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Modbus RTU Function Codes

02/13 Modbus® RTU Serial Communications User Manual 19

3.5 Function Codes 06 – Preset Single Register

Description

Presets an integer value into a single register (4X references). When broadcasted, the function presets the

same register references in all attached slaves.

The specific supported registers available in an instrument via a Function Code 06 message may be

instrument-model specific. However, every instrument that supports the register assignments specified in

Appendix A with an access type “W” and integer and bit packed data types, supports writing to those

specified registers via Function Code 06.

Query

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

Query message format for function code 06

Slave

Address

Function

Code

Address

High

Address

Low

Preset

Data

High

Preset

Data

Low

CRC CRC

Example:

Set Loop #1 to Auto (address 00Fah) to a slave at address 02.

02 06 00 FA 00 01 CRC CRC

Response

The normal response is an echo of the query returned after the register contents have been preset.

Response message format for function code 06

Slave

Address

Function

Code

Address

High

Address

Low

Preset

Data

High

Preset

Data

Low

CRC CRC

Example:

Set Loop #1 to Auto (address 00Fah) to a slave at address 02.

02 06 00 FA 00 01 CRC CRC

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