Diagnosis behavior

Each diagnosis message signals if this error is coming or going , so it is possible to create a list in the master of actual pending diagnosis.

Diagnosis messages will be transferred again after a bus failure detection and reconnection.

Diagnosis messages can be read out with function code 3,4,23. Function codes 3 and 4 can always read out diagnosis messages, function code 23 can only read out after successful parameterization of the device. See also table MODBUS Communication Interface Module.