It's possible for the RP-120 controller to lose its settings especially when it's being connected/disconnected every day. If the controller no longer will control any camera it's connected to, do the following:

1) On the controller, press the "49" System button. The LCD screen should read "Initialize All".

2) Press in the F2 Knob. The screen should now read "Initialize All Ok? No".

3) Turn the F2 Knob so it reads "Initialize All Ok? Yes".

4) Press in the F2 Knob to confirm "Yes" and start initialization. The screen will read "Initializing...".

5) Once it is completed, the screen will now read "Please reboot RP 120".

6) Cycle power on the controller.

7) When it has booted back up, press the "36" CTRL Type button. The screen will read "Cam 1, No Assign".

8) Turn the F2 Knob so it reads "Cam 1, Serial"

9) Press in the F2 Knob to confirm "Serial".

10) Cycle power on the controller one more time. When it boots back up, everything should be working.