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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, 15 and 16 are the only messages that are recognized as valid
for broadcast.
Example. Write the value 500 to holding register address 104 (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 104, the offset address 103 (67H) is transmitted.
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
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