LUMEL RE15 Microprocessor Controller User’s Manual

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MICROPROCESSOR

CONTROLLER

RE15

SERIAL INTERFACE

WITH MODBUS PROTOCOL

USER’S MANUAL

CONTENTS

1. PREFACE ............................................................................... 4

2. DESCRIPTION OF THE MODBUS PROTOCOL .................... 4

2.1. ASCII framing ................................................................. 6

2.2. RTU framing ................................................................... 6

2.3. Characteristic of frame fields ....................................... 7

2.4. LRC checking ................................................................ 9

2.5. CRC checking ................................................................ 9

2.6. Character format in series transmission .................... 10

2.7. Transaction interruption .............................................. 10

3. DESCRIPTION OF FUNCTIONS .......................................... 11

3.1. Readout of N-registers (Code 03) .............................. 11

3.2. Writing of values into the register (Code 06) ............. 12

3.3. Writing into N-registers (Code 16) .............................. 13

3.4. Report identifying the device (Code 17) ..................... 13

4. ERROR CODES .................................................................... 15

5.TABLE OF REGISTERS FOR THE RE15 CONTROLLER ..... 17

AFFIX A. CALCULATION OF THE CHECKSUM .................... 23

1. PREFACE

•

The RE15 microprocessor controller destined to measure and control physical quantities is provided with a serial interface in

RS-485 standard for the communication with other devices.

The asynchronous communication MODBUS protocol has been implemented on this serial interface.

The configuration of serial interface parameters has been described in the Users Manual of the R15 controller.

Composition of serial interface parameters concerning RE15 controller:

•

Controller address

•

Baud rate

•

Working modes

•

Information unit

Maximal turnaround time

- 1 ... 247

- 2400, 4800, 9600 bits/s,

- ASCII, RTU,

- ASCII: 8N1, 7E1, 7O1;

and RTU: 8N2, 8E1, 8O1,8N1

- 1s

Explanation of some abreviations:

ASCII = American Standard Code

for Information Interchange

RTU = Remote terminal Unit

LRC = Longitudinal Redundancy Check

CRC = Cyclic Redundancy Check

CR = Carriage Return

LF = Line Feed (Character)

MSB = Most Significant Bit

Checksum = Control Sum

2. DESCRIPTION OF THE MODBUS PROTOCOL

The MODBUS interface is a standard adopted by manufacturers of industrial controllers for an asynchronous character exchange of information between different devices of measuring and control systems. It has such features as:

v Simple access rule to the link based on the master-slave principle, v Protection of transmitted messages against errors, v Confirmation of remote instruction realisation and error signalling, v Effective actions protecting against the system suspension, v Taking advantage of the asynchronous character transmission.

Programmable controllers working in the MODBUS system can communicate with each other, taking advantage of the master-slave protocol type, in which only one device (the master - superior unit) can originate transactions (called

queries), and others (slaves subordinate units) respond only to the remote query by supplying the requested data to the master. The transaction is composed of the transmitted command from the master unit to the slave unit and of the response transmitted in the opposite direction. The response includes data demanded by the master or the realised confirmation of its command. Master can transmit information to individual slaves, or broadcast messages destined for all subordinate devices in the system (responses are not returned to broadcast queries from the master).

The format of transmitted information is as follows:

master => slave: device address, code representing the required command, data to be sent, control word protecting the transmitted message,

slave => master: sender address, confirmation of the command realization, data required by the master, control word protecting the response against errors.

If the slave device detects an error when receiving a message, or cannot realize the command, it prepares a special message about the error occurrence and transmits it as a response to the master.

Devices working in the MODBUS protocol can be set into the communication using one of two transmission modes: ASCII or RTU.

The user chooses the required mode, along with the serial port

parameters (baud rate, information unit) during the configuration of any device.

In the MODBUS system, transmitted messages are placed into frames that are no related to serial transmission. These frames have a defined beginning and end. This enables for the receiving device to reject incomplete frames and the signalling of related errors with them.

Taking into consideration the possibility to operate in one of these two different transmission modes (ASCII or RTU), two frames have been defined.

2.1. ASCII framing

In the ASCII mode each byte of information is transmitted as two

ASCII characters.

The basic feature of this mode is that it allows to long intervals between characters within the message (to1sec) without causing errors.

