IBM System/7 Functional Characteristics - All about the IBM 1130 ...

Begin Diagnostic: This code (hexadecimal 08) can be used by the program as part of thearea station diagnostic procedure. The addressed area station enters diagnostic mode whenit receives this command. In diagnostic mode, the area station responds only to commandsaddressed to it. The only valid response is begin diagnostic acknowledge.End Diagnostic: This code (hexadecimal OC) is used by the program to end the area stationdiagnostic procedure. The area station is removed from diagnostic mode and returns tonormal operation when this command is received. The only valid response is end diagnosticacknowledge.Control ResponsesAll control responses are generated by the area station and sent back to the 2790 Control.Bypass Acknowledge: This code (hexadecimal 6B) is a response to the bypass commandand indicates that the area station has executed the command.Restore Acknowledge: This code (hexadecimal 63) is a response to the restore commandif the area station is already on line (not bypassed) when the command is received. Thisresponse is also inserted prior to the data byte if the area station is off line (bypassed)when the restore command is received.Begin Diagnostic Acknowledge: This code (hexadecimal 68) is a response to the begindiagnostic command, and indicates that the area station has entered diagnostic mode.End Diagnostic Acknowledge: This code (hexadecimal 4C) is a response to the enddiagnostic command, and indicates that the area station has returned to the normal modeof operation.14-22 GA34-0003