Maybe its specific terminology, but what do you mean by "output" for the fobs? The system was working before with the same remote keypads to arm and disarm until I reset the previous user codes on the control panel. So the underlying infrastructure still exists and is connected, but like said above, whilst the receivers are now programmed with the remote keyfobs again, they don't seem to be accepted by the control panel as such.
Also, if it helps, I have programmed both keyfobs under their respective transmitter numbers for Zone 1 on each of the two receivers and I can test their configuration in the communication menu/option too. When I press the arm button on the remote, then I can see the respective transmitter number, zone 1 and the red alarm led light up on both receivers.