A typical message frame is shown below:

Start beginning index

1 char :

Address Function

2 chars 2 chars

Data LRC check

End index n chars 2 chars 2 chars CR LF

In ASCII mode, messages start with a colon character (: -ASCII

3Ah) and end with a carriage return-line feed (CR and LF characters). The frame information part is protected by the LRC code

(Longitudinal Redundancy Check).

2.2. RTU Framing

In RTU mode, messages start and end with an interval lasting minimum 3.5 x (lasting time of a single character), in which a silence reigns on the link.

The simplest implementation of the mentioned time interval character is a multiple measure of the character duration time at the

set baud rate accepted on the link.

The frame format is shown below:

Start bedinning index

T1-T2-T3-T4

Address Function Data CRC check

End index

8 bits 8 bits n x 8 bits 16 bits T1-T2-T3-T4

Start and end indexes are marked symbolically as an interval equal to four lengths of the index (information unit). The checking code consists of 16 bits and emerges as the result of CRC calculation

(Cyclical Redundancy Check) on the frame contents.

2.3. Characteristic of frame fields

Address field

The address field of a message frame contains two characters

(in ASCII mode) or eight bits (in RTU mode).

Valid slave device addresses are in the range of 0-247 decimal. The master addresses the slave units by placing the slave address in the frame address field. When the slave sends its response, it places its own address in the frame address field what enables the master to check which slave is responding. The 0 address is used as a broadcast address recognized by all slave units connected to the bus.

Function field

The function code field of a message frame contains two characters (in ASCII mode) or eight bits (in RTU mode). Valid codes are in the range of 1-255 decimal. When a message is sent from a master to a slave device, the function code field tells the slave what kind of action to perform. When the slave responds to the master, it uses the function code field to indicate and confirm either a normal

(error-free) response or that some kind of error occurred and the realization of the command is impossible.

For a formal response the slave simply echoes the original function code. In case of an error assertion, the slave returns a special code that is equivalent to the original function code with its most

significant logic 1. The error code is placed on the data field of the response frame.

Data field

The data field is constructed using sets of two hexadecimal digits, in the range of 00 - FF hexadecimal.

These can be made from a pair of ASCII characters or from one

RTU character, according to the networks serial transmission mode.

The function code range is 1-255. The data field of messages sent from a master to slave devices contains additional information which the slave must use to take the action defined by the function code.

This can include items like discrete and register addresses, the quantity of items to be handled, and count of actual data bytes in the field, a.s.o. The data field can be non-existent (of zero length) in certain kinds of frames. That occurs always when the operation defined by the code does not require parameters.

Error checking field

Two kinds of error-checking methods are used for standard

MODBUS networks. The error checking field contents depends upon the applied transmission mode.

When ASCII mode is used for character framing, the error checking field contains two ASCII characters. The error check characters are the result of a Longitudinal Redundancy Check (LRC) calculation that is performed on the message contents

(exclusive of the beginning colon and terminating CRLF characters). LRC characters are appended to the message as the last frame field preceding the end markers (CR, LF).

When RTU mode is used for character framing, the error checking field contains a 16-bit value implemented as two 8-bit bytes. The error check value is the result of a Cyclical Redundancy Check

Calculation (CRC) performed on a message contents. The CRC field is appended to the message as the last field in the message. When this is done, the low-order byte of the field is appended first, followed by the high-order byte. The CRC high-order byte is the last byte to be sent in the message.

2.4. LRC checking

The LRC is calculated by adding together successive 8-bit bytes of the message, discarding any carries, and then two is complementing the result. It is performed on the ASCII message field contents excluding the ,,colon character that begins the message, and excluding the CR, LF pair at the end of the message. The 8-bit value of the LRC sum is placed at the frame end as two ASCII characters, first the character containing the higher tetrad, and after it, the character containing the lower LRC tetrad.

2.5. CRC checking

The generating procedure of CRC is realised according the following algorythm:

1. Load a 16-bit register with FFFFh. Call this the CRC register.

2. Take the byte from the data block and execute the EXOR operation with the low-order byte of the CRC register. Place the result into the CRC register.

3. Shift the CRC register contents one bit to the right (towards the

LSB), write 0 on the most significant bit (MSB=0).

4. Check the state of the lowest order bite (LSB) extracted from the CRC register in the previous step. If its state is equal 0, then follows a return to the step 3 (another shift).

If the LSB is equal 1, the operation EXOR of the CRC register is executed with the polynomial value A001h.

5. Repeat steps 3 and 4 until 8 shifts have been performed. When this is done, a complete 8-bit byte will have been processed.

