Despatch Protocol Plus Modbus Communications User Manual

Page 32

Chromalox Instruments and Controls

A-51643 Rev. 6 10/06/03

Field Name

Data

Slave address

$0E

Function

$06

$00

$01

Data hi

$00

Data lo

$03

CRC

$----

Response

The normal response is an echo of the query, returned after the register has been written.

Example response:

Field Name

Data

Slave address

$0E

Function

$06

$00

$01

Data hi

$00

Data lo

$03

CRC

$----

5.2.6

[16] Write Multiple Registers

Class 0 command. Write values into a sequence of holding registers. When broadcast, the values are

written to the same register references in all slaves on the network. Use of broadcast with this command

should be used with caution as the registers addressed may differ in function on each slave device in the

network.

Note: The written values will remain valid until the controller‘s next write to the register through its

keypad or internal logic.

Query

The query message specifies the register references to be written. Registers are addressed starting at zero.

The number of registers to be written are transmitted in two bytes (one word) with the first byte being the