Toho-electronics TTM200 Manuel d'utilisateur télécharger pdf (Page 18)

6.3 Composition of an RTU request message (transmitted from a high-level

computer to this product)

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

6.3.1 Composition of a read request message

Slave address

01H

Function code

03H

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

0BH

High level

C4H

6.3.2 Composition of a write request message

Slave address

01H

Function code

10H

High level

00H

First register address

Low level

00H

Number of registers

High level

00H

Fixed at 2

Low level

02H

Number of byte items

04H

Number of registers  2

Data for the first register

(a low-level word)

High level

00H

③

Data composition is ①, ②, ③,

and ④H. (① represents 1

byte.)

Low level

00H

④

Data for the first register

(a high-level word)

High level

00H

①

Low level

00H

②

CRC-16

Low level

3FH

High level

FEH

6.3.3 Composition of a store request message

Slave address

01H

Function code

10H

High level

02H

First register address

Low level

0EH

Number of registers

High level

00H

Fixed at 2

Low level

02H

Number of byte items

04H

Number of registers  2

Data for the first register

(a low-level word)

High level

00H

The data about the storage of settings

is arbitrary.

Low level

00H

Data for the first register

(a high-level word)

High level

00H

Low level

00H

CRC-16

Low level

E2H

High level

EBH

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 50 51

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Toho-electronics TTM200 Manuel d'utilisateur Page 18

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