enable program mode (EP)

The sending of ‘EP’ causes the configuration menu to be enabled regardless of its existing state. ACK is always returned.

HA246958



3.5.11 Get indicated alarm data (GA)

Allows the channel number and alarm number required to be defined, as follows:

NO MATHS PACK FITTED

Bits

0 to 5

Definition

Alarm number (integer 1 to 4)

6 to 7 Not used

8 to 15 Channel number

Integer 1 to 30 (Hex 0001 to 001E) = channels 1 to 30 respectively

Integer 63 to 131 (Hex 003F to 0083) = channels 31 to 99 respectively

MATHS PACK FITTED

Bits

0 to 5

Definition

Alarm number (integer 1 to 4)

6 to 7 Not used

8 to 15 Channel number

Integer 1 to 30 (Hex 0001 to 001E) = Measuring channels 1 to 30 respectively

Integer 31 to 62 (Hex 001F to 003E) = Derived channels 1 to 32 respectively

Integer 63 to 131 (Hex 003F to 0083) = Measuring channels 31 to 99 respectively

Integer 132 to 198 (Hex 0084 to 00C6) = Derived channels 33 to 99 respectively

3.5.12 Get free alarm (GF)

Implemented only on model 4001

3.5.13 Chart rewind (CR)

Implemented only on model 4001

Page 32

HA246958

Issue 14 Mar 02


3.6 PARAMETER SCROLLING

This is a feature which allows a number of parameters to be read one after the other on receipt of an ACK after each poll. The parameters are divided into two types: Block Command and Scroll List.

3.6.1 Block parameters

If the previous command parameter was a Block Command Parameter, the recorder automatically increments the channel address within the logical unit, and transmits the value of the same mnemonic as last time, but for the new channel. The channel address is continuously incremented until it reaches its maximum value for the particular LU / CA entry combination, and is then reset to the minimum, and so on, as follows:

LU CA sequence LU CA sequence

1 0, 1, 2, 3, 0, 1, 2, ....

1 4, 5, 6, 4, 5, 6, ....

1 7, 8, 9, A, B, C, D, E, F, 7, 8, 9,....

8 0, 1, 0, 1, 0.......

8 2, 3, 4, 5, 6, 2, 3, 4,....

9 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, ......

2 0, 1, 2, 3, 0, 1, 2, ....

2 4, 5, 6, 4, 5, 6, ....

9 8, 9, A, B, C, D, E, F, 8, 9, A, ....

A 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, ....

2 7, 8, 9, A, B, C, D, E, F, 7, 8, 9, .... A 8, 9, A, B, C, D, E, F, 8, 9, A, ....

3 0, 1, 2, 3, 0, 1, 2, .... B 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, ....

3 4, 5, 6, 4, 5, 6, .... B 8, 9, A, B, C, D, E, F, 8, 9, A, ....

3 7, 8, 9, A, B, C, D, E, F, 7, 8, 9, .... C 0, 1, 2, 3, 4, 5, 0, 1, 2, ....

4 0, 1, 2, 3, 0, 1, 2, ....

4 4, 5, 6, 4, 5, 6, ....

C

C

6, 7, 6, 7, 6, .....

8, 9, A, B, C, D, E, F, 8, 9, A, ....

4 7, 8, 9, A, B, C, D, E, F, 7, 8, 9, .... D 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, ....

5 0, 1, 2, 3, 0, 1, 2, .... D 8, 9, A, B, C, D, E, F, 8, 9, A, ....

5 4, 5, 6, 4, 5, 6, .... E 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, ....

5 7, 8, 9, A, B, C, D, E, F, 7, 8, 9, .... E 8, 9, A, 8, 9, A, ....

6 0, 1, 2, 3, 0, 1, 2, ....

6 4, 5, 6, 4, 5, 6, ....

F 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, ....

7 0, 1, 2, 3, 0, 1, 2, ....

7 4, 5, 6, 4, 5, 6, ....

Table 3.6.1 Block parameter scroll sequences

3.6.2 Scroll parameters

Alarm and Instrument parameters are all scroll parameters. This means that when an ACK is received, the next parameter in the lists below is accessed.

ALARM PARAMETERS

The alarms are scrolled in order A1, A2, A3, A4, ,A1, A2 —etc

INSTRUMENT PARAMETERS

The instrument parameters are scrolled in order:

SC, IF, PM, PD * , IS, ER, HR, MI, SE, DY, MO, YR, BN, CD*, CE*, II, VN, ID, CS, M2, M3, L1 to L3, J1 * to J5 * ,

RJ † , T0 † , T1 † to Tn † , SC, IF, ... , etc.

