0X01) Read Coil Registers - ICP DAS USA tM-TH8 User Manual

tM-TH8

3.1 01 (0x01) Read Coil Registers

This function code is used to read the digital output channel status
of a module.
Request
00 Address
01 Function code
02 ~ 03 Starting channel
04 ~ 05 Number of digital
output channels
Response
00 Address
01 Function code
02 Byte count
03 Data of digital
output channels
Error Response
00 Address
01 Function code
02 Exception code
tM-TH8 User Manual, Rev: A1.1 7MH-018-A11
1 Byte 1 to 247
1 Byte 0x01
2 Bytes 256 to 272
2 Bytes N, 1 to 16
1 Byte 1 to 247
1 Byte 0x01
1 Byte 1
1 Byte A bit corresponds to a channel.
When the bit is 1 it denotes that
the channel is ON. If the bit is 0 it
denotes that the channel is OFF.
1 Byte 1 to 247
1 Byte 0x81
1 Byte 02: starting channel out of range
03: out of range, incorrect number
of bytes received
109