0X01) Read Coils - ICP DAS USA PIR-130-AC User Manual

3.2 01 (0x01) Read Coils

This function code is used to read the values at addresses 0xxxx and 1xxxx.
Request
Byte Description
00 Address
01 Function Code
02 - 03 Starting Address
04 - 05 Number of
Addresses
Requested
*N = Number of addresses requested
Response
Byte Description
00 Address
01 Function Code
02 Byte Count
03 Value from the
Requested Address
*N = (Number of addresses requested / 8)
Error Response
Byte Description
00 Address
01 Function Code
02 Exception Code
PIR-130-AC/DC User Manual Ver. 1.4.0, 2020/07/28
Length
Value
(in Bytes)
1 1 to 247
1 0x01
2 Refer to the Modbus Address Mapping
Table for details.
2 0x0001 to 0x0001 + *N
Length
Value
(in Bytes)
1 1 to 247
1 0x01
1 *N
*N
Length
Value
(in Bytes)
1 1 to 247
1 0x81
1 Refer to the Modbus standard for more
details.
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