* These parameters are not emulated by the recorder. If selected, they are ignored, if polled, they return zero.

† These parameters appear only with software versions 3.12 onwards.

In 'Tn' n = Hex C for 250mm multipoint recorders, n = 6 for 180mm recorders and n = 4 for continuous recorders.

HA246958



3.7 CHARACTER SET

CHARACTER

NUL

SOH (Start of heading)

STX (Start of text) *

ETX (End of text) *

EOT (End of transmission) *

BEL (Bell)

BS (Backspace)

CONTROL

KEY

I

J

E

F

G

H

A

B

C

D

K

L

M

N

O

BINARY

CODE

000 0000

000 0001

000 0010

000 0011

000 0100

000 0101

000 0110

000 0111

000 1000

000 1001

000 1010

000 1011

000 1100

000 1101

000 1101

000 1111

HEX

CODE

04

05

06

07

00

01

02

03

08

09

0A

0B

0C

0D

0E

0F

DECIMAL

CODE

DLE (Data link escape)

DC1 {Device control 1 (XON)} *

DC2 (Device control 2)

DC3 {Device control 3 (XOFF)} *

DC4 {Device control 4 (stop)}

NAK (Negative acknowledge) *

ETB (End of transmission block)

CAN (Cancel)

EM (End of medium)

SUB (Substitute)

ESC (Escape)

T

U

V

W

P

Q

R

S

X

Y

Z

001 0000

001 0001

001 0010

001 0011

001 0100

001 0101

001 0110

001 0111

001 1000

001 1001

001 1010

001 1011

001 1100

001 1101

001 1110

001 1111

18

19

1A

1B

1C

1D

1E

1F

14

15

16

17

10

11

12

13

24

25

26

27

28

29

30

31

20

21

22

23

16

17

18

19

(Space)

#

$

(Hash) (£ sign - ISO 7)

{Dollar (or £ sign)}

(

)

& (Ampersand)

` (Closing single quote)

(Opening round bracket)

(Closing round bracket)

* (Asterisk)

, (Comma)

. {Full stop (period)}

/ (Oblique)

010 0000

010 0001

010 0010

010 0011

010 0100

010 0101

010 0110

010 0111

010 1000

010 1001

010 1010

010 1011

010 1100

010 1101

001 1110

010 1111

2C

2D

2E

2F

28

29

2A

2B

24

25

26

27

20

21

22

23

36

37

38

39

40

32

33

34

35

41

42

43

44

45

46

47

* Only those control characters marked with an asterisk are correctly interpreted by the instrument. The use of other control codes may lead to unrecoverable errors.

Table 3.7 Character set: Sheet 1 Hex 00 to 2F

Page 34

HA246958

Issue 14 Mar 02


3.7 CHARACTER SET (Cont.)

6

7

4

5

0

1

2

3

8

9

: (colon)

; semi-colon)

= (equals)

CHARACTER

I

J

K

L

E

F

G

H

M

N

O

@

A

B

C

D

T

U

V

W

P

Q

R

S

Z

[

X

Y

]

(opening square bracket)

(closing square bracket)

^ (circumflex)

_ (Underline)

101 0000

101 0001

101 0010

101 0011

101 0100

101 0101

101 0110

101 0111

101 1000

101 1001

101 1010

101 1011

101 1100

101 1101

101 1110

101 1111

Table 3.7 (cont.) Sheet 2: Hex 30 to 5F

100 0000

100 0001

100 0010

100 0011

100 0100

100 0101

100 0110

100 0111

100 1000

100 1001

100 1010

100 1011

100 1100

100 1101

100 1110

100 1111

BINARY

CODE

011 0000

011 0001

011 0010

011 0011

011 0100

011 0101

011 0110

011 0111

011 1000

011 1001

011 1010

011 1011

011 1100

011 1101

011 1110

011 1111

91

92

93

94

95

87

88

89

90

80

81

82

83

84

85

86

74

75

76

77

78

79

70

71

72

73

64

65

66

67

68

69

DECIMAL

CODE

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

5B

5C

5D

5E

5F

57

58

59

5A

50

51

52

53

54

55

56

4A

4B

4C

4D

4E

4F

46

47

48

49

40

41

42

43

44

45

HEX

CODE

30

31

32

33

34

35

36

37

38

39

3A

3B

3C

3D

3E

3F

HA246958



3.7 CHARACTER SET (Cont.) g h f e i j k c d a b n o l m

CHARACTER z

{ x y v w r s t u p q

}

(opening curly bracket)

(closing curly bracket)

~ (tilde)

Not printed

111 0000

111 0001

111 0010

111 0011

111 0100

111 0101

111 0110

111 0111

111 1000

111 1001

111 1010

111 1011

111 1100

111 1101

111 1110

111 1111

Table 3.7 (Cont.) Sheet 3: Hex 60 to 7F.

