Toshiba PROSEC T3 AS311 Programmable Controller User’s Manual

Below you will find brief information for Programmable Controller PROSEC T3 AS311. The AS311 is a general purpose data communication module for Toshiba’s Programmable Controller PROSEC-T3, allowing it to communicate with external devices, such as microcomputers, bar code readers, printers, and sensors. It offers two serial interface ports, one selectable between RS-232C and RS-422, and the other fixed as RS-232C. The AS311 works as a communications driver for the T3, managing the data transfer process between the controller and external devices.

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UM-TS03***-E020

PROGRAMMABLE CONTROLLER

PROSEC

ASCII INTERFACE MODULE

AS311

USER’S MANUAL

TOSHIBA CORPORATION

Important Information

Misuse of this equipment can result in property damage or human injury.

Because controlled system applications vary widely, you should satisfy yourself as to the acceptability of this equipment for your intended purpose.

In no event will Toshiba Corporation be responsible or liable for either indirect or consequential damage or injury that may result from the use of this equipment.

No patent liability is assumed by Toshiba Corporation with respect to use of information, illustrations, circuits, equipment or examples of application in this publication.

Toshiba Corporation reserves the right to make changes and improvements to this publication and/or related products at any time without notice. No obligation shall be incurred other than as noted in this publication.

This publication is copyrighted and contains proprietary material. No part of this book may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means



electrical, mechanical, photocopying, recording, or otherwise



without obtaining prior written permission from Toshiba Corporation.

Tokyo, Japan

Publication number: UM-TS03***-E020

1st edition May 1995

Safety Precautions

•

This module (AS311) has been designed for Toshiba’s Programmable Controller

PROSEC-T3 (hereafter called T3). Use this module only on the T3’s rack.

•

Read the Safety Precautions described on the T3 User’s Manual before using the T3 and this module.

•

Follow the instructions described on this manual and on the T3 User’s Manual when installing and wiring the T3 and this module.

•

Do not touch the connector pins or components on the printed circuit board of this module.

•

The maximum number of AS311s that can be controlled by one T3 is not limited by software. However, this module consumes maximum 1 A of internal 5 Vdc power. Confirm that the total 5 Vdc consumed current per one power supply module is within the limit (7A).

Symbols Used In This Manual

Pay attention to information preceded by the following symbols.

HINT

Refers to helpful suggestions on how to operate effectively.

NOTE

Refers to information considered essential for full understanding of operation.

And refers to conditions that could damage the equipment or render it temporarily inoperative.

About This Manual

About This Manual

This manual explains the specifications and operations of the ASCII Interface Module

(AS311) for Programmable Controller T3. Read this manual carefully before using the

Inside This Manual

This manual consists of six sections and an appendix as follows.

Section 1 Overview

Introduces The AS311. Outline of the function, applications and the external features are provided in this section. Read this section at first to understand the general operation of the AS311. The switch settings of this module are also explained in this section.

Section 2 Specifications

Provides the functional and the transmission specifications of the AS311. Refer to this section to confirm the application limitations.

Section 3 Cable Connections

Provides the information for hardware preparations. The transmission cable connection is explained in this section.

Section 4 Register Configuration

Explains the memory contents of the AS311. This information is important to interchange data between T3 and AS311.

Section 5 Operation Procedure

Provides the information to design the T3 program for using the AS311. Some sample programs are provided in this section. Read this section carefully for programming.

Section 6 RAS Information

Provides the helpful information for RAS (Reliability, Availability and Serviceability). Also, lists the check points in case of unexpected operations.

Appendix

The specifications of READ and WRITE instructions are described. These instructions are used for interchanging data between T3 and AS311.

ASCII Interface Module (AS311)

About This Manual

Related Manuals

The following related manuals are available for T3. Besides this manual, read the following manuals for your better understanding.

T3 User’s Manual - Hardware

This manual covers the T3’s main body and basic I/O - their specifications, handling, maintenance and services.

T3 User’s Manual - Functions

This manual explains the functions of the T3 and how to use them. The necessary information to create user program is covered in this manual.

T-series Instruction Set

This manual provides the detailed specifications of instructions for Toshiba’s T-series

T-PDS (Ver. 1.4) Basic Operation Manual

This manual explains how to install the T-series program development system (T-PDS) into your computer and provides basic programming operations.

T-PDS (Ver. 1.4) Command Reference Manual

This manual explains the T-series program development system (T-PDS) in detail.

T-PDS (Ver. 1.6) Expanded Functions

This manual explains the expanded functions on the T-PDS version 1.6. This manual supplements the T-PDS (Ver.1.4) Command Reference Manual.

T-series Computer Link Function

This manual provides the information for a computer to communicate with T3 through the

T-series Programmable Controller’s Computer Link function.

Terminology

The following terms and abbreviations are used in this manual.

•

ASCII:

•

EIA:

•

I/O:

•

LED:

•

RS-232C:

•

RS-422:

American Standard Code for Information Interchange

Electronic Industries Association

Input/Output

Light Emitting Diode

An EIA standard for data transmission

Contents

About This Manual

.................................................................................. 2

2.3 Transmission specifications ............................................................. 17

4.1

4.2

I/O allocation and I/O registers ........................................................ 24

AS311 buffer memory ........................................................................ 26

4.2.1 Memory map ............................................................................... 26

4.2.2 Buffer memory access ................................................................ 27

4.2.3 Parameter area ............................................................................ 29

4.2.4 Receiving and transmitting data area .......................................... 36

5.1

5.2

Transmission message format .......................................................... 38

Received message read sequence .................................................. 39

5.2.1 Flag control timing ....................................................................... 39

5.2.2 T3 sample program for message receiving ................................... 40

5.3 Write sequence for message transmitting ....................................... 43

5.3.1 Flag control timing ....................................................................... 43

5.3.2 T3 sample program for message transmitting ................................ 44

5.4 Checking the AS311 operation status .............................................. 47

5.5

5.6

5.7

Resetting the AS311 by software ...................................................... 48

Setting the trailing code .................................................................... 49

Setting the time-out check time ........................................................ 50

ASCII Interface Module (AS311)

Contents

6.2 Buffer memory information ................................................................ 53

6.2.1 Module status .............................................................................. 53

6.2.2 Switch setting status ................................................................... 54

6.2.3 Error information for data receiving .............................................. 55

6.2.4 Error information for data transmitting .......................................... 56

A.1

A.2

Specification of the READ instruction ...............................................

Specification of the WRITE instruction ............................................

