Toho-electronics TTM000 Instrukcja Użytkownika Pobierz pdf (Strona 21)

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

1BH

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

High

level

6.3.2 Composition of a write request message

Slave address

03H

Function code

10H

High level

00H

First register address

Low level

C0H

Number of registers

High level

00H

Fixed at 2

Low level

02H

Number of data items

04H

Number of registers

Data for the first register

(a low-level word)

High level

00H

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

6FH

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

6.3.3 Composition of a store request message

Slave address

03H

Function code

10H

High level

02H

First register address

Low level

0EH

Number of registers

High level

00H

Fixed at 2

Low lev

02H

Number of data items

04H

Number of registers

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 + 1

(a high-level word)

gh level

00H

Low level

00H

CRC-16

Low

level

High

level

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 41 42

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