How to define an AR Opt. Bus Err on DS7400 Series

[#1]

Issue

The keypad displays AR Opt. Bus Err.

Solution

Probable Cause:

The panel can no longer communicate with the Ardis module.

Possible Solution:

Check the wiring between the DS7400 and the Ardis module.

Part numbers DS7400X, DS7400, DS7400Xi, DS7400XIVER2, DS7400XIVER3+, DS7400XIVER4