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Modbus RTU Function 01 - Read Coil Status

The Modbus RTU Function 01 is used to Read Coil Status, or digital output status from a Modbus Slave data acquisition device. See a typical command and response below with usage description.

Command: 01 01 00 09 00 0A CRC1 CRC2
Response: 01 01 02 7C 03 CRC1 CRC2  

Command Usage:

Address01 - One Byte Slave Address
Function01 - One Byte Function Number
Addr00 - HI Starting Coil Address HI Byte
Addr09 - LO Starting Coil Address LO Byte
Data00 - HI Number of Bits
Data0A - LO Number of Bits
ChecksumTwo Byte CRC

Response Message:

Address01 - One Byte Slave Address
Function01 - One Byte Function Number
Byte Qty02 - Number of data bytes in response
Data HI7C - Data Coils (17-10) Status
Data LO03 - Data Coils (19-18) Status
ChecksumTwo Byte CRC


Finally, when specifying Modbus hardware or software, take a moment to review the documentation for each device and ensure that both the hardware and software will support the necessary functions to operate properly. It is a rare event that there will be problems but this review process will eliminate the possibility of surprises later.


Return to Modbus Overview
Modbus Exception/Error Codes

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