BINARY

CODE

110 0000

110 0001

110 0010

110 0011

110 0100

110 0101

110 0110

110 0111

110 1000

110 1001

110 1010

110 1011

110 1100

110 1101

110 1110

110 1111

HEX

CODE

6C

6D

6E

6F

68

69

6A

6B

64

65

66

67

60

61

62

63

79

7A

7B

7C

75

76

77

78

7D

7E

7F

70

71

72

73

74

DECIMAL

CODE

104

105

106

107

108

109

110

111

96

97

98

99

100

101

102

103

120

121

122

123

124

125

126

127

112

113

114

115

116

117

118

119

Page 36

HA246958

Issue 14 Mar 02



CHARACTER

ö

ü

ù

ÿ

¢

£

¥

ô

ö

ò

û

É

æ

Æ

ç

ê

à

å

ë

ï

è

ì

î

Ä

Å

é

â

ä

Ç

ü o

¿

ú

ñ

Ñ a

á

í

ó

DECIMAL

CODE

134

135

136

137

138

139

128

129

130

131

132

133

140

141

142

143

152

153

154

155

156

157

158

159

144

145

146

147

148

149

150

151

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

HEX

CODE

8B

8C

8D

8E

8F

85

86

87

88

89

8A

80

81

82

83

84

97

98

99

9A

9B

9C

9D

9E

9F

90

91

92

93

94

95

96

A7

A8

A9

AA

AB

AC

AD

AE

AF

A0

A1

A2

A3

A4

A5

A6

BINARY

CODE

1000 0000

1000 0001

1000 0010

1000 0011

1000 0100

1000 0101

1000 0110

1000 0111

1000 1000

1000 1001

1000 1010

1000 1011

1000 1100

1000 1101

1000 1110

1000 1111

1001 0000

1001 0001

1001 0010

1001 0011

1001 0100

1001 0101

1001 0110

1001 0111

1001 1000

1001 1001

1001 1010

1001 1011

1001 1100

1001 1101

1001 1110

1001 1111

1010 0000

1010 0001

1010 0010

1010 0011

1010 0100

1010 0101

1010 0110

1010 0111

1010 1000

1010 1001

1010 1010

1010 1011

1010 1100

1010 1101

1010 1110

1010 1111

Table 3.7 (Cont.) Sheet 4: Hex 80 to AF

HA246958




5

6

3

4

0

1

2

7

8

9

2

3

0

1

4

5

6

7

8

9

0

1

2

7

8

9

5

6

3

4

(Subscript)

(Subscript)

(Subscript)

(Subscript)

Not printed

Not printed

(Superscript)

(Superscript)

(Superscript)

(Superscript)

(Superscript)

(Superscript)

(Superscript)

(Superscript)

(Superscript)

(Superscript)

(Subscript)

(Subscript)

(Subscript)

(Subscript)

(Subscript)

(Subscript)

Not printed

Not printed

Not printed

Not printed

Not printed

Not printed

Not printed

Not printed

Not printed

∫

{Bell (alarm) symbol}

CHARACTER

C8

C9

CA

CB

CC

CD

CE

CF

C4

C5

C6

C7

C0

C1

C2

C3

D5

D6

D7

D8

D9

DA

DB

DC

D0

D1

D2

D3

D4

DD

DE

DF

HEX

CODE

BC

BD

BE

BF

B7

B8

B9

BA

BB

B0

B1

B2

B3

B4

B5

B6

200

201

202

203

204

205

206

207

192

193

194

195

196

197

198

199

213

214

215

216

217

218

219

220

208

209

210

211

212

221

222

223

DECIMAL

CODE

183

184

185

186

187

188

189

190

191

176

177

178

179

180

181

182

1101 0000

1101 0001

1101 0010

1101 0011

1101 0100

1101 0101

1101 0110

1101 0111

1101 1000

1101 1001

1101 1010

1101 1011

1101 1100

1101 1110

1101 1101

1101 1111

1100 0000

1100 0001

1100 0010

1100 0011

1100 0100

1100 0101

1100 0110

1100 0111

1100 1000

1100 1001

1100 1010

1100 1011

1100 1100

1100 1101

1100 1110

1100 1111

BINARY

CODE

1011 0000

1011 0001

1011 0010

1011 0011

1011 0100

1011 0101

1011 0110

1011 0111

1011 1000

1011 1001

1011 1010

1011 1011

1011 1100

1011 1101

1011 1110

1011 1111

Table 3.7 (Cont.) Sheet 5: Hex B0 to E2

Page 38

HA246958

Issue 14 Mar 02



µ

τ

Σ

σ

Γ

π

α

β

φ

θ

Ω

δ

∞

∩

≥

≤

≡

±

÷

≈

(Minus)