ASCII Interface Module (AS311)

Section 1 AS311 Overview

1.2 functions

1. AS311 Overview

1.1 Introduction

The ASCII interface module AS311 (hereafter called AS311) is a general purpose data communication module for Toshiba’s Programmable Controller PROSEC-T3 (hereafter called T3). By using the AS311, T3 can communicate with external devices, such as a micro computer, bar code reader, printer, display device, sensor, etc., through the serial interface RS-232C or RS-422.

The AS311 has two ports of the serial interface. One port (channel 1) can be selected either RS-232C or RS-422 by switch setting. The other port (channel 2) is RS-232C interface. These two ports can be used independently for data receiving and transmitting.

The transmission is asynchronous (start-stop system).

ASCII is used as the transmission data code.

The figure below shows the typical system configuration.

AS311

Channel 1

RS-232C or RS-422

CPU module

Channel 2

RS-232C

NOTE

The maximum number of AS311 that can be controlled by one T3 is not limited by software. However, this module consumes maximum 1 A of internal 5 Vdc power.

Confirm that the total 5 Vdc consumed current per one power supply module is within the limit (7 A).

ASCII Interface Module (AS311)

1. AS311 Overview

1.2 AS311 functions

From the point of view of T3, the AS311 works as communications driver. The followings are the simplified explanations for T3 and AS311 functions.

When a message (one set of transmission characters) is received by AS311, the flag which indicates the receiving complete will come ON. T3 can check the flag status then read the message from the AS311 by using the READ instruction.

In case of transmitting a message (one set of transmission characters) from T3 through

AS311, T3 writes the message into the AS311 by using the WRITE instruction, then sets the flag which instruct the AS311 to start transmitting the message.

AS311

Buffer memory

READ Receiving area

WRITE Transmitting area

READ Receiving area

WRITE Transmitting area

Receiving buffer

Transmitting buffer

Receiving buffer

Transmitting buffer

Channel 1

Channel 2

Here, a message (one set of transmission characters) means a string of ASCII characters which is ended by specified trailing code. The default setting of the trailing code is CR (carriage return code = H0D).

Applicable message format (default trailing code):

1 2 3 4 N-1 N

N: message length = 896 bytes max.

In other words, the AS311 cannot be used for the data communication in which the transmission message is ended by two or more types of trailing code.

1. AS311 Overview

1.3 External features

AS311

•

RUN

TX1

RX1

TX2

RX2

SW1

SW2

SW3

↓

→

RSW

RESET

CH1

CH2

ASCII Interface Module (AS311)

Status LEDs

Channel 1 transmission parameter setting switches

Channel 2 transmission parameter setting switches

RS-232C/RS-422 selection switches

Optional rotary switches

Hardware reset switch

Channel 1 serial port (RS-232C/RS-422)

D-Sub 25-pin female connector

Channel 2 serial port (RS-232C)

D-Sub 25-pin female connector

1. AS311 Overview

RUN: Lit when AS311 is operating normally

TX1: Lit while transmitting data from channel 1

RX1: Lit while receiving data to channel 1

TX2: Lit while transmitting data from channel 2

RX2: Lit while receiving data to channel 2

→

SW1

No.8

…

No use (set always ON)

No.7

Stop bit

OFF ON

2 bit 1 bit

No.6

Data bit length

OFF ON

7 bit 8 bit

No.5

No.4

Parity

OFF ON ON

OFF/ON OFF ON

None Even Odd

No.3

No.2

No.1

OFF OFF OFF OFF ON ON ON

OFF OFF ON ON OFF OFF ON

OFF ON OFF ON OFF ON OFF

Baud rate 300 600 1200 2400 4800 9600 19200

Used to set the transmission parameters for channel 2. The functions of each switch

are the same as the SW1. Set the transmission parameters independently for

channel 1 and channel 2.

NOTE

The factory settings of the SW1 and SW2 are as shown above figure.

That is, 1 stop bit, 8 data bits, odd parity and 9600 bps.

1. AS311 Overview

→

SW3

NOTE

RSW1

RSW2

Used to select the interface of the channel 1 either

RS-232C or RS-422.

No.1

Interface

OFF ON

RS-232C RS-422

Used to connect the terminating resistor (120

Ω

) between RXDA and RXDB. (Effective for RS-422)

No.2

Terminating

OFF ON

Not connect Connect

Used to connect the terminating resistor (120

Ω

) between CTSA and CTSB. (Effective for RS-422)

No.3

Terminating

OFF ON

Not connect Connect

The switches No.2 and No.3 should be set to ON when the AS311 is configured as terminal station on the RS-422 transmission line.

The factory settings of the SW3 are all OFF.

Always set the RSW1 to 4 and the RSW2 to 0.

(Other settings are for future use)

Do not set other than above, otherwise the AS311 will not work correctly.

ASCII Interface Module (AS311)

1. AS311 Overview

Hardware reset switch

When this switch is pressed, the AS311 will be reset. Use this switch when you

have changed the switch settings.

Channel 1 and channel 2 serial ports

Used to connect the serial transmission line (RS-232C or RS-422). D-Sub 25-pin

female connectors are provided on the AS311.

The pin assignment is as follows.

Channel 1

(RS-232C/RS-422)

1 FG

↔

2 TXD

→

3 RXD

←

for RS-232C

4 RTS

→

5 CTS

←

7 SG

↔

9 5 Vdc

→

←

for RS-422

Channel 2

(RS-232C)

1 FG

↔

2 TXD

→

3 RXD

←

4 RTS

→

5 CTS

←

6 DSR

←

7 SG

↔

9 5 Vdc

→

14 14

15 15

16 16

17 17

18 18

19 19

→

for RS232C

←

for RS-422

20 DTR

→

25 25

•

The arrow on the above figure shows the signal direction.

•

FG is connected with the T3’s frame ground internally. (both channels)

•

DTR and RTS are ON while power is on.

•

Data transmitting is available when CTS is ON. DSR has no effect for transmission.

•

Pin 9 (5 Vdc) can be used to supply 5 Vdc power. (total max. 50 mA)

ASCII Interface Module (AS311)

Section 2 Specifications

2. Specifications

2.1 General specifications

Power voltage 5 Vdc (supplied from back plane bus)

Current consumption 1.0 A (5 Vdc) maximum

Environmental conditions Conforms to T3 specifications

Insulation resistance

10 M

Ω

(500 Vdc)

Withstand voltage 500 Vac - 1 minute

Size T3 I/O module size (1 slot)

Note (1)

Note (2)

Note (1) The T3’s power supply module can supply maximum 7 A of internal 5 Vdc.

Check that the internal 5 Vdc current consumption per one power supply module does not exceed the limit.

Note (2) Between interface connector pins and internal circuit.

