Toho-electronics TRM-006A Manual do Utilizador descarregar pdf (Página 21)

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

computer to this product)

n 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

Low level

00H

First register address

High level

00H

Number of registers

Low level

02H

Fixed at 2

High level

C6H

CRC-16

Low level

31H

6.3.2 Composition of a write request message

Slave address 03H

Function code 10H

High level

00H

Low level

C0H

First register address

High level

00H

Number of registers

Low level

02H

Fixed at 2

Number of data items 04H Number of registers × 2

High level

00H ③

Data for the first register

(a low-level word)

Low level

6FH ④

High level

00H ①

Data for the first register + 1

(a high-level word)

Low level

00H ②

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.)

High level

C4H

CRC-16

Low level

5AH

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 39 40

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