Originally Posted by
Armando B.
How are the keypads blinking when they stop working? Do they have any blink code? Are they scrolling in any specific manner?
If they do not blink in any way, they may not be getting any power and we would recommend verifying the pin 2 connection is solid among all wire runs.
If the keypads begin to scroll when they are not working, it may indicate some sort of wiring issue with the link. We would recommend ensuring there is continuity among all wire runs, that pins 3 and 4 are not touching anywhere on any run, that the link does not have a grounding issue, and that the link has the proper voltages. The link shouls see between pins 1-2: ~24V; pins 1-3: ~2V; pins 1-4 ~1V.
A good step would be to disconnect the link when the keypads behave like this and start re-connecting in small pieces, stopping when you add a piece that does not work and investigating the wiring to it.