(Plus)

(Divide)

Not printed

CHARACTER

BINARY

CODE

1110 0000

1110 0001

1110 0010

1110 0011

1110 0100

1110 0101

1110 0110

1110 0111

1110 1000

1110 1001

1110 1010

1110 1011

1110 1100

1110 1101

1110 1110

1110 1111

1111 0000

1111 0001

1111 0010

1111 0011

1111 0100

1111 0101

1111 0110

1111 0111

1111 1000

1111 1001

1111 1010

1111 1011

1111 1100

1111 1101

1111 1110

1111 1111

HEX

CODE

E0

E1

E2

E3

E4

E5

E6

E7

E8

E9

EA

EB

EC

ED

EE

EF

F7

F8

F9

FA

F0

F1

F2

F3

F4

F5

F6

FB

FC

FD

FE

FF

DECIMAL

CODE

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

Table 3.7 (Concluded) Sheet 6: Hex E0 to FF

HA246958



3.8 APPLICATION NOTES

3.8.1 Message timing

The recorder can receive a message as a continuous byte stream (i.e. the bytes in a message may be end to end).

3.8.2 Command mnemonics

These mnemonics cause the serial link to perform some action. Command mnemonics which control the chart have the same priority as the operator (i.e. last input from either source overrides previous inputs).

3.8.3 Channel selection

It is not possible to write directly to the recorder data base because of the interdependence of parameters. For this reason, the characters are held in a buffer until an ‘EC’ command mnemonic is received.

As each parameter is received it is checked, and if it is valid, an ACK is returned and the data is stored in the buffer.

(If the data is not valid, a NAK is returned and the data is discarded.) When the EC mnemonic is received the contents of the buffer are checked, and if the data is all valid, the contents of the buffer are stored in the recorder data base, and an ACK is returned. If the data is not valid, a NAK is returned, the data is discarded and an error flag set in ‘ER’ (See Instrument Mnemonics in section 3.4.3, above).

Note: It is not possible for the user to read the buffer, either before or after the EC mnemonic.

3.8.4 Alarm selection / polling

There is a single buffer through which alarms can be accessed. The relevant alarm is read into the buffer from the data base as the result of a command mnemonic ‘GA’. This buffer can then be written to or read, via the instrument address (U = 0). When writing to the buffer, the data is stored until a command mnemonic (EA) is received, as described below.

SELECTION

As each parameter is received it is checked, and if it is valid, an ACK is returned and the data is stored in the buffer.

(If the data is not valid, a NAK is returned and the data is discarded.) When the EA mnemonic is received the contents of the buffer are checked, and if the data is all valid, the contents of the buffer are stored in the recorder data base, and an ACK is returned. If the data is not valid, a NAK is returned and the data is discarded. The alarm buffer is marked as ‘invalid’ and must be refilled before it can again be accessed. A NAK is returned if an attempt is made to read or write to the buffer before it is refilled.

3.8.5 Printed text

If text to be printed is sent via the ‘PT’ mnemonic (section 3.4.3) it is placed in the instrument’s demand message queue, and treated as a standard demand message. If there is insufficient space in the queue, a NAK is returned.

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3.8.6 Special characters

ASCII MODE

The printing control characters (table 3.1.2) may be used only as control characters (i.e. they may not be used as a part of a text string). The ASCII control characters (e.g. STX) may not be used at all in ASCII mode.

ANSI MODE

The ASCII control characters may be used only in their correct positions (i.e. they may not be used as a part of a text string).

Notes

1. The special characters shown in table 3.7 sheets 3, 4 and 5, above, require the use of eight data bits, and both the recorder and the host must be configured as such.

2. Model 4001 characters which are not available with curent recorders and vice-versa, are treated as an underline symbol (_).

3.8.7 Multi-parameter data packets

When a parameter which contains a number of different individual items (e.g. channel flags CF - see table 3.4.1) then it is not possible to change only a single item within the parameter; the whole word must be written with the required data for each bit.

When one or more bits in a multi-parameter mnemonic are READ-ONLY, or not used, those bits are ignored. No error flag is set in ‘ER’.

