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3.1 01 (0x01) Read Coils
This function code is used to read the current digital output readback value of
the tM module.
Request
00
01
02 ~ 03
Address
Function code
Starting channel
numbers
1 Byte 1 ~ 247
1 Byte 0x01
2 Bytes 0x0000~0x001F for DO readback
value
0x0020~0x003F for DI value
0x0040~0x005F for DIO Latch high
value
04 ~ 05
Output channel
number
0x0060~0x007F for DIO Latch low
value
2 Bytes 0x0001 ~ 0x001F
Response
00
01
02
03
Address
Function code
Byte count
Output channel
readback value
1 Byte
1 Byte
1 Byte
1 Byte
1 ~ 247
0x01
1
Refer to the Supported Modules
section for the details of the value
1 Byte
1 Byte
1 Byte
1 ~ 247
0x81
Refer to the Modbus standard for
more details.
Error Response
00
01
02
Address
Function code
Exception code
tM Series DIO User Manual, Rev: A1.3 7PH-013-A13
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