The keypad for the DS7400XI displays serial IF fault.
The panel has been programmed to use a DS7412 or DX4010, and is not communicating with this device.
If panel is no longer using this RS232 module. The unit needs to be removed from programming:
DS7400XI version 4 : address 4019 needs to = 07
DS7400XI version 3 : address 0206 needs to = 07
DS7400XI version 2 : address 0206 needs to = 07
Part numbers DS7447E, DS7447, DS7447I, DS7400XIVER3+, DS7400XIVER4+, DS7400Xi, DS7400XIVER2