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Polarity!

Be sure to attach the positive wire to the pin labeled + and the negative to the pin labeled -.   Reversing polarity may damage products.
When using RS485 for communication, that also has polarity.  Reversing polarity will cause the system not to function.
Wiring power to the data pins will damage the system.  Be careful to observe the wiring diagrams.  Use a Digital Volt Meter (DVM) to verify the correct polarity and voltage of the wires you are working with.
 
Note
Supply voltages over 18 VDC or under 12 VDC, at each device, may damage the
keypad or other devices!