General Notes
1. Do not connect/disconnect devices when the panel is live, may cause alarms and trouble condition, use
caution when doing so during troubleshooting process.
2. Mixing old dipswitch only devices and new Serial devices should be avoided, because it can cause
problems, especially on the 100+ zone panels. (See Note 3 Below)
a. It can cause very slow zone response, and possibly slow the polling loop to where a random zone
trouble occurs.
b. 4101sn relay response may be inconsistent.
c. All Serial/Dip devices must be Serial for best results in this case.
3. Twisted or Shielded Wire with one end of the shield to ground is a must for polling loop runs. See the
Wire Limitations on
Page 7.
4. Serial number mode is A MUST if the panel and RPM are both able to do this mode (except 4208U and
4209U).
a. See direct wire numbers 134 and 135 “Mixing Serial and Dipswitch V/Plex Devices”
5. The key to any troubleshooting process is isolation. Isolate individual devices until you have a basic sub-
system that works properly. Then add more of the total system piece-by piece, until everything is working.
6. A zone that has a trouble condition will display as “CHECK xx” where xx is the zone number.
a. After pressing “*” to scroll through these, they may display “FAULT xx.” This can make it
difficult to isolate which zones have a trouble condition versus a simple fault.
b. It may help to strap the zones with a resistor to eliminate a “fault” condition, or disarm to show
checks, and do not press the * after that. In addition, some panels have the option to display
“TRBL” instead of “CHECK”. This is only a display difference. “TRBL” and “CHECK” mean
the same thing.
7. V-plex smokes and motions can cause other devices to appear to have problems. The symptoms may not
directly point to the real cause of the problems. Always look at the whole system configuration. For
specific notes on V-plex smoke detectors and motion sensors, see notes under the appropriate sections.
8. To assist trouble shooting, be sure that Polling Loop Short detection (zone 97 or 997) and Earth Ground
fault detection (zone 72 or 972) are enabled, Earth Ground fault detection is only a feature of a commercial
fire panel. This will help find the real problem.
a. If a ground fault exists, reference the ground fault-troubleshooting document for troubleshooting
steps.
9. As a last resort, bring the devices back to the control panel to see if they work alone at the panel. Other
steps are:
a. Default the panel and start hand programming in each zone and check operation.
b. Replace the RPM and/or control panel
10. Abbreviations: RPM = remote point module, SIM = Serial Interface Module, V-plex/multiplex/mux/mpx =
polling loop
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