Network Control Module 300 Series Technical Bulletin 60
If you are using an internal modem on Port 5 or Port 6, there are
no LEDs. It might be helpful to turn on the speakers to check for
operation.
• If the RECV and XMIT LEDs respond irregularly, and the
Focus Windows list all the devices on the N2 trunk for the
NCM as being Offline, the polarity of the N2 wire connection
may be reversed. Inspect the N2 wiring to ensure that the same
color wire exits at the TBC terminal as at the originating end of
the N2 trunk. For further information, refer to N2
Communications Bus Technical Bulletin (LIT-636018).
• If the XMIT LED never lights, check the green RECV LED.
• If the RECV LED does not light, the NCM is not connected to
the N2 Bus. Follow Steps 3-5 (below) to troubleshoot the N2,
or refer to the N2 Communications Bus Technical Bulletin
(LIT-636018).
• If the RECV LED does light without the XMIT LED ever
responding, perhaps no messages are being addressed to the
NCM.
• Ensure that the system is configured to poll the NCM by
checking the address via WNCSETUP.
3. Check the EOL switches. If, by accident, more than two EOL
switches are set on a heavily loaded network, normal
communication could be disrupted (erratic or non-functional).
Also, if Switch 7 is not in the same position as Switch 8,
N2 communication is impaired.
4. Attempt to isolate the N2 device nearest the panel. Establishing
communication to that device indicates that the N2 interface is
operating correctly, and the problem lies in the field wiring.
5. Cycle power to the NCM. Check the self-diagnostics LEDs for
indications of a failure: A faulty N2 connection is one reason that
LED 4 lights.
Port Field Check: RS-232 Port
Follow these steps to field check ports:
1. If not communicating via the RS-232 port, check for the proper
cable configuration and connections. Review the cable diagrams
in the NCM Cable Guidelines section of this document.
2. Verify that baud is compatible with the device. Use the
WNCSETUP routine to monitor and change the baud, if
necessary.
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