6. Repeat steps 2 through 5 for the next 8-bit byte of the message.

Continue doing this until all bytes of the message have been processed.

7. The final contents of the CRC register is the searched CRC value.

8. When the CRC is placed into the message, its upper and lower bytes must be swapped as described below.

2.6. Character format during serial transmission

In the MODBUS protocol, characters are transmitted from the lowest to the highest bit.

Organization of the information unit in the ASCII mode: v v v v

1 start bit,

7 data field bits,

1 even parity check bit (odd) or lack of even parity check bit,

1 stop bit at even parity check or 2 stop bits when lack of even parity check.

v v v v

Organization of the information unit in the RTU mode:

1 start bit,

8 data field bits,

1 even parity check bit (odd) or lack of even parity check bit,

1 stop bit at even parity check or 2 stop bits when lack of even parity check.

2.7. Transaction interruption

In the master unit the user sets up the important parameter which is the maximal response time on the query frame after which exceeding, the transaction is interrupted. This time is chosen such that each slave unit working in the system (even the slowest) normally will have the time to answer to the frame query.

An exceeding of this time attests therefore about an error and such treated by the master unit.

If the unit slave will find out a transmission error it does not accomplish the order and does not send any answer. That causes an exceeding of the waiting time after the query frame and the transaction interruption.

In the R15 controller maximal response time on the query frame is equal 1 s.

3. FUNCTION DESCRIPTION

In the R15 controller following protocol functions have been implemented:

Code

Signification

Reading of n-register

Writing of an individual register

Writing of n-registers

Slave device identification

3.1. Reading of n-registers (code 03)

Demand:

The function enables the reading of values included in registers in being addressed slave device. Registers are 16 or 32-bit units, which can include numerical values bounded with changeable processes, and the like. The demand frame defines the 16-bit start address and the number of registers to read-out.

The maximal number of registers read out by one command is 128 for the RE15 controller.

The signification of the register contents with address data can be different for different device types. The function is not accessible in the broadcast mode.

The function is not accessible in the broadcasting mode.

Example: Reading of 3 registers beginning by the register with the

6Bh address.

Address Funtion Register Register Number of Number of Checksum

Address Hi Address Lo registers Hi registers Lo

11 03 00 6B 00 03 7E LRC

Answer:

Example: the answer frame

Adres Function Number Value of bits in the

Value Value in the in the

Value Value Value Checksum in the in the in the regist.

regist.

107 107 108 108 109 109

Hi Lo Hi Lo Hi Lo

11 03 06 02 2B 00 00 00 64 55 LRC

3.2. Writing of values in the register (code 06)

Demand:

The function enables the modification of the register contents is accessible in broadcast mode.

Example:

Address Function Register address Hi

Register address Lo

Value

Checksum

11 06 00 87 03 9E C1 LRC

Answer:

The correct answer to a value record demand in the register is the retransmission of the message after accomplishing the operation.

Example:

Address Function Checksum

11 06

Register address Hi

Register address Lo

Value

9E C1 LRC

3.3. Writing in n-registers (code 16)

Demand:

The function is accessible in broadcast mode. It enables the modification of the register contents. The maximal number of registers read out by one command is 128 for RE15 controller.

Example: Writing of two registers beginning from the register addressed 136.

Address Function Regist. Regist. Number Number Number Data Data Data Data Checksum address address of of of Hi Lo Hi Lo

Hi Lo regist.

Hi regist.

Lo bytes

11 10 00 87 00 02 04 00 0A 01 02 45

LRC

Answer:

The correct answer includes the unit slave address, function code, starting address and the number of recorded registers.

Example:

Address Function Register Register Number of Number of Checksum address Hi address Lo registers Hi registers Lo

11 10 00 87 00 02 56 LRC

3.4. Report identifying the device (code 17)

Demand:

This function enables the user to obtain information about the device type, status and configuration depending on this.

Example:

Address Function Checksum

11 11 DE LRC

Answer:

The field ,,Device identifier in the answer frame means the unique identifier of this class of device, however the other fields include

parameters depended on the device type.

The RE15 controller gives information related to additional inputs and outputs.

Example concerning the RE15 controller

Slave address

Function Number Device Type of of bytes identifier additional input

11 4 68 xx

Type of Execution Checksum output number

XX - value as in the controller execution code - Item related with the additional input

YY - four discontinuous output,

1 - one continuous output + three discontinuous outputs

2 - two continuous outputs + two discontinuous outputs

0 - for standard execution, different from 0, for custom-made executions.

