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…5 MODBUS FUNCTIONS
5.4 Preset Single Register – Function Code 06
5.4.1 Preset Single Register Query
The Preset Single Register Query modifies the contents of a holding register.
Note. Function codes 05, 06 and 16 are the only messages that are
recognized as valid for broadcast.
Example. Write the value 500 to holding register address 25 (proportional band 1
– heat) in slave 01.
Note. To write to a register, its offset address (one less than the register
number) must be used, e.g. to write to register 25, the offset address 24 (18H)
is transmitted.
Register Register Data Data Error
Address Function Offset Offset Value Value Check (CRC-16)
High Low High Low Field
01 06 00 18 01 F4 09 DA
5.4.2 Preset Single Register Response
The response to a Preset Single Register Response requests is to retransmit the
query message after the register has been altered.
Example
Register Register Data Data Error
Address Function Offset Offset Value Value Check (CRC-16)
High Low High Low Field
01 06 00 18 01 F4 09 DA
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