Toho-electronics TTM000 Manuel d'utilisateur télécharger pdf (Page 22)

6.4 Composition of an RTU response message

(transmitted from this product to a high-level computer)

For codes a) through h), see "6.5 Description of RTU codes."

6.4.1 Response message for a read request message

Slave address

1BH

Function code

03H

Number of data items

04H

Number of registers

Data for the first register

(a low-level word)

High level

03H

③

When writing

①

②

③

, and

④

H in the data, write them in the

order described on the left-hand

side. (① represents 1 byte.)

Low level

09H

④

Data for the first register + 1

(a high-level word)

High level

00H

①

Low level

00H

②

CRC-16

Low

leve

High

level

6.4.2 Response message for a write/store request message

Slave address

03H

Function code

10H

High level

00H

First register address

Low level

00H

Number of registers

High level

00H

Fixed at 2

Low level

02H

CRC-16

Low

level

High

level

6.4.3 Response message in the case of an error

Slave address

1BH

Function code

83H

In the case of an error, the function

code for the request message + 80H is

entered.

Error

code

02H

CRC-16

Low

level

High

level

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 41 42

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Toho-electronics TTM000 Manuel d'utilisateur Page 22

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