Thank you again to those of you that saw and commented on my post requesting information on how to create a clone of a FasTrack switch remote controller.
Now I have a question on the other end. For background I'm creating a test set that allows me to debug a control panel, switches and the wiring between them independently . The controller can be used to diagnose the switch end, now i am looking to diagnose the controller end.
To do so I need build a circuit that uses the four wires appropriately. Yellow presents the problem in that it uses +4.5v and -4.5v to indicate thru or out. The question is how does one create a circuit that delivers -4.5v (from either 18v track voltage or a dedicated ~5v power supply) While likely a basic question for many of you I just don't know how.