12 Digital Monitoring Products, Inc. | Troubleshooting Guide
4-WIRE BUS TROUBLE
When the keypad displays 4-WIRE BUS TRBL it means that the panel has a problem communicating with the keypad
bus devices� 4-WIRE BUS TRBL is not an indication of LX-Bus issues� More specifically, when the panel polls the keypad
bus devices, they aren’t able to respond�
4-WIRE BUS TRBL only displays for the following reasons:
1
All keypad bus devices set to Unsupervised:
Make sure at least one keypad bus device is set as Supervised�
2
Multiple keypad bus devices set to same Supervised address:
Make sure that all keypad bus devices are addressed correctly (all devices sharing an address*
must be set as UNSUPERVISED)�
3
Low voltage or no voltage on the panel’s Yellow (receive) wire (terminal 8):
Check data voltage (DC) across terminals 8 & 10 at the panel and at the device� If the voltage is low
or open, remove the wires from terminals 7 - 10 and check voltage again�
If still low or open, reset the panel using the J16 jumper and check the voltage again� If voltage is
still low or open, remove all wiring (except AC power) and check again� This last step is taken to
make sure that transient voltage isn’t being fed into the panel from the field wiring�
Note: Multiple UNSUPERVISED devices may share the same address, as long as:
All devices using the same address are set for UNSUPERVISED operation,
None of the devices using the same address are being used for zone expansion, and
There is sucient auxiliary power available to operate the devices� Auxiliary power may be
provided by the panel or an auxiliary power supply or both�
TRANSMIT FAIL
When the keypad displays TRANSMIT FAIL it means that the panel made 10 attempts to communicate with the receiver,
but was unsuccessful�
After the ten attempts have failed, the panel tries once every hour to send a TRANSMIT FAIL message to the receiver�
The keypad only displays TRANSMIT FAIL when a user disarms the system or when an unsuccessful SYSTEM TEST has
been initiated from the User Menu�
WHAT TO DO
1
Arm the system� Let the Exit Delay timer count all the way down, and then disarm the system�
If communication to the receiver has been restored (i�e�- the panel successfully communicated the
TRANSMIT FAIL or any other signal), this should clear the display�
2
Try to send a test-signal�
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