FUNCTION CODES EXCEPTION CODE HANDLING
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8.10. Exception Code Handling
Handling of exception code is supported according to MODBUS specification. The following
response telegrams will be sent if a query could not be served:
Exception code 1 (Illegal function)
A Function Code was received that is not supported.
Exception code 2 (Illegal data address)
A register address is out of the valid range.
Exception code 3 (Illegal data value)
The length of the telegram is not valid (start address + register counter >
start address range + 1).
Exception code 8 (Memory parity error)
The CRC of the received telegrams is not correct.
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