2.2 Functional specifications

Item Specifications

Module type

I/O allocation type

Buffer memory capacity

Transmission interface

Serial communication interface iX+Y 4W

448 words x 4

(accessed from T3 by READ/WRITE instruction)

2 channels;

Channel 1

…

RS-232C or RS-422 (selectable)

Channel 2

…

RS-232C

Connectable devices

RAS function

RUN

…

lit when operating normally

TX1

…

lit while transmitting data from channel 1

RX1

…

lit while receiving data to channel 1

TX2

…

lit while transmitting data from channel 2

RX2

…

lit while receiving data to channel 2

Computer, bar code reader, display device, sensor, printer, or other serial ASCII device

Self diagnosis, watch dog timer (200 ms), transmission error check, etc.

ASCII Interface Module (AS311)

2. Specifications

2.3 Transmission specifications

Item

Interface

Transmission mode

Synchronizing

Transmission speed

Frame format

Transmission code

Message length

Configuration

Transmission distance

Connector

Channel 1

RS-232C or RS-422

Full-duplex

Start-stop method (asynchronous)

300, 600, 1200, 2400, 4800, 9600, 19200 bps

Start bit

Data

Parity

Stop bit

1 bit

7 or 8 bits even / odd / none

1 or 2 bits

ASCII

Max. 896 bytes

One to one (Note)

Max. 15 m (RS-232C)

Max. 1 km (RS-422)

D-sub 25-pin female

Channel 2

RS-232C

Max. 15 m

D-sub 25-pin female

Note) In case of RS-422 interface, multiple devices can be connected to one AS311 if the connected RS-422 devices work as slave stations and support multi-point connection. That is, the connected RS-422 devices must have the transmission generators which support the passive state. Also, the RS-422 devices must support the message format which contains the selecting address. In this case, the number of the connected RS-422 devices is limited up to 10.

On the other hand, the AS311’s transmission generator does not support the passive state. Therefore the AS311 must be the master station in the one-to-N configuration.

ASCII Interface Module (AS311)

Section 3 Cable Connections

3. Cable Connections

3.1 RS-232C connection

The following figure shows the RS-232C connection.

AS311 Shielded cable

3

4

5

1

2

6

7

20 FG

TXD

RXD

RTS

CTS

(DSR)

SG

DTR

RS-232C device

RXD

TXD

DTR

SG

DSR

RTS

CTS

(1) DSR is supported only on the channel 2.

(2) Connect SG each other.

(3) Use shielded cable. The cable shield should be connected to FG at one end.

(4) It is recommended to use twisted cable for noise immunity.

NOTE

Do not connect or remove the connector while the AS311 is powered. Otherwise, it will cause damage to the AS311.

ASCII Interface Module (AS311)

3. Cable Connections

3.2 RS-422 connection

The channel 1 can be selected either RS-232C or RS-422. The following figure shows the RS-422 connection.

AS311

1

10

21

11

22

7

12

23

13

24 FG

TXDA

TXDB

RXDA

RXDB

SG

RTSA

RTSB

CTSA

CTSB

Shielded cable RS-422 device

FG

RXDA

RXDB

TXDA

TXDB

SG

CTSA

CTSB

RTSA

RTSB

(1) On the AS311, connect the built-in terminating resistors (120

Ω

) between RXDA

and RXDB and between CTSA and CTSB by setting switches.

(Set the SW3-2 and SW3-3 to ON)

(2) On the RS-422 device, connect the terminating resistors R (120

Ω

- 1/2 W)

between RXDA and RXDB and between CTSA and CTSB.

(3) Connect SG each other.

(4) Use shielded twisted-pair cable. The A (+) and B (-) of the same signal should be

paired.

(5) The cable shield should be connected to FG at one end.

NOTE

Do not connect or remove the connector while the AS311 is powered. Otherwise, it will cause damage to the AS311.

ASCII Interface Module (AS311)

Section 4 Register Configuration

4.1 I/O allocation and I/O registers

4.2 AS311 buffer memory

4. Register Configuration

4.1 I/O allocation and I/O registers

The AS311 has the I/O type ‘i X+Y 4W’ for I/O allocation. When the automatic I/O allocation is performed with mounting the AS311, the following I/O allocation table will be created in the T3.

(T-PDS screen example - in the case that AS311 is mounted on Slot 0 of Unit 0)

Then, 4 I/O registers, XW(n), XW(n+1), YW(n+2) and YW(n+3), are assigned to the

AS311.

In the above example, XW000, XW001, YW002 and YW003 are assigned.

Note that the I/O type has ‘i’ designation. It means that the T3 will not update the assigned I/O registers in the batch I/O processing. To read or write data through the I/O registers, the Direct I/O instruction (FUN235) or the direct I/O designation

(I/IW and O/OW instead of X/XW and Y/YW) is necessary.

The reason of that is because the reading and writing timings are important for handshaking between T3 and AS311. Refer to section 5.

ASCII Interface Module (AS311)

4. Register Configuration

The following table shows the functions of I/O registers assigned to the AS311.

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

XW(n)

XW(n+1)

YW(n+2)

YW(n+3)

No use

CH1 status

Name

F Write ready

Description

1: ready to write data (transmit) for channel 1

(CH1)

E Transmit complete 1: transmitting has been completed normally

XW(n)

D Transmit error

C - 8

−

7 Read ready

1: transmitting has been canceled by error

No use (always 0)

1: ready to read the received data

6 Receive complete 1: receiving for channel 1 has been completed

5 Receive error

4 - 0

−

F Write ready

1: receiving error has occurred

No use (always 0)

1: ready to write data (transmit) for channel 2

(CH2)

E Transmit complete 1: transmitting has been completed normally

D Transmit error

XW(n+1) C - 8

−

7 Read ready

1: transmitting has been canceled by error

No use (always 0)

1: ready to read the received data

(CH1)

6 Receive complete 1: receiving for channel 2 has been completed

5 Receive error

4 - 0

6 - 0

−

F Transmit start

YW(n+2) E - 8

−

7 Read start

−

F Transmit start

YW(n+3) E - 8

−

(CH2) 7 Read start

6 - 0

−

1: receiving error has occurred

No use (always 0)

Set to 1 to start transmitting data from channel 1

No use (set to 0)

Set to 1 to start reading data for channel 1

No use (set to 0)

Set to 1 to start transmitting data from channel 2

No use (set to 0)

Set to 1 to start reading data for channel 2

No use (set to 0)

NOTE

These bits are used for handshaking between T3 and AS311. The detailed function and timing are explained in section 5.

4. Register Configuration

4.2 AS311 buffer memory

As explained in the previous section, the I/O registers that are assigned to AS311 are used to control the reading and writing timings (handshake) between T3 and

AS311.