3.8.8 Digital input channels

These types of channel cannot be written to using this communications protocol. If an attempt is made to do so, a

NAK is returned and code 05 is set into ‘ER’.

The process value (PV) for digital channels may be polled (read), with the response 0.0 if the input is open and 1.0 if the input is closed.

The measured value (MV) for digital channels may also be polled (read), with the response 0000 if the input is open and 0001 if the input is closed.

3.8.9 Floating point overflow

Maths channel PVs, scales, alarm setpoints etc. may exceed the floating point range ( 9999) of the 4001 emulation protocol. In such a case, the value 9999 (with appropriate sign) is returned.

HA246958



4 GOULD MODICON MODBUS PROTOCOL

When connected to a host computer the recorder acts as a slave Modbus device. The unit address (1 to 247) being set up as a part of the recorder’s communications configuration. Only a limited number of function codes have been implemented (ref. Modbus protocol manual) and these are listed in section 4.3

4.1 CHANNEL ADDRESSING

The channel 1 address listed in table 4.3 is the base address at which channel 1 may be accessed.

Note: Addressing starts at zero, whilst channel numbers start at 1

Example: to read a digital input at channel 23, the required address passed with the code 01 would be 22

If an alarm is set for an input or derived channel, the associated alarm parameters can be read using code 03

Example: To read the set point of absolute alarm 1 on channel 8, the required address passed with code 03 should be

1257 (1250 = channel 1; 1251 = channel 2 etc.).

The interpretation of alarm parameters (A1 to A4 and SP1 to SP4 in table 4.3) depends on alarm type as follows:

ALARM TYPE PARAMETER

Absolute

Absolute

Deviation

Deviation

Rate

Rate

Digital

Digital

A1 to A4

SP1 to SP4

A1 to A4

SP1 to SP4

A1 to A4

SP1 to SP4

A1 to A4

SP1 to SP4

DEFINITION

Not used

Setpoint values

Deviation values

Setpoint values

Rate value

Period value (secs)

Not used

0000 = Open; FFFF = closed

Table 4.1 Alarm paramteter interpretation

Note: Any request to read a nonexistent setpoint value will result in the value 0000 being returned. This should not be taken to mean that the setpoint is at 0.000

4.2 READING ANALOGUE VALUES

4.2.1 16-bit format

The values read are in the range 0000 to FFFF. To obtain the scaled relative value, the following calculation must be carried out:

Scaled value =





High range - Low range

FFFF

x Analogue measurement





+ low range where the analogue measurement is in hex.

In the event of a hardware error or under-range value, the value is forced to scale zero. Should the analogue value be over range, the scaled value is forced to scale high.

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4.2 READING ANALOGUE VALUES (Cont.)

4.2.2 32-bit format

Values read from service code 03 addresses based at:

7250 (Analogue channel scale low value)

7750 (Analogue channel scale high value)

8250 (Derived channel scale low value)

8750 (Derived channel scale high value) and values read from service code 04 addresses based at:

1500 (Analogue channel value)

2000 (Derived channel value) are in 32-bit IEEE floating point format. Each value resides in two consecutive 16-bit registers transmitted most significant byte first. Two registers per channel must be requested, and the required address increases by two per channel number, for example:

Analogue channel 1: Code04; address 1500

Analogue channel 2: Code 04; address 1502 or generally:

Analogue channel N: code 04; address 1500 + 2(N-1)

Example 1 Read channel 05

( 0x- means the two characters following the 'x' are in hexadecimal)

<slave address><code><register addr high><register addr low><nº of registers high>

<nº of registers low><CRC high><CRC low>

Specifically, to read analogue channel 05 from slave address 2:

<0x02><0x04><0x05><0xE4><0x00><0x02><CRC high><CRC low>

To which the reply should be:

<slave address><code><byte count><most significant byte><next byte><next byte>

<least significant byte>

Specifically for channel 5 having a value of 1.123 (0x3F8FBE76 in 32-bit IEEE format)

<0x02><0x04><0x04><0x3F><0x8F><0xBE><0x76>

TOTALISER VALUES

To read a totaliser value, use the derived channel copy facility to import the totaliser value into a derived channel, and read this derived channel using service code 04 (base address 2000). The returned value will be in 32-bit IEEE float as described above.