4. ERROR CODES

When the master device is broadcasting a demand to the slave device then, except for messages in the broadcast mode, it expects a correct answer. After sending the demand of the master unit, one of the four possibilities can occur: v

If the slave unit receives the demand without a transmission error and can execute it correctly, then it returns a correct answer, v v

If the slave unit does not receive the demand, no answer is returned. Timeout conditions for the demand will be fulfilled in the master device program.

If the slave unit receives the demand, but with transmission errors (even parity error of checking sum LRC or CRC), no answer is returned. Timeout condition for the demand will be fulfilled in the master device program.

v v

If the slave unit receives the demand without a transmission error but cannot execute it correctly (e.g. if the demand is, the reading-out of a non-existent bit output or register), then it returns the answer including the error code, informing the master device about the error reason.

A message with an incorrect answer includes two fields distinguishing it from the correct answer.

The function code field:

In the correct answer, the slave unit retransmits the function code from the demand message in the field of the answer function code.

All function codes have the most-significant bit (MSB) equal zero

(code values are under 80h). In the incorrect answer, the slave unit sets up the MSB bit of the function code at 1. This causes that the function code value in the incorrect answer is exactly of 80h greater than it would be in a correct answer.

On the base of the function code with a set up MSB bit the program of the master device can recognize an incorrect answer and can check the error code on the data field.

The data field:

In a correct answer the slave device can return data to the data field

(certain information required by the master unit). In the incorrect answer the slave unit returns the error code to the data field. It defines conditions of the slave device which had produced the error.

An example considering a demand of a master device: read out 4520 register (11A8h) and the answer of the slave unit: forbidden data address, because the maximal register address in the RE15 controller is 4519.

Data are in the hexadecimal shape.

Example: demand

Slave address

Function

Variable address

Number of Number of Checksum variables variables

Hi Lo

00 01 39 LRC

Example: answer

Address Function Error

0A 83 02

Checksum

71 LRC

Possible error codes and their meanings are shown in the table below.

Code

Meaning

Forbidden function

Forbidden data address

Forbidden data value

5. TABLE OF REGISTERS FOR THE RE15 CONTROLLER

In the RE15 controller data are placed in 16-bit registers.

Bits in the register are numbered from the lowest to the highest one

(b0-b15).

The list of registers are presented in the tabel 1.

Symbols R, W in the Option column signify allowable actions on the controller data: R-readout, W-writing.

Table 1. Contents of 16-bit registers

Regist. Option Symbol address

Range Description

4000 R,W inpu 0...16

4001 R,W t_lj 0, 1

Output type: 0-PT100, 1-PT1000, 2-Ni100, 3-Cu100, 4-J,

5-T, 6-K, 7-S, 8-R, 9-B, 10-E, 11-N, 12-Chromel-copel,

13-resistance 0...400 W,14-0...20 mA, 15-4...20 mA,

16-0...10V, 17- 0...5V

0- 2-wire line, 1- 3-wire line

4002 R,W r_lj 0...200

Resistance of the line*10

4003 R,W Conp -1...501

4004 R,W Lcpp 0, 1, 2

Compensation of cold ends*10, ; values <0 or >500 mean automatic compensation

Number of digits after coma (value 2 for linear inputs)

4005 R,W Shjf -999...999

Shift of measured value

4006 R,W spll -999...splH Lower range of the measured value on the main input

4007 R,W splH Spll...9999 Upper range of the measured value on the main input

4008 R,W J2lo -999...J2Hj Lower range of the measured value on the additional input

4009 R,W J2Hj J2lo...9999 Upper range of the measured value on the additional input

4010 R,W Jnp 0...5

4011

4012

R,W Fjn 0...4

R,W Fjnb 0...3

Range of the additional input: 0-0...20 mA; 1-4...20 mA;

2-0...10 V ; 3-0...5 V; 4-0...100 W; 5-0...1000 W;

0 - set value (rsp = inp2); 1- extra information measurement; 2- sum of signals from both inputs;

3 - difference with main input; 4- arythmetical mean from both inputs

Function of the binary input: 0-no used binary input;

1- stops the control (control signal=0); 2- switch over to the manual work, 3- program end; 4- program stopped on the value counted lately

