English (GB)
68
12.4 Write single register (0x06)
This function is used for writing a single holding register in the
slave. The request telegram specifies the address of the register
that is to be written. Register addresses start from zero, meaning
that a register numbered 10 is addressed as 9.
The normal response is an echo of the request, indicating that the
value was written.
Example of request from master to slave
In the request, the slave with address 1 is asked to write the
value of 0xAFFE to the register at address 0x1000.
Example of response from slave to master
The response is an echo of the request.
12.5 Write multiple registers (0x10)
This function is used for writing a block of contiguous holding
registers in the slave. Register addresses start from zero,
meaning that a register numbered 100 is addressed as 99.
Example of request from master to slave
In the request, the slave with address 1 is asked to write the
value of 0x0001 to the register at address 0x0020 and the value
of 0xB0B0 to the register at address 0x0021.
Example of response from slave to master
The response returns the function code, starting address and
quantity of registers written.
Field Value
Address 0x01
Function code 0x06
Address HI 0x10
Address LO 0x00
Value HI 0xAF
Value LO 0xFE
Field Value
Address 0x01
Function code 0x06
Address HI 0x10
Address LO 0x00
Value HI 0xAF
Value LO 0xFE
Field Value
Address 0x01
Function code 0x10
Start address HI 0x00
Start address LO 0x20
Quantity HI 0x00
Quantity LO 0x02
Byte count 0x04
Register 33 HI 0x00
Register 33 LO 0x01
Register 34 HI 0xB0
Register 34 LO 0xB0
Field Value
Address 0x01
Function code 0x10
Start address HI 0x00
Start address LO 0x20
Quantity written HI 0x00
Quantity written LO 0x02
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