In the event of a failure in client/server communication using OSI TP, the XATMI interface function that requested the service returns an error. For details about the actual return values, see the notes for the individual functions of the XATMI interface in the applicable OpenTP1 Programming Reference manual.

For details about handling communication protocol failures, see the description of error handling procedures in the manual OpenTP1 Protocol TP1/NET/OSI-TP-Extended.