On the other hand, for exchanging the transmission data between T3 and AS311, the

AS311’s buffer memory is used.

This section explains the buffer memory contents and how to access the buffer memory.

The AS311 has the buffer memory that is used to exchange data with T3. The overall map of the buffer memory is as follows.

Address Word data

128

Status and command

4 Parameter

124 words - transmission parameters, etc.

Channel 1 reading (receiving) data area

4 words - same data as I/O registers

448 words

576

448 words

1024

Channel 1 writing (transmitting) data area

Channel 2 reading (receiving) data area

448 words

1472 Channel 2 writing (transmitting) data area

448 words inhibited

128 words

ASCII Interface Module (AS311)

4. Register Configuration

4.2.2 Buffer memory access

T3 can read the AS311’s buffer memory contents by using READ instruction (FUN237).

Also, T3 can write data into the buffer memory by using WRITE instruction (FUN238).

READ instruction (FUN237)

Expression:



[ (A) READ (B)

→



Operands:

(A):

(B):

I/O register (XW/YW) assigned to the AS311

Starting address of the buffer memory to be read

(B)+1: Number of words to be read (max. 256)

(C): Starting register of the destination

Example:

R0100

[ 00128 MOV D5000 ] [ 00064 MOV D5001 ]

[ XW000 READ D5000

→

D1000 ]

When R0100 is ON, 64 words of buffer memory data starting with address 128 are read from the AS311 which is allocated to XW000. And the data are stored in D1000 and after.

4. Register Configuration

WRITE instruction (FUN238)

Expression:



[ (A) WRITE (B)

→



Operands:

(A): Starting register of the source

(B): Starting address of the buffer memory to be written

(B)+1: Number of words to be written (max. 256)

(C): I/O register (XW/YW) assigned to the AS311

Example:

R0101

[ 00576 MOV D5000 ] [ 00100 MOV D5001 ]

[ D2000 WRITE D5000

→

YW002 ]

When R0101 is ON, 100 words of data starting with D2000 (D2000 to D2099) are written into the buffer memory address 576 and after of the AS311 which is allocated to YW002.

ASCII Interface Module (AS311)

4. Register Configuration

The parameter area of the buffer memory contains the following contents.

Address Address

1 CH2 status Status and

65 command 66

6 SW1

7 SW2

71 Reserved

16 CH1 receive error

17 CH1 transmit error

18 CH1 channel status

19 CH1 receive length

24 CH1 trailing code

25 CH1 time-out check CH1

80 CH2 receive error

81 CH2 transmit error

82 CH2 channel status

83 CH2 receive length

88 CH2 trailing code

89 CH2 time-out check CH2

Note: Blanks are for future use. (Reserved)

127

4. Register Configuration

Status and command (0 - 3)

The addresses 0 to 3 store the same data as the I/O registers that are assigned to the

AS311.

Refer to section 4.1 for details.

0 CH1 status

1 CH2 status

= XW(n)

= XW(n+1)

2 CH1 command

3 CH2 command

= YW(n+2)

= YW(n+3)

Status 1 (4)

The address 4 shows the AS311 module status. If an error has occurred in the AS311, the error code is stored here.

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

4 RDY

Bit F RDY (Ready)

Bit E

Bit 7-0

ERR (Error)

Error code

1 = operating normally

0 = under initialization or error state

1 = error state

0 = no error (normal)

Shows the detected error item if ERR is 1.

(H00 when normal)

See section 6.2.1 for details.

RSW1/2 information (5)

The address 5 stores the rotary switches RSW1 and RSW2 setting status.

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

0 0 0 0 0 0 0 0

Bit 7-4

Bit 3-0

RSW1

RSW2

RSW1 RSW2

Stores the rotary switch 1 (RSW1) setting status.

0 - F

Stores the rotary switch 2 (RSW2) setting status.

0 - F

ASCII Interface Module (AS311)

4. Register Configuration

SW1 information (6)

The address 6 stores the setting status of the channel 1 transmission parameter setting switches (SW1).

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

6 0 0 0 0 0 0 0 0 SW1

SW1

OFF ON

ON: 1 OFF: 0

SW2 information (7)

The address 7 stores the setting status of the channel 2 transmission parameter setting switches (SW2).

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

SW2

0 0 0 0 0 0 0 0

SW2

OFF ON

ON: 1 OFF: 0

4. Register Configuration

Command 1 (12)

The address 12 is used to reset the AS311 by T3 program.

Two types of reset commands are available, hot reset and cold reset.

The hot reset is used to change the trailing code and the time-out check time settings.

The cold reset is used to initialize the AS311. The trailing code and the time-out check time will be reset to the default setting. The operation of the cold reset is the same as the hard reset switch and power on initialization.

Refer to sections 5.5, 5.6 and 5.7 for these functions.

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

RST

Bit F

Bit 7-0

RST (Reset)

Command number

CH1 receive error (16) and

CH2 receive error (80)

1 = reset request

0 = normal (no reset request)

HFE = hot reset

HFF = cold reset

The address 16 (for channel 1) and the address 80 (for channel 2) indicate the error contents if an error has been detected in receiving a message. This information is set during the received message read sequence.

Refer to section 6.2.3 for details.

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

16 or 80

0 0 0 0

Bit B BRK (Break)

Bit A

Bit 9

Bit 8

Bit 7-0

1 = break detected

0 = normal

PE (Parity error) 1 = parity error

0 = normal

(Framing error)

1 = framing error

0 = normal

(Overrun error)

Receive error code

1 = overrun error

0 = normal

Shows the error code regarding received message.

(H00 when normal)

See section 6.2.3 for details.

ASCII Interface Module (AS311)

4. Register Configuration

CH1 transmit error (17) and

CH2 transmit error (81)

The address 17 (for channel 1) and the address 81 (for channel 2) indicate the error contents if an error has occurred during message transmitting. This information is set during the write sequence for message transmitting.

Refer to section 6.2.4 for details.

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

17 or 81 0 0 0 0 0 0 0 0

Bit 7-0 Transmit error code

Shows the error code for transmitting.

(H00 when normal)

See section 6.2.4 for details.

CH1 channel status (18) and

CH2 channel status (82)

The address 18 (for channel 1) and the address 82 (for channel 2) indicate the control signal status. This information is always updated.

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

18 or 82

0 0 0 0 0 0 0

Bit 8

Bit 7

Bit 3

IDL (Idle)

DSR

(Data set ready)

CTS

(Clear to send)

1 = transmitter is idle state

0 = transmitter is non-idle state

1 = DSR is ON

0 = DSR is OFF Note (1)

1 = CTS is ON

0 = CTS is OFF

Note: (1) The channel 1 does not support DSR. Therefore, bit 7 of the address 18 is

always 0.