HA246958



4.3 FUNCTION CODES

CODE

01

02

03

FUNCTION RECORDER ACTION CHANNEL 1

ADDRESS (DECIMAL)

Read coil status Digital input state (true = >0.5) ................................................ 0

Digital read input status Digital input state (true = < 0.5) ............................................... 0

I/O alarm 1 status .................................................................... 250

Read holding register

I/O alarm 2 status .................................................................... 500

I/O alarm 3 status .................................................................... 750

I/O alarm 4 status ................................................................... 1000

Derived alarm 1 status ............................................................ 1250




I/O channel value ...................................................................... 0

I/O channel A1 (Table 4.1) ...................................................... 250



I/O channel A4 (Table 4.1) ..................................................... 1000

I/O channel SP1 (Table 4.1) ................................................... 1250




Derived channel A1 (Table 4.1) ............................................. 2250

Reserved (always returns 0000) ............................................. 2500







Derived channel SP1 (Table 4.1) ........................................... 4250








I/O channel status (read only) (flags - see code 04) .............. 6250

Derived channel status (read only) (flags - see code 04) ...... 6500

Instrument status (read only) (flags - see code 07) ................ 6750

Analogue real channel scale low value (32-bit) .................... 7250

Analogue real channel scale high value (32-bit) ................... 7750

Derived channel scale low value (32-bit) .............................. 8250

Derived channel scale high value (32-bit) ............................. 8750

Table 4.3 Modbus implementation channel addresses (Sheet 1: codes 01 to 03)

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4.3 FUNCTION CODES (Cont.)

CODE

04

05

06

07

08

15

16

65

66

FUNCTION

Read input register

Force single coil

Preset single register

Read exception status

Loopback test

Force multiple coil

Preset multiple registers

Enter XMODEM mode

Report XMODEM error

RECORDER ACTION CHANNEL 1

ADDRESS (DECIMAL)

Analogue input/output value ................................................................. 0

I/O channel status ................................................................................ 250

No bits set: Channel OK

Bit 0 set:

Bit 1 set:

Bit 2 set:

Bit 3 set:

Channel off

Over range

Under range

Hardware error / bad PV

Bit 4 set:

Bit 5 set:

Ranging error / no data

Overflow

Bits 6 to 15: Always 0.

Derived channel value ......................................................................... 500

Reserved (returns 0000) ...................................................................... 750

Derived channel status ...................................................................... 1000

(Bits 0 to 15 as for I/O channel status above)

Instrument status (flags - code 7) ...................................................... 1250

Analogue real channel value (32-bit) ............................................... 1500

Derived channel value (32-bit) ......................................................... 2000

Sets digital input state for comms channel ........................................... 0

0 = 0.000; 1 = 1.000

Preset holding register .................................................................. As code 03

(Presets values for comms channels only)

(Base addresses 7250, 7750, 8250 and 8750 cannot be preset)

Read instrument status

Bit 0:

Bit 1:

System error

Writing system failure

Bit 2: Paper out (250 mm non-graphics recorders only)

Bits 3 to 7 Always 0

Diagnostic code 0 (Echoes message as sent)

Sets digital input code for comms channels in address range. ............. 0

0 = 0.000

1 = 1.000

Preset holding register for each channel in address range. .......... As code 03

(Presets values for comms channels only)

(Base addresses 7250, 7750, 8250 and 8750 cannot be preset)

Holds 1 byte of data specifying which mode to enter

0 = standby; 1 = Receiver; 2 = Sender

Returns 1 byte of data as follows:

0: Transfer OK - no errors

1: Restore failed completely

File was incompatible or comms failed

2: to transfer the file,

Original configuration unchanged.

Restore failed on data.

Some records ignored, but transfer mostly successful.

3: Restore failed on transfer

Some config. transferred before failure.

New configuration undefined

16: Save had no reply from comms and timed out

32: Save failed before transfer completed

Table 4.3 Modbus implementation channel addresses (Sheet 2)

HA246958



4.3 FUNCTION CODES (Cont.)

CODE

01

02

03

06

FUNCTION RECORDER ACTION CHANNEL 1

ADDRESS (DECIMAL)

Illegal function

Illegal data address

Illegal data

Illegal busy

EXCEPTION RESPONSES

Unsupported or illegal Modbus function .............................................. 0

Data address out of range for instrument config .................................. 0

Attempt to preset input value of non comms channel

Invalid configuration data

Data value out of range for function

Configuration transfer in progress via another port so unable to action function

Table 4.3 Modbus implementation channel addresses (Sheet 3)

5 XMODEM TRANSFER

XMODEM transfers take place between a host computer and a single instrument using MODBUS or 4001 protocol.

