Communications
C.39 Error handling
HydroRanger 200 HMI
344 Operating Instructions, 06/2018, A5E36281317-AC
When polled by a Modbus Master, a slave device will do one of the following:
1. Not reply. This means that something went wrong with the transmission of the message.
2. Echo back the command with the correct response (see the Modbus specification
(http://www.modbus.org/specs.php
) for more details). This is the normal response.
3. Return an Exception Code. This reflects an error in the message.
The device uses the following exception codes:
01 Illegal Function The function code received in the query is
not an allowable action for the slave.
02 Illegal Data Address The data address received in the query is
not an allowable address for the slave.
03 Illegal Data Value A value contained in the query data field is
not an allowable value for the slave.
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