Despatch Protocol Plus Modbus Communications Bedienungsanleitung PDF herunterladen (Seite 33)

Chromalox Instruments and Controls

A-51643 Rev. 6 10/06/03 27

high order bits and the second byte the low order bits. Next, the actual number of data bytes is

transmitted (one byte). The requested values are specified in the query data field in two bytes (one word)

per register. The first byte represents the high order bits and the second byte represents the low order bits

of the register value.

Example: Request to preset two registers starting at register 5 to the values of 10 and 258 respectively in

slave device 14.

Field Name

Data

Slave address

$0E

Function

$10

Starting register address hi

$00

Starting register address lo

$04

Number of registers hi

$00

Number of registers lo

$02

Byte count

$04

Data hi (register 5)

$00

Data lo (register 5)

$0A

Data hi (register 6)

$01

Data lo (register 6)

$02

CRC

$----

Response

The normal response returns the slave address, function code, starting address, and quantity of registers

written.

Example response:

Field Name

Data

Slave address

$0E

Function

$10

Starting register address hi

$00

Starting register address lo

$04

Number of registers hi

$00

Number of registers lo

$02

CRC

$----

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 52 53

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