(2) The bit 2 is always 1.

4. Register Configuration

CH1 receive length (19) and

CH2 receive length (83)

The address 19 (for channel 1) and the address 83 (for channel 2) indicate the length of the received message (number of bytes). This information is set during the received message read sequence.

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

19 or 83

Bit F-0 Received message length

Received message length

Shows the received message length (bytes).

0 - 896

CH1 trailing code (24) and

CH2 trailing code (88)

The address 24 (for channel 1) and the address 88 (for channel 2) store the trailing codes. The default setting is H0D (CR code).

To change the trailing code, write the desired code into this address then write the hot reset command into the Command 1 (12). See section 5.6 for this procedure.

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

24 or 88

0 0 0 0 0 0 0 0

Bit 7-0 Trailing code Stores the trailing code.

Initial value at power on is H0D (carriage return).

ASCII Interface Module (AS311)

4. Register Configuration

CH1 time-out check (25) and

CH2 time-out check (89)

The address 25 (for channel 1) and the address 89 (for channel 2) store the time-out check times. If the time between each receiving character exceeds the specified time-out check time, it becomes the receiving time-out error. The default setting is 1 second.

To change the setting, write the desired data into this address then write the hot reset command into the Command 1 (12). See section 5.7 for this procedure.

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

Time-out check time

25 or 89

Bit F-0 Time-out check time

Stores the time-out check time (0.1 s units).

Valid data range is 1 to 600 (0.1 to 60 s). If 0 or more than 600 is specified, the time-out check will not work.

Initial value at power on is 10 (1 s).

4. Register Configuration

4.2.4 Receiving and transmitting data area

The receiving and transmitting data area is provided to exchange the communication characters between T3 and AS311. The address ranges in the AS311 buffer memory are as follows.

Address Word data

128 Channel 1 reading (receiving) data area

576 Channel 1 writing (transmitting) data area

1024

1472

Channel 2 reading (receiving) data area

Channel 2 writing (transmitting) data area

448 words

When AS311 receives a message (one set of transmission characters), AS311 sets the characters into the receiving data area starting with the address 128 or 1024. Then T3 can read these characters from the receiving data area by using READ instruction.

When T3 attempts to send a message via AS311, T3 writes the characters into the transmitting data area starting with the address 576 or 1472 by using WRITE instruction, and instructs AS311 to start transmitting. AS311 recognizes from the character stored in the starting address (576 or 1472) to the trailing code character as the one set of transmitting message.

Refer to section 5 for message receiving/transmitting procedure.

ASCII Interface Module (AS311)

Section 5 Operation Procedure

5.1 Transmission message format

5.2 Received message read sequence

5.3 Write sequence for message transmitting

5.4 Checking the AS311 operation status

5.5 Resetting the AS311 by software

5.6 Setting the trailing code

5.7 Setting the time-out check time

5. Operation Procedure

5.1 Transmission message format

The transmission message is composed by ASCII characters and a specified trailing code. The default setting of the trailing code is CR (carriage return code = H0D).

Refer to section 5.6 for setting the trailing code other than CR.

The maximum length of a message is 896 bytes. An example of the message is

1 2 3 4 5 6 7 8 9

″

″ ″

″

In the above figure,

″ x

″

means an ASCII character. For example,

″

is H30.

When the above message is received or transmitted, the data arrangements in the

T3 registers are as follows.

n+1

n+2

n+3

″

n+4 CR

Transmission message

″

ASCII Interface Module (AS311)

5. Operation Procedure

5.2 Received message read sequence

5.2.1 Flag control timing

In case of receiving a message, the following flags are used for handshaking between

T3 and AS311. These flags are the bits of the I/O registers assigned to the AS311.

Refer to section 4.1.

Read ready

Bit 7 of XW(n) for channel 1 or XW(n+1) for channel 2

Receive complete

Bit 6 of XW(n) for channel 1 or XW(n+1) for channel 2

Receive error

Bit 5 of XW(n) for channel 1 or XW(n+1) for channel 2

Read start

Normal receiving

Bit 7 of YW(n+2) for channel 1 or YW(n+3) for channel 2

The message receiving procedure is as follows. It is called “received message read sequence”.

AS311 receives a message

AS311 sets the message into buffer memory (receiving data area), and sets the received message length into buffer memory (parameter area)

T3 reads the message form buffer memory (receiving data area) by READ instruction

T3 Read start to OFF

Receiving error

AS311 sets the error information into buffer memory (parameter area)

AS311 sets Receive error to ON, and resets Receive complete to OFF

T3 reads the error information from buffer memory (parameter area) by READ instruction

T3 resets Read start to OFF

AS311 resets Receive error to OFF

5. Operation Procedure

5.2.2 T3 sample program for message receiving

A sample program for the “received message read sequence” is shown below.

This sample program is for the channel 1 of the AS311 that is allocated to XW000 -

YW003.

Operation for normal received message

Operation for receiving error

(Subroutine No. 0)

ASCII Interface Module (AS311)

5. Operation Procedure

In this sample program, the following devices/registers are used.

R0100 AS311 status (ON when ready) - Refer to section 5.4

R0200 Receiving normal complete (comes ON when receiving is complete normally)

R0300 Receiving error complete (comes ON when receiving error has occurred)

X0006 Receive complete flag

X0007 Read ready flag

X0005 Receive error flag

Y0027 Read start flag

D0000 - D0063 Received message is stored here

D3000 Receiving error information is stored here

D4000 - D4001 Parameters for READ instruction

This sample program works as follows.

Main program

- Rung 1: Calls Subroutine No. 0 when the AS311 is normal and both R0200 and

R0300 are OFF.

- Rung 2: When R0200 comes ON (normal receiving), performs the necessary

operation for the received message, then resets R0200 to OFF.

- Rung 3: When R0300 comes ON (receiving error has occurred), performs the error

processing, then resets R0300 to OFF.

Subroutine No. 0

- Rung 1: Indicates the entry of Subroutine No. 0.

- Rung 2: Reads XW000 and XW001 from the AS311 by direct I/O instruction.

- Rung 3: Sets Y0027 (Read start flag) to ON if X0006 (Receive complete flag) is ON.

- Rung 4: When X0007 (Read ready flag) comes ON, reads the received message from

the AS311’s buffer memory, 64 words starting with address 128, by READ instruction,

and stores it into D0000 and after. Then resets Y0027 (Read start flag) to OFF, and

sets R0200 to ON.

