Toho-electronics TTM200 Manual de usuario descargar pdf (Pagina 19)

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

01H

Function code

03H

Number of byte items

04H

Number of registers  2

Data for the first register

(a low-level word)

High level

0AH

③

Data composition is ①, ②, ③,

and ④H. (① represents 1

byte.)

Low level

A1H

④

Data for the first register

(a high-level word)

High level

00H

①

Low level

00H

②

CRC-16

Low level

09H

High level

A8H

6.4.2 Response message for a write/store request message

Slave address

01H

Function code

10H

High level

01H

First register address

Low level

00H

Number of registers

High level

00H

Fixed at 2

Low level

02H

CRC-16

Low level

34H

High level

40H

6.4.3 Response message in the case of an error

Slave address

01H

Function code

83H

 In the case of an error, the function

for the request message + 80H is

entered.

Error code

03H

CRC-16

Low level

31H

High level

01H

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 50 51

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Toho-electronics TTM200 Manual de usuario Pagina 19

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