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ProSoft Technology 5202-DFNT-MCM4 User Manual

Page 63

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Reference MCM

♦ ProLinx Gateway

Driver Manual

Modbus Master/Slave


ProSoft Technology, Inc.

Page 63 of 80

October 16, 2009

8.1.6 Preset Single Register (Function Code 06)

Query

Function (06) allows the user to modify the contents of a holding register. Any
holding register that exists within the controller can have its contents changed by
this message. However, because the controller is actively scanning, it also can
alter the content of any holding register at any time. The values are provided in
binary up to the maximum capacity of the controller unused high order bits must
be set to zero. When used with Slave address zero (Broadcast mode) all Slave
controllers will load the specified register with the contents specified.

NOTE Functions 5, 6, 15, and 16 are the only messages that will be recognized as valid for
broadcast.

Adr

Func

Data Start Reg

Hi

Data Start Reg

Lo

Data #of Regs Hi Data #of Regs Lo

Error Check Field

11 06

00

01

00

03

CRC

Response

The response to a preset single register request is to re-transmit the query
message after the register has been altered.

Adr

Func

Data Reg Hi Data Reg Lo

Data Input Reg Hi

Data Input Reg Lo

Error Check Field

11 06

00

01

00

03

CRC