When X0005 (Receive error flag) comes ON, reads the error information from the

AS311’s buffer memory, 1 word of address 16, by READ instruction, and stores it into

D3000. Then resets Y0027 (Read start flag) to OFF, and sets R0300 to ON.

- Rung 5: Writes YW002 and YW003 into the AS311 by direct I/O instruction.

- Rung 6: Indicates the return of Subroutine No. 0.

5. Operation Procedure

Explanation for this sample program:

(1) The “received message read sequence” is programmed on Subroutine No. 0.

(2) The Subroutine No. 0 is called from Main program with resetting R0200 and R0300

(3) When a message is received normally, R0200 will come ON and the message

(ASCII characters) will be stored in D0000 to D0063. In this sample program, the received message length information (buffer memory address 19) is not used. The maximum length of a message is 128 bytes (64 words) because the number of read words of the READ instruction is programmed as 64 words.

(4) When an error has occurred in receiving the message, R0300 will come ON and the error information will be stored in D3000. For details of the error information, refer to section 6.2.3.

ASCII Interface Module (AS311)

5. Operation Procedure

5.3 Write sequence for message transmitting

5.3.1 Flag control timing

In case of transmitting a message, the following flags are used for handshaking between T3 and AS311. These flags are the bits of the I/O registers assigned to the

AS311. Refer to section 4.1.

Write ready

Bit F of XW(n) for channel 1 or XW(n+1) for channel 2

Transmit complete

Bit E of XW(n) for channel 1 or XW(n+1) for channel 2

Transmit error

Bit D of XW(n) for channel 1 or XW(n+1) for channel 2

Transmit start

Normal transmitting

Bit F of YW(n+2) for channel 1 or YW(n+3) for channel 2

The message transmitting procedure is as follows. It is called “write sequence for

T3 writes a message into buffer memory (transmitting data area) by WRITE instruction

AS311 sends out the message and

OFF, and sets Write ready to ON

Transmitting error

AS311 sets the error information into buffer memory (parameter area) and

T3 reads the error information from buffer memory (parameter area) by READ instruction, and resets

Transmit start to OFF

5. Operation Procedure

5.3.2 T3 sample program for message transmitting

A sample program for the “write sequence for message transmitting” is shown below.

This sample program is for the channel 1 of the AS311 that is allocated to XW000 -

YW003.

Set the transmission message into

D0200 - D0263, and set R0110 to ON

Operation for transmitting error

(Subroutine No. 1)

ASCII Interface Module (AS311)

5. Operation Procedure

In this sample program, the following devices/registers are used.

R0100 AS311 status (ON when ready) - Refer to section 5.4

R0110 Internal flag to start transmitting

R0201 Transmitting normal complete (comes ON when transmitting is complete normally)

R0301 Transmitting error complete (comes ON when transmitting error has occurred)

X000F Write ready flag

X000E Transmit complete flag

X000D Transmit error flag

Y002F Transmit start flag

D0200 - D0263 Transmitting message is set here

D3010 Transmitting error information is stored here

D4010 - D4011 Parameters for WRITE instruction

D4000 - D4001 Parameters for READ instruction

This sample program works as follows.

Main program

- Rung 1: Prepares a transmission message and sets it into D0200 and after (maximum

64 words in this sample). Then sets R0110 to ON.

- Rung 2: Calls Subroutine No. 1 when the AS311 is normal and R0110 is ON.

- Rung 3: When R0201 comes ON (normal transmitting), resets R0110 and R0201 to

OFF.

- Rung 4: When R0301 comes ON (transmitting error has occurred), performs the error

processing, then resets R0110 and R0301 to OFF.

Subroutine No. 1

- Rung 1: Indicates the entry of Subroutine No. 1.

- Rung 2: Reads XW000 and XW001 from the AS311 by direct I/O instruction.

- Rung 3: When X000F (Write ready flag) is ON, writes the message that is stored in

D0200 to D0263 into the AS311’s buffer memory, 64 words starting with address 576,

by WRITE instruction, and sets Y002F (Transmit start flag) to ON.

- Rung 4: When X000E (Transmit complete flag) comes ON, resets Y002F (Transmit

start flag) to OFF, and sets R0201 to ON.

When X000D (Transmit error flag) comes ON, reads the error information from the

AS311’s buffer memory, 1 word of address 17, by READ instruction, and stores it into

D3010. Then resets Y002F (Transmit start flag) to OFF, and sets R0301 to ON.

- Rung 5: Writes YW002 and YW003 into the AS311 by direct I/O instruction.

- Rung 6: Indicates the return of Subroutine No. 1.

5. Operation Procedure

Explanation for this sample program:

(1) The “write sequence for message transmitting” is programmed on Subroutine

(2) To start transmitting, set the message (ASCII characters) into D0200 and after.

Then set R0110 to ON.

The message length is maximum 128 bytes (64 words) in this sample program.

(3) When R0110 is set to ON while the AS311 is ready, the Subroutine No. 1 will be called and the message transmitting will be started.

(4) When the message is transmitted normally, R0201 will come ON. Then R0110 will be reset to OFF.

(5) When an error has occurred in transmitting the message, R0301 will come ON and the error information will be stored in D3010. For details of the error information, refer to section 6.2.4.

ASCII Interface Module (AS311)

5. Operation Procedure

5.4 Checking the AS311 operation status

AS311 operation status information is stored in the AS311’s buffer memory address 4

(Status 1). T3 can read this information by using READ instruction.

A sample program is shown below. This sample program is for the AS311 that is allocated to XW000 - YW003.

The above sample program works as follows.

- Rung 1: Resets S0051 (Instruction error flag) to OFF, and sets parameters for the

READ instruction.

- Rung 2: Reads the operation status information from the AS311’s buffer memory

address 4 (Status 1).

- Rung 3: When S0051 (Instruction error flag) is OFF and R050F (Ready) is ON, turns

R0100 to ON.

It means that the AS311 is operating normally when R0100 is ON.

If R050E (Error) is ON, the AS311 is in error state. In that case, the error code is stored in the lower 8 bits of RW050. For the error code, refer to section 6.2.1.

If S0051 (Instruction error flag) is ON, it means that an error has occurred during the

READ instruction execution.

5. Operation Procedure

5.5 Resetting the AS311 by software

AS311 can be reset by T3 program. Two types of resetting are available, cold reset and hot reset.

The cold reset is used to reset the AS311 error state. When the cold reset is executed, the AS311 will be initialized. The trailing code and the time-out check time are also reset to the default settings. This function is the same as pressing the hardware reset switch and power on initialization.

On the other hand, the hot reset is used to change the trailing code and/or the time-out

For executing these functions, write the following data into the AS311’s buffer memory address 12 (Command 1). The data writing into this address must be one-shot.

