AuCom Modbus RTU Card Instructions Manual page 15

4.9 Modbus Error Codes
Code Description
1 Illegal function code
2 Illegal data address
3 Illegal data value
4 Slave device error
6 Slave device busy
Modbus RTU Card (710-16499-00B)
Example
The adapter or starter does not support the
requested function
The adapter or starter does not support the
specified register address
The adapter or starter does not support one of
the received data values
An error occurred while trying to perform the
requested function
The adapter is busy (for example writing
parameters to the starter)
INSTRUCTIONS
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