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 has NOTHING to do with

the LX-Bus™.

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 earth ground 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.

TECH NOTE: Multiple UNSUPERVISED devices may share the same address, as long as:

1) ALL devices using the address are set for UNSUPERVISED operation,

2) None of the devices using the address are being used for zone expansion

3) There is sufficient 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 TEN 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.

-NOTES-

_____________