The written data will be cleared to 0 by AS311 when the operation is completed.

A sample program for the cold reset is shown below. This sample program is for the

AS311 that is allocated to XW000 - YW003.

In this sample program, the cold reset operation will be started by setting R0120 to ON.

(Subroutine No. 2)

(H80FF)

For the hot reset, refer to sections 5.6 and 5.7.

ASCII Interface Module (AS311)

5. Operation Procedure

5.6 Setting the trailing code

The default setting of the trailing code is CR (carriage return code = H0D). The trailing code can be changed by T3 program.

To do this, write desired trailing code into the AS311’s buffer memory address 24 (CH1 trailing code) and/or address 88 (CH2 trailing code), and execute the hot reset (refer to

A sample program is shown below. This sample program is for the AS311 that is allocated to XW000 - YW003.

In this sample program, the trailing code changing routine will be executed once when the AS311 status is changed to ready (R0100 comes ON - refer to section 5.4), and the channel 1 trailing code will be changed to H03.

If the channel 2 trailing code and/or the time-out check time are also changed, write these data on the Main program Rung 2 before calling Subroutine No. 3 in the same manner.

(H0003)

(Subroutine No. 3)

(H80FE)

5. Operation Procedure

5.7 Setting the time-out check time

The default setting of the time-out check time is 1 second. The time-out check time can be changed by T3 program. The valid setting range is 0.1 to 60.0 seconds in 0.1 second units. Refer to section 4.2.3.

To change the time-out check time, write desired value into the AS311’s buffer memory address 25 (CH1 time-out check) and/or address 89 (CH2 time-out check), and execute the hot reset (refer to section 5.5).

T3 program for this purpose is almost same as that for setting the trailing code (refer to section 5.6). Only the difference is writing the time-out check time instead of the trailing code. See Rung 2 of the following sample. In this sample, the channel 1 time-out check time is changed to 5 seconds.

If the channel 2 time-out check time and/or the trailing code are also changed, write these data on the Main program Rung 2 before calling Subroutine No. 3 in the same manner.

ASCII Interface Module (AS311)

Section 6 RAS Information

6.2 Buffer memory information

6. RAS Information

6.1 LED indication

On the AS311, five status LEDs are provided as follows. These LEDs are useful to check the AS311 operation status and the communication status.

RUN

TX1

RX1

TX2

RX2

TX1

RX1

TX2

RX2

RUN Indicates the AS311 operation status.

Lit when the AS311 is in ready state.

Not lit when the AS311 is in error or under initialization.

Indicates the channel 1 communication status.

Lit while some data is transmitting from the AS311.

Indicates the channel 1 communication status.

Lit while some data is receiving into the AS311.

Indicates the channel 2 communication status.

Lit while some data is transmitting from the AS311.

Indicates the channel 2 communication status.

Lit while some data is receiving into the AS311.

ASCII Interface Module (AS311)

6. RAS Information

6.2 Buffer memory information

Various RAS information are stored in the AS311’s buffer memory. These information can be read by READ instruction. When some abnormality has occurred, check these information.

Address 4 of the buffer memory stores the AS311 module status.

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

RDY

Bit F

Bit E

Bit 7-0

RDY (Ready)

ERR (Error)

Error code

1 = operating normally

0 = under initialization or error state

1 = error state

0 = no error (normal)

Shows the detected error item if ERR is 1.

See the table below (H00 when normal)

Error code

Type of error

H01 CPU error

Description

H02

H03

ROM error

RAM error error

CPU error has been detected during initialization.

ROM error has been detected during initialization.

Work RAM error has been detected during initialization. memory Buffer memory error has been detected during initialization. abnormal

H10 Watchdog timer error

Switch setting abnormality has been detected during initialization.

Watchdog timer error has occurred during operation. error

Trap interrupt has occurred by detecting illegal instruction during operation. memory Buffer memory time-out has time-out error occurred during operation.

Status

Operation is stopped.

Cold reset will be effective.

Operation is stopped.

Cold reset will be effective.

Operation is stopped.

Cold reset will be effective.

6. RAS Information

6.2.2 Switch setting status

Addresses 5, 6 and 7 of the buffer memory store the switches setting status. Check that the information agrees with the physical setting status if some abnormality has occurred.

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

0 0 0 0 0 0 0 0 RSW1 RSW2

Bit 7-4

Bit 3-0

RSW1

RSW2

Stores the rotary switch 1 (RSW1) setting status.

0 - F

Stores the rotary switch 2 (RSW2) setting status.

0 - F

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

0 0 0 0 0 0 0 0 SW1

SW1

OFF ON

ON: 1 OFF: 0

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

SW2

0 0 0 0 0 0 0 0

SW2

OFF ON

ON: 1 OFF: 0

ASCII Interface Module (AS311)

6. RAS Information

6.2.3 Error information for data receiving

Address 16 for channel 1 and address 80 for channel 2 store the error information for data receiving.

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

16 or 80

0 0 0 0

Bit B

Bit A

Bit 9

Bit 8

Bit 7-0

BRK (Break) 1 = break detected

0 = normal

When break has been detected, receive buffer is cleared. The next message can be received.

PE (Parity error) 1 = parity error

0 = normal

When parity error has occurred, the message is disabled. The next message can be received.

(Framing error)

1 = framing error

0 = normal

When framing error has occurred, the message is disabled. The next message can be received.

(Overrun error)

Receive error code

1 = overrun error

0 = normal

When overrun error has occurred, the message is disabled. The next message can be received.

Shows the error code regarding received message.

See the table below. (H00 when normal)

Error code

Type of error Description out error

H02 Message length error

Specified time-out check time has elapsed between characters.

The message length has exceeded the limit. (896 bytes) overflow buffer Receive buffer overflow has occurred.

Status

The rest of the message will be received as the next.

The message is disabled.

The next message can be received.

The message is disabled.

The next message can be received.

6. RAS Information

6.2.4 Error information for data transmitting

Address 17 for channel 1 and address 81 for channel 2 store the error information for

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

17 or 81

0 0 0 0 0 0 0 0

Bit 7-0 Transmit error code

Shows the error code for transmitting.

See the table below. (H00 when normal)

Error code

Type of error Description Status missing

The trailing code has not been written into the buffer memory.

The message is disabled.

The next message can be transmitted.

ASCII Interface Module (AS311)

6. RAS Information

6.3 Trouble shooting

When AS311 does not work properly, check the following points.