4013 R,W

4014 R,W

4015 R,W

4016 R,W

4017 R,W

4018 R,W

4019 R,W

4020 R,W

4021 R,W

Ouc

Out

Bar

Bar rsp

0...3

0...18

0...4

0, 1, 2

4022 R,W sp Depends on the input

4023 R,W naro 0...999

4024 R,W Nrpr 1...15

4025 W

0, 1, 2

0, 1

4026 R,W Pb 0...9999

4027 R,W Tj 0...3600

4028 R,W Td

4029 R,W To

0...1000

1...250

4030 R,W H 0...999

4031 R,W pb-c 0...9999

4032 R,W Tj-c 0...3600

4033 R,W Td-c 0...1000

4034 R,W to-c 1...250

4035 R,W Hj-c 0...999

4036 R,W Hn 0...999

4037 R,W typr 0,1

4038 R,W y-of 0...1000

Range of the continuous output no I: 0-0-20 mA for current outputs; 1-4-20 mA ; 2-0-10 V ; 3-0-5 V

Range of the continuous output no II: as above

Output function no 1: 0-no used, 1-Y1, 2-Y2-c, 3-Y2-S,

4-ahi, 5-alo, 6-dbhi, 7-dblo, 8-dbhl, 9-dbin,

10-Ahi2, 11-Alo2, 12-Eout, 13-EoP, 14-Err1,

15-Err2, 16-tri1, 17-tri2, 18-trsp

Output function no 2: as above

Output function no 3: as above

Output function no 4: as above

Bargraph function no 1: 0- control signal Y1 0...100%;

1-control signal Y2 0...100%; 2-signal from the main input spll...splh; 3-signal from the additional input i2Lo...i2Hi; 4-set value spll...splh

Bargraph function no 2: as above

Kind of set value, 0- constant value, 1- programmed,

2- from the additional input

Set value for the constant control

Change speed of the set value during the soft-start*10

Program number executed for the programmed control

Control of the program work:0-stop, 1-continue,

2-start from the beginning

Proportional band for the main line*10

Integration time-constant

Differentiation time-constant

Cycle time

Hysteresis for on-off control

Proportional band for the auxiliary line*10

Integration time-constant for the auxiliary line

Differentiation time-constant for the auxiliary line

Cycle time for the auxiliary line

Hysteresis for on-off control of the auxiliary control

Dead band for three-state control

Kind of control: 0: inverse, 1- direct

Correction of the control signal *10 (for the integration time-constant ti=0)

4039 R,W 1asp for sp

4040 R,W 1aHj 0...999

4041 R,W 1apa 0,1

4042 R,W 2asp for sp

Set value for the alarm on the output 1

Hysteresis for the alarm on output 1

Storage of alarm no 1: 0-off, 1-on

Set value for the alarm on the output 2

4043 R,W

4044 R,W

4045 R,W

2aHj 0...999

2apa 0,1

3asp for sp

4046 R,W 3aHj 0...999

4047 R,W 3apa 0,1

4048 R,W 4asp for sp

Hysteresis for the alarm on output 2

Storage of alarm no 2: 0-off, 1-on

Set value for the alarm on the output 3

Hysteresis for the alarm on output 3

Storage of alarm no 3: 0-off, 1-on

Set value for the alarm on the output 4

4049 R,W 4aHj 0...999

Hysteresis for the alarm on output 4

4050 R,W

4052 R,W

4053 R,W

4apa 0,1 cont 0,1

Auto 0,1,2

4054... R,W lcyc 1...99

4773 address of each R,W

R,W bloh 0...999

Cont 0,1

Storage of alarm no 4: 0-off, 1-on

Index of the constant control continuation after the supply switching on, 0-control off, 1- control on

Self-adaptation algorythm: 0-without self-adaptation,

1-identyfying method, 2-oscillation method

Number of program cycles p

Blocking value in the program p

Continuation of the program p after the supply decay:

0-stop, 1-continue, the register number r for the program p is equal: r =(p-1)*48+4056

R,W naxx, 0...999

Change rate of the set value on the segment xx *10

The register number r for program p of the segment x is equal: r =(p-1)*48+(x-1)*3+4057

R,W SPxx Range deSet value on the end of the segment

, when the change rate > 0 or tixx pends on the or hold time , when the change rate=0; input 0...999 The register number r for program p of the segment x is equal: r =(p-1)*48+(x-1)*3+4058

R,W eoxx 0,1 blxx, 0,1

Output y in the segment xx (bit y-1): 1-output on,

0-output off.

