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PRO42R1 Installation Guide, Document 800-26500
5
Communication Wiring
The PRO42R1 communicates to a Honeywell Security intelligent controller
(EP2500 for example) via a half-duplex multi-drop 2-wire RS-485 interface. The
total cable length is limited to 4,000 feet (1,219 meters). Shielded cable of 24 AWG
with characteristic impedance of 120 ohm is specified for the 2- wire RS-485 inter
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face. The device on each end of the communication line should have the termina
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tor installed (install jumper J1 of the PRO42R1)
.