When AS311’s RUN

LED does not light;

When RX1/RX2 LED

does not light while the connected device is transmitting a message;

When the received data cannot be read properly;

When a data cannot be

transmitted from the

AS311 (TX1/TX2 LED does not light);

Does the POWER LED on the T3 power supply module

Is the AS311 mounted securely on the base ?

Are the transmission signals (RXD, SG, etc.) connected properly ?

Does the receive error occur ?

Is the T3 program working

Does the transmit error occur ?

Is the CTS signal connected properly ?

If no, check the power voltage/connection.

If no, check the internal

5 Vdc current consumption.

Remove the AS311, and mount again securely.

Check the cable connection.

Check the transmission parameters (baudrate,

Check the cable connection.

Confirm the receive

Check the T3 program.

Confirm the transmit error information.

Check the T3 program.

Check the cable connection.

If CTS signal is OFF,

ASCII Interface Module (AS311)

Appendix

A.1 Specification of the READ instruction

A.2 Specification of the WRITE instruction

Appendix

A.1 Specification of the READ instruction

FUN 237 Special module data read (READ)

Reads designated range of data from the special module.

Input Execution output

[ A READ B

→

C ]

Function

•

This instruction reads data from the buffer memory of the special module that is designated by operand A, and stores them in T3’s registers starting with operand C.

•

The transfer source address (buffer memory

Input Action Output address) is designated by operand B.

•

The transfer size (number of words) is

OFF

ON designated by operand B+1.

Error (see Note 2) ON ON

Operand

Index

Constant

Device Register

Opr Name

X Y S L R Z T. C. I O

A Special

I J K

√ √ √ √ module

B Transfer

√ √ √ √ √ √ √ √ √ √ parameter

√ √ √ √ √ √ √ √ √ √ of destination

Program example

R0000

[ XW000 READ RW010

→

D0100 ]

•

When R0000 is ON, the buffer memory data of the size indicated by RW011, starting with the address indicated by RW010 of the special module allocated to XW000, are read and stored in

D0100 and after.

•

The maximum number of words to be read is 256 words.

XW000 special module T3

Buffer memory

RW010 20

RW011 16

20 1234

35 5678

READ

16 words

D0100 1234

D0115 5678

ASCII Interface Module (AS311)

Appendix

Note 1) The special module can be designated not only by the assigned register, but also by the mounting position. The mounting position is designated by a constant data for the operand A as follows. number)

(Slot number)

Unit number Hexadecimal Slot number

0 H00

Hexadecimal

0 H00

1 H01

2 H02

3 H03

1 H01

2 H02

3 H03

4 H04

5 H05

6 H06

7 H07

8 H08

9 H09

10 H0A

For example, if a special module is mounted on Slot-4, Unit-0 (basic unit) and allocated to XW008 - YW011, the following two READ instructions function the same.

[ XW008 READ RW010

→

D0100 ]

[ H0004 READ RW010

→

D0100 ]

Note 2) The READ instruction is not executed as error in the following cases. In these cases, ERF (instruction error flag = S0051) is set to ON.

•

When the operand A is other than a valid constant (see Note 1) or XW/YW register.

•

When the designated special module has been disconnected.

•

When no answer error occurs with the designated special module.

•

When the number of words transferred exceeds 256 words.

•

When the source table of transfer is out of the valid range.

•

When the destination table of transfer is out of the valid range.

Appendix

A.2 Specification of the WRITE instruction

FUN 238 Special module data write (WRITE)

Writes designated range of data into the special module.

Input Execution output

[ A WRITE B

→

C ]

Function

•

This instruction transfers data stored in T3’s registers starting with operand A into the buffer memory of the special module that is designated by operand C.

•

The destination address (buffer memory

Input Action Output address) is designated by operand B.

•

The transfer size (number of words) is

OFF

ON designated by operand B+1.

Error (see Note 2) ON ON

Operand

Index

Constant

Device Register

Opr Name

X Y S L R Z T. C. I O I J K

√ √ √ √ √ √ √ √ √ √ √ of source

B Transfer

√ √ √ √ √ √ √ √ √ √ parameter

C Special

√ √ √ √ module

Program example

R0000

[ D0100 WRITE RW010

→

YW002 ]

•

When R0000 is ON, the register data of the size indicated by RW011, starting with D0100, are transferred to the buffer memory starting with the address indicated by RW010 of the special module allocated to YW002.

•

The maximum number of words to be transferred is 256 words.

T3 YW002 special module

RW010 320

RW011 150 Buffer memory

D0100 1234

D0249 5678

WRITE

150 words

320 1234

469 5678

ASCII Interface Module (AS311)

Appendix

(Slot number)

Unit number Hexadecimal Slot number

0 H00

Hexadecimal

0 H00

1 H01

2 H02

3 H03

1 H01

2 H02

3 H03

4 H04

5 H05

6 H06

7 H07

8 H08

9 H09

10 H0A

For example, if a special module is mounted on Slot-2, Unit-1 (expansion unit #1) and allocated to XW020 - YW023, the following two WRITE instructions function the same.

[ D0100 WRITE RW010

→

XW020 ]

[ D0100 WRITE RW010

→

H0102 ]

Note 2) The WRITE instruction is not executed as error in the following cases. In these cases, ERF (instruction error flag = S0051) is set to ON.

•

When the operand C is other than a valid constant (see Note 1) or XW/YW register.

•

When the designated special module has been disconnected.

•

When no answer error occurs with the designated special module.

•

When the number of words transferred exceeds 256 words.

•

When the source table of transfer is out of the valid range.

•

When the destination table of transfer is out of the valid range.

TOSHIBA CORPORATION

Industrial Equipment Department

1-1, Shibaura 1-chome, Minato-ku

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Key features

RS-232C or RS-422 interface
Two independent communication channels
Asynchronous data transmission
Data exchange using ASCII code
Buffer memory for message storage
Status LEDs for monitoring operation
Self-diagnosis and error checking
Hot and cold reset options
Trailing code customization
Time-out check for reliable reception

Frequently asked questions

The maximum length of a message is 896 bytes.

You can change the trailing code by writing the desired code into address 24 (for channel 1) or 88 (for channel 2) of the AS311’s buffer memory, then writing the hot reset command (HFE) into address 12 of the buffer memory.

The default setting is 1 second (10 in 0.1 s units). You can change it by writing the new value into address 25 (for channel 1) or 89 (for channel 2) of the AS311’s buffer memory, followed by the hot reset command (HFE) at address 12.

You can reset the AS311 to its default settings by writing the cold reset command (HFF) into address 12 of the AS311’s buffer memory.

The AS311 can store error codes related to receiving and transmitting messages. See section 6.2.3 for receiving errors and section 6.2.4 for transmitting errors in the manual.