D.3
Date Code 20020903 SEL-587Z Instruction Manual
Modbus RTU Communications Protocol
Modbus Overview
Cyclical
Redundancy
Check (CRC)
The SEL-587Z calculates a two-byte CRC value using the device address,
function code, and data fields. It appends this value to the end of every
Modbus response. When the master device receives the response, it
recalculates the CRC. If the calculated CRC matches the CRC sent by the
SEL-587Z, the master device uses the data received. If there is not a match,
the check fails and the message is ignored. The devices use a similar process
when the master sends queries.
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