26 Digital Monitoring Products, Inc. | Troubleshooting Guide
XR150/550 DIAGNOSTICS MENU
TEST LX-BUS
The first Diagnostic function displayed is: TEST LX-BUS � This Diagnostics function allows you to test the panel’s ability
to communicate with zone and output expanders as well as access control modules connected to the LX-Bus™�
1
To continue, press any Select key� The keypad displays: LX-BUS� Enter the LX-Bus Number (1-5)� Refer to
the following table to determine the correct bus number�
LX-BUS NUMBERS
LX-BUS BUS NUMBER
LX500 1
LX600 2
LX700 3
LX800 4
LX900 5
2
You’ve just told the panel which LX-Bus you want to test� The keypad now displays ADDRESS� To test
address ‘00’ on the selected LX-Bus™, simply press CMD� To test only a particular device, enter the 2-digit
LX-Bus device address and press CMD� Bus 1 Address 00 is Zone 500�
Note: Enter the address of the device you are testing� Do not enter a specific zone number� Refer to the
example at the end of the following ‘How it Works’ section for moreinformation�
3
During the test, TESTING . . . STOP displays on the keypad� At any time, you can press the Select key
below STOP to end the test� During the test, the panel records the number of responses from the device�
If all polls are received back by the panel correctly, the keypad displays [0/65535 FAIL] (read this as “zero
failures out of 65,535 polling attempts”) when STOP is selected�
Note: At the TESTING . . . STOP display, the longer you wait before you select STOP, the more polling
attempts the panel is able to make� The number used above (65535) is the highest possible number of polling
attempts�
4
Press the Back Arrow key to enter a new device address or press CMD to exit TEST LX-BUS�
If one or more polling attempts fail, the keypad displays [ * * * * */65535 FAIL ] with the * representing the number of failed polling
attempts� A display of 65535/65535 FAIL indicates a problem with the device or its LX-Bus wiring, such as a bad or broken wire, a wire
harness not properly connected, or excessive noise or distance� It can also mean that a zone number was entered that did not match a
device address�
Example: You have a four-zone expander on LX-Bus #1 that is address 00� The first zone on the expander
is Zone 500� When you try to make the panel poll address 01, the panel isn’t looking for address 00� The
result is 65535/65535 FAIL�
ZONE FINDER
The second Diagnostic function is the Zone Finder� This works even if the zone is not programmed�
1
Press CMD to display [ZONE FINDER]� This function allows you to identify individual zones on devices
connected to the LX-Bus of an interface card, the panel, or any zones on the keypad data bus�
2
To use ZONE FINDER, press any Select key� The display changes to [FAULT ZONE]�
3
The next zone on the system that changes from a normal state to an OPEN or SHORT state is displayed as
[ZONE NO: * * *]� This remains in the display until another zone changes state�
4
To continue, press the Back Arrow key�
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