From where2's response, it sounds like the control panel is just a glorified keypad. Are you sure there are two-way comms going on (duplex)? If not, the main unit may only listen to the control panel when it wants to. Kind of like a power window module in a car, the control panel can squawk all day and the main unit might not listen. Pushing a "close window" button after the window is closed, for example.
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