The transfer is used to save or restore recorder configurations. The transfer procedure is as follows

1. Place any other instruments on the communications link into standby mode.

2. Set the required recorder to sender or receiver mode as appropriate.

3. Send or receive file at host.

4. 10 seconds after completion, host communications is restored to normal use.

Notes:

1. 10 seconds of inactivity on the communications link, at any point in the procedure, will cause the host communications to return to normal use for instruments in standby mode.

2. XMODEM transfer is not possible with graphics recorders or graphics display units.

Page 46

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6 LIST OF EFFECTIVE PAGES

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HA246958



Symbols

4001 ANSI protocol

Description ................................................. 15

Selection .................................................... 14

4001 ASCII protocol

Description ................................................. 16

Selection .................................................... 14

A

Alarm mnemonics ........................................... 25

Application notes ............................................ 40

B

Baud rate setting............................................. 14

C

Channel mnemonics

Derived channels ......................................... 24

Input channels ............................................. 20

Output channels .......................................... 22

Character set ................................................. 34

Circuit board links .......................................... 13

Command mnemonics ..................................... 31

Configuration

Circuit board links ....................................... 13

Hardware ................................................... 14

Software..................................................... 14

D

Data bits ........................................................ 14

Data formats .................................................. 17

F

Function codes ...................................... 44 to 46

H

Hardware handshake ...................................... 14

Index

I

Installation

Electrical ...................................................... 9

Mechanical .................................................. 4

180 mm recorders...................................... 7

250mm continuous-trace recorders ............... 6

Instrument mnemonics ...................................... 27

M

Modbus protocol ............................................ 42

P

Parameter

Addressing ................................................. 17

Alarm ........................................................ 25

Derived channel .......................................... 24

Input channel .............................................. 20

Instrument ................................................... 27

Mnemonics overview ................................... 18

Output channel ........................................... 22

Scrolling order ............................................ 33

Parity setting .................................................. 14

Protocol selection ............................................ 14

R

Reading analogue values

16-bit ......................................................... 42

32-bit ......................................................... 43

Reading totaliser values ................................... 43

RS232/RS422/RS485 selection

Isolated version ............................................. 9

Original version ............................................ 5

S

Software Handshake ....................................... 14

Stop bits ........................................................ 14

T

Termination and biasing .................................. 11

X

XMODEM transfer .......................................... 46

XON-XOFF .................................................... 14

Page 48

HA246958

Issue 14 Mar 02

Inter-Company sales and service locations

Australia

Eurotherm Pty. Limited.

Unit 10.

40 Brookhollow Avenue,

Baulkham Hills,

NSW 2153

Telephone: 61 2 9634 8444

Fax: 61 2 9634 8555 e-mail: [email protected]

http://www.eurotherm.com.au

Austria

Eurotherm GmbH

Geiereckstraße 18/1,

A1110 Wien,

Telephone: 43 1 798 76 01

Fax: 43 1 798 76 05 e-mail:[email protected]

http://www.eurotherm.at

Belgium

Eurotherm BV,

Kontichsesteenweg 54

2630 Aartselaar

Antwerpen

Telephone: 32 3 320 8550

Fax: 32 3 321 7363

Denmark

Eurotherm Danmark A/S

Finsensvej 86,

DK 2000 Fredriksberg,

Telephone: +45 (38) 871622

Fax: +45 (38) 872124 e-mail: [email protected]

Finland

Eurotherm Finland,

Aurakatu 12A,

FIN-20100 Turku

Telephone: 358 2 25 06 030

Fax: 358 2 25 03 201

France

Eurotherm Automation Division Chessell

Parc d'Affaires,

6, Chemin des Joncs,

BP55

F - 69574 Dardilly, CEDEX

Telephone: 33 0 4 78 66 55 20

Fax: 33 0 4 78 66 55 35

Germany

Eurotherm Deutschland GmbH

Ottostraße 1,

65549 Limburg

Tel: +49 (0) 64 31/2 98 - 0

Fax: +49 (0) 64 31/2 98 - 1 19 e-mail:[email protected]

http://www.eurotherm-deutschland.de

Great Britain

Eurotherm Limited,

Faraday Close,

Worthing,

West Sussex BN13 3PL

Telephone: +44 (0)1903 695888

Fax: +44 (0)1903 695666 e-mail:[email protected]

or: [email protected]

http://www.eurotherm.co.uk

Hong Kong

Eurotherm Limited,

Unit D, 18/F Gee Chang Hong Centre,

65, Wong Chuk Hang Road,

Aberdeen.