Index for the active deadlock in the segment xx (bit 4) xxx1xxx-1, 1-on, 0-off

The number of the register r for the program p of the segment x is equal: r = (p-1)*48+(x-1)*3+4059

4774 R

4775 R

4776 R

4777 R

4778 R

4779 R

4780 R

4781 R h c n

0...1000

0...15

Device state: bit 0: 1- measured value on the main input is below the lower input range or input short-circuiting bit 1: 1- measured value on the main input is over the upper input range or input opening bit 2: 1- measured value on the additional input is below the lower input range bit 3: 1- measured value on the additional input is over the upper input range bit 4: output state no 1: 0-off, 1-on bit 5: output state no 2: 0-off, 1-on bit 6: output state no 3: 0-off, 1-on bit 7: output state no 4: 0-off, 1-on bit 8: 1- manual control, 0- automatic control bit 9: 1-change of the set value, i.e. Soft-start bit 10: 1- programmed control, 0- constant control bit 11: 1- program execution, 0- program stopped bit 12: 1- program blocking because of a too high deviation bit 13: binary input state: 0- open, 1- short-circuited bit 14 and 15: position of decimal point:

00- without decimal point,

01- decimal on the position 1

10- decimal on the position 2 (see ref.

)

Measured value on the input no 1

Measured value on the input no 2

Controlled value

Set value (actual value)

Control value of the line I *10

Control value of the line II *10

Number of the segment currently executed for the programmed control

Time remaining to the segment end

Number of program cycles remaining to the end

4782 R

4783 R t

1) the value is multiplied by the multiplier depending on the parameter value lcpp (position of the decimal point), i.e.: when lcpp=0, then the multiplier =1; when lcpp=1, then the multiplier = 10; when lcpp=2, then the multiplier = 100.

In the table 2 all register addresses including data of 15 programs are given. To each register address one must add 4000.

Eout+blok nA 4

SP4 or ti4

Eout+blok nA 5

SP5 or ti5

Eout+blok nA 6

SP6 or ti6

Eout+blok nA 7

SP7 or ti7

Eout+blok nA 8

LCYC

Bloh cont nA 1

SP2 or ti1

Eout+blok nA 2

SP2 or ti2

Eout+blok nA 3

SP3 or ti3

SP8 or ti8

Eout+blok

Table 2.

