Autonics ARM Series, User Manual, Page: 14 / 28

1 Modbus RTU protocol
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1.6 Preset Single Registers(Func 06–06H)
Writes the Binary data of single Holding Registers (4X reference) in Slave device.
(1) Query (Master)
Slave Address Function
Register Address Preset Data(Data) Error Check(CRC16)
Hi(Upper) Lo(Lower) Hi(Upper) Lo(Lower) Lo(Lower) Hi(Upper)
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
(2) Response (Slave)
Slave Address Function
Register Address Preset Data(Data) Error Check(CRC16)
Hi(Upper) Lo(Lower) Hi(Upper) Lo(Lower) Lo(Lower) Hi(Upper)
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
If writing “10(A H)” to Holding Register 400001(0000 H) on Slave(Address 17) from Master.

Query (Master)
Slave Address Function
Starting Address Preset Data(Data) Error Check(CRC16)
Hi(Upper) Lo(Lower) Hi(Upper) Lo(Lower) Lo(Lower) Hi(Upper)
11 H 06 H 00 H 00 H 00 H 0A H ## H ## H

Response (Slave)
Slave Address Function
Starting Address Preset Data(Data) Error Check(CRC16)
Hi(Upper) Lo(Lower) Hi(Upper) Lo(Lower) Lo(Lower) Hi(Upper)
11 H 06 H 00 H 00 H 00 H 0A H ## H ## H
CRC16
CRC16