keypad communication failure

[m.khairy]

i have a kp04 , when i communicate it with the system the message that appear on keypad is
keypad communication failure
and the system doesn\'t work

i tested the cable , it\'s good
and isolate all i/o
however the problem is still
 

[ident]

This message means the keypad is not communicating with Comfort either because the KA/KB wires are connected or the ID on the keypad is not set correct

If there is only 1 keypad then the ID should be 1
ie the shunts A B C should be connected

The Number of Keypads in Comfigurator should match the number of keypads in he system and each ID should be set unique

[m.khairy]

Thanks for replying
But,
The KA/KP wires are connected
i have only 1 keypad and the ID is 1
The number of keypads in comfigurator is 1

The problem is still

[hendy]

How long is the cable connecting the KP04 to the Comfort panel?
Try connecting them with a short cable e.g. around 1 meter and see if it makes any difference?

Could it be that the KA/KB connection is reversed i.e. KA goes to KB and vice versa?

You have mentioned the keypad ID is 1 so all shunts A, B, C, D have been ensured to be closed or shunted?

And one more thing, when the Communication Failure displayed on the KP04, what Keypad number is displayed? Is it Keypad 1 e.g. \"Communication Failure Keypad 1\" or some other numbers?

[m.khairy]

Communication Failure Keypad 1

[hendy]

Have you tried with a short cable?

[ident]

what else is connected to KA KB? are these other modules working?
Can you connect a UCM to Comfort and communicate?
What are the state of the red and green leds on Comfort PCB

[m.khairy]

The problem was in the firmware update ,
when i updated the firmware the keypad worked correctly

[ident]

I think there may have been a firmware upgrade attempted before which was not successful which caused the system to be inoperative.