Parameter

1 2 3 4 5 6 7

Program

8 9 10 11 12 13 14 15

54 102 150 198 246 294 342 390 438 486 534 582 630 678 726

55 103 151 199 247 295 343 391 439 487 535 583 631 679 727

56 104 152 200 248 296 344 392 440 488 536 584 632 680 728

57 105 153 201 249 297 345 393 441 489 537 585 633 681 729

58 106 154 202 250 298 346 394 442 490 538 586 634 682 730

59 107 155 203 251 299 347 395 443 491 539 587 635 683 731

60 108 156 204 252 300 348 396 444 492 540 588 636 684 732

61 109 157 205 253 301 349 397 445 493 541 589 637 685 733

62 110 158 206 254 302 350 398 446 494 542 590 638 686 734

63 111 159 207 255 303 351 399 447 495 543 591 639 687 735

64 112 160 208 256 304 352 400 448 496 544 592 640 688 736

65 113 161 209 257 305 353 401 449 497 545 593 641 689 737

66 114 162 210 258 306 354 402 450 498 546 594 642 690 738

67 115 163 211 259 307 355 403 451 499 547 595 643 691 739

68 116 164 212 260 308 356 404 452 500 548 596 644 692 740

69 117 165 213 261 309 357 405 453 501 549 597 645 693 741

70 118 166 214 262 310 358 406 454 502 550 598 646 694 742

71 119 167 215 263 311 359 407 455 503 551 599 647 695 743

72 120 168 216 264 312 360 408 456 504 552 600 648 696 744

73 121 169 217 265 313 361 409 457 505 553 601 649 697 745

74 122 170 218 266 314 362 410 458 506 554 602 650 698 746

75 123 171 219 267 315 363 411 459 507 555 603 651 699 747

76 124 172 220 268 316 364 412 460 508 556 604 652 700 748

77 125 173 221 269 317 365 413 461 509 557 605 653 701 749

78 126 174 222 270 318 366 414 462 510 558 606 654 702 750

79 127 175 223 271 319 367 415 463 511 559 607 655 703 751

80 128 176 224 272 320 368 416 464 512 560 608 656 704 752

nA 9

SP9 or ti9

Eout+blok nA10

SP10 or ti10

Eout+blok nA11

SP11 or ti11

Eout+blok

NA12

SP12 or ti12

Eout+blok nA13

SP13 or ti13

Eout+blok nA14

SP14 or ti14

Eout+blok nA15

SP15 or ti15

Eout+blok

81 129 177 225 273 321 369 417 465 513 561 609 657 705 753

82 130 178 226 274 322 370 418 466 514 562 610 658 706 754

83 131 179 227 275 323 371 419 467 515 563 611 659 707 755

84 132 180 228 276 324 372 420 468 516 564 612 660 708 756

85 133 181 229 277 325 373 421 469 517 565 613 661 709 757

86 134 182 230 278 326 374 422 470 518 566 614 662 710 758

87 135 183 231 279 327 375 423 471 519 567 615 663 711 759

88 136 184 232 280 328 376 424 472 520 568 616 664 712 760

89 137 185 233 281 329 377 425 473 521 569 617 665 713 761

90 138 186 234 282 330 378 426 474 522 570 618 666 714 762

91 139 187 235 283 331 379 427 475 523 571 619 667 715 763

92 140 188 236 284 332 380 428 476 524 572 620 668 716 764

93 141 189 237 285 333 381 429 477 525 573 621 669 717 765

94 142 190 238 286 334 382 430 478 526 574 622 670 718 766

95 143 191 239 287 335 383 431 479 527 575 623 671 719 767

96 144 192 240 288 336 384 432 480 528 576 624 672 720 768

97 145 193 241 289 337 385 433 481 529 577 625 673 721 769

98 146 194 242 290 338 386 434 482 530 578 626 674 722 770

99 147 195 243 291 339 387 435 483 531 579 627 675 723 771

100 148 196 244 292 340 388 436 484 532 580 628 676 724 772

101 149 197 245 293 341 389 437 485 533 581 629 677 725 773

APPENDIX A

CALCULATION OF THE CHECKSUM

In this appendix some examples of function in the C language calculating the LRC checksum for ASCII mode and the CRC checksum for the RTU mode have been shown.

The function for LRC calculation has two arguments: unsigned char *outMsg; Pointer for the communication buffer, including binary data from which one must calculate LRC.

unsigned short usDataLen; Number of bytes in the communication buffer.

The function returns LRC of unsigned char type.

}

{ static unsigned char LRC(outMsg, usDataLen) unsigned char *outMsg; /* buffer to calculate LRC */ unsigned short usDataLen; /* number of bytes in the buffer */ unsigned char uchLRC = 0; /* initialization of LRC */ while (usDataLen- -) uchLRC += *outMsg++; /* add the buffer byte without transfer */ return ((unsigned char)(-(char uchLRC))); /* return the sum in the completion code up two */

An example of function in C language calculating the CRC sum is presented below. All possible values of CRC sum are placed in two tables.

The first table includes the highest byte of all 256 possible values of the 16-bit CRC field, however the second table includes the lowest byte.

The assignment of the CRC sum through table indexing is further more rapid than the calculation of a new CRC value for each sign of the communication buffer.

Note: The below function represents bytes of the sum

CRC higher/lower, and this way the CRC value returned by the function can be directly placed in the communication buffer.

The function serving to calculate CRC has two arguments: unsigned char *puchMsg; Pointer for the communication buffer, including binary data from which one must calculate LRC.

unsigned short usDataLen; Number of bytes in the communication buffer.

The function returns CRC of unsigned short type.

} unsigned short CRC16(puchMsg, usDataLen) unsigned char *puchMsg; /* buffer to calculate CRC */

{ unsigned short usDataLen; /* Number of bytes in the buffer */ unsigned char uchCRChi = 0xFF; /* initialisation of the higher CRC byte CRC */ unsigned char uchCRClo = 0xFF; /* initialisation of the lower CRC byte */ while (usDataLen- -)

{ uIndex =uchCRChi ^ *puchMsg++; /* CRC calculation */ uchCRChi = uchCRClo ^ crc_hi[uIndex]; uchCRClo = crc_lo[uIndex];

} return(uchCRChi<<8 | uchCRClo);

//table of the older CRC byte const unsigned char crc_hi[ ]={

//table of the lower CRC byte const unsigned char crc_lo[ ]={

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