Okuma Alarm-D 4219 Communication procedure ENQ
ENQ is received more than permissible times in communication procedures.
1->ENQ is interfered for consecutive RC4 + 1 times in phase 2. (transmitting station)
2->ENQ to urge response has lasted for consecutive RC7 times in phase 3. (receiving station) (This system does not involve this alarm.)
3->ENQ to urge response has lasted for consecutive RC7 times in phase 4. (receiving station) (This system does not involve this alarm.)
Probable Faulty Locations
1)Defective RS232C interface
2)Defective hardware or software of the host computer
3)Mismatch between the actual communication line specification (baud rate, code configuration, etc.) and the communication set by the communication parameters.
Measures to Take
1)Check the hardware and software of the host computer.
2)Change the FRP board or RPP board channel to other channel by setting proper data at communication parameter.
Change the connection of the connector to the proper position,accordingly.
3)Check the following communication specifications between the actual communication line specification and the communication parameters:
RS232C interface channel being used
Number of stop bits
Use of WACK/TTD control
Effective/ineffective transparent mode