Firstech, LLC. CM4200 - Manual (Page 31)

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CONNECTOR 7
(Pre-wired Remote Paging Sensor or R.P.S.)
Pin 1 Black-R.P.S. sensor (-) negative ground input.
Pin 2 White-R.P.S. sensor (-) negative paging input.
Pin 3 Red-R.P.S. sensor 12-volt (+) positive input.
Pin 4 Yellow- R.P.S. sensor 9-volt (+) positive L.E.D. output
CONNECTOR 8
(Pre-wired Antenna Cable)
Pin 1 Yellow-RX input. This wire receives signal from remote.
Pin 2 White-TX output. This wire transmits signal to remote.
Pin 3 Red-12-volt constant (+) positive input.
Pin 4 Black- (-) negative ground input.