Telephone: 852 2873 3826

Fax: 852 2870 0148 e-mail:[email protected]

India

Eurotherm DEL India Limited,

152, Developed Plots Estate,

Perungudi,

Chennai 600 096,

Telephone: 91 44 4961129

Fax: 91 44 4961831 e-mail: [email protected]

http://www.eurothermdel.com

Italy

Eurotherm SpA,

Via XXIV Maggio,

I-22070 Guanzate,

Como.

Telephone: 39 031 975111

Fax: 39 031 977512 e-mail:[email protected]

http://www.eurotherm.it

Japan

Densei Lambda K.K.,

Strategic Products Dept.

5F Nissay Aroma Square,

37-1, Kamata, 5-Chome,

Ohta-ku,

Tokyo 144-8721

Telephone: 81 3 5714 0620

Fax: 81 3 5714 0621 e-mail (Sales): [email protected]

e-mail (Technical): [email protected]

http://www.densei-lambda.com

Korea

Eurotherm Korea Limited,

J- Building

402-3

Poongnab-Dong,

Songpa-Ku

Seoul, 138-040

Telephone: 82 2 478 8507

Fax: 82 2 488 8508

Netherlands

Eurotherm BV,

Genielaan 4,

2404CH Alphen aan den Rijn,

The Netherlands

Telephone: 31 172 411 752

Fax: 31 172 417 260 e-mail: [email protected]

http://www.eurotherm.nl

Norway

Eurotherm A/S,

Vollsveien 13D

1366 Lysaker,

Postboks 227

NO-1326 Lysaker

Norway,

Telephone: 47 67 592170

Fax: 47 67 118301 http://www.eurotherm.no

Spain

Eurotherm España SA,

Pol. Ind. De Alcobendas,

Calle de la Granja 74,

28108 Alcobendas,

Madrid.

Telephone: 34 91 661 60 01

Fax: 34 91 661 90 93 http://www.eurotherm.es

Sweden

Eurotherm AB,

Lundavägen 143,

S-21224 Malmö.

Telephone: 46 40 38 45 00


http://www.eurotherm.se

Switzerland

Eurotherm Produkte (Schweiz) AG,

Schwerzistraße, 20,

CH-8807 Freienbach.

Telephone: 41 55 415 44 00


http://www.eurotherm.ch

United States of America

Eurotherm Recorders Inc.

741-F Miller Drive

Leesburg

VA 20175-8993

Telephone: 1 703 669 1342

Fax: 1 703 669 1307 e-mail (Sales): [email protected]

e-mail (Technical): [email protected]

http://www.chessell.com

ε

E U R O T H E R M

EUROTHERM LIMITED

Faraday Close, Durrington, Worthing, West Sussex, BN13 3PL

Telephone: 01903 695888 Facsimile: 01903 695666 e-mail: [email protected]

Website: http://www.eurotherm.co.uk

Specification subject to change without notice. ©Eurotherm Limited.

HA246958/14 (CN13655)

Eurotherm 4181/4250 Chart Recorders Serial Comms Owner's Manual

Serial

Communications

Manual

ε

Communications Manual

List of contents

List of contents (Cont.)

COMMUNICATIONS

1 INTRODUCTION

2 INSTALLATION

2.1 INSTALLATION OF ORIGINAL VERSION (OLDER 250MM RECORDERS ONLY)

2.2 ISOLATED VERSION INSTALLATION

A

A

B

B

B

C

D

2.3 COMMUNICATIONS WIRING

Isolated Comms

(2 x 9-way D-types)

Comms pinouts for current recorders and I/O (data acquisition) racks.

(I/O racks may use only the fixed male connector (plug) for the serial link)

Comms pinouts for Graphics Display Units

Non-Isolated Comms

(25-way D-type)

Comms pinouts for previous recorder versions

2.4 HARDWARE CONFIGURATION

3 MODEL 4001 COMMUNICATIONS

3.1 COMMUNICATIONS PROTOCOLS

3.2 PARAMETER ADDRESSING

3.3 DATA FORMATS

3.4 MNEMONICS

Channel mnemonics (see table 3.4.1)

Alarm mnemonics (see table 3.4.2)

Instrument mnemonics (see table 3.4.3)

3.5 COMMAND MNEMONICS

3.6 PARAMETER SCROLLING

3.7 CHARACTER SET

3.8 APPLICATION NOTES

4 GOULD MODICON MODBUS PROTOCOL

4.1 CHANNEL ADDRESSING

4.2 READING ANALOGUE VALUES

4.3 FUNCTION CODES

5 XMODEM TRANSFER

6 LIST OF EFFECTIVE PAGES

Index

Inter-Company sales and service locations

ε

E U R O T H E R M

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Table of contents