Autonics TM Series - 1 Modbus RTU Protocol; Read Coil Status(Func 01-01 H)

1 Modbus RTU Protocol
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1 Modbus RTU Protocol
1.1 Read coil status(Func 01–01H)
Read output(OX reference, Coil) ON/OFF status in the slave device.
(1) Query (Master)
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)
Slave address Function Byte count Data Data Data
Error check(CRC16)
Low
High
1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte 1Byte
If read the 10 output status(ON: 1, OFF: 0) within coil 000001(0000 H) to 000010(0009 H) on
Slave(Address 17) from Master.
 Query (Master)
Slave address Function
Starting address
No. of points
Error check(CRC16)
High
Low
High
Low
Low
High
11 H 01 H 00 H 00 H 00 H 0A H ## H ## H
If the values range from coil 000008(0007 H) to 000001(0000 H) on the Slave are “ON-ON-OFF-
OFF-ON-ON-OFF-ON”, and the values from 000010(0009 H) to 000009(0008 H) are
respectively “OFF-ON”.
 Response (Slave)
Slave address Function Byte count
Data
(000008 to 000001)
Data
(000010 to 000009)
Error check(CRC16)
Low
High
11 H 01 H 02 H CD H 01 H ## H ## H
CRC16
CRC16