Autonics 1 Modbus RTU Protocol
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1 Modbus RTU Protocol
1.1 Read Coil Status(Func01–01H)
Read the output of ON/OFF(OX reference, Coil) status in Slave device.
1) Query(Master Side)
Slave Address Function
Starting Address No. of Points Error Check(CRC16)
High Low High Low Low High
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
2) Response(Slave Side)
Slave Address Function Byte Count Data Data Data
Error Check(CRC16)
Low High
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
If read the output status of 10EA within Coil 00001(0000 H)~00010(0009 H) on the Slave
side(Address 17) from the Master side.
Query(Master Side)
Slave Address Function
Starting Address No. of Points Error Check(CRC16)
High Low High Low Low High
11 H 02 H 00 H 00 H 00 H 0A H ## H ## H
If the values of Coil 00008(0007 H)~00001(0000 H) on Slave side are “ON-ON-OFF-OFF-
ON-ON-OFF-ON” and the values of Coil 00010(0009 H)~00009(0008 H) are “OFF-ON”.
Response(Slave Side)
Slave Address Function Byte Count
Data
(00008~00001)
Data
(00010~00009)
Error Check(CRC16)
Low High
11 H 01 H 02 H CD H 01 H ## H ## H
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