Title: Hardware Installation Guide.pdf
Unsupervised Alarm Input Wiring (Power Fail and External Tamper contacts)49.3Upstream Controller CommunicationThe ICM uses Port 1 to communicate to the Intelligent System Controller.Port 1 is a 2-wire RS-485 interface, that requires the following type of RS-485 cable: 24 AWG (minimum) twisted pair (with shields). The main run RS-485 cable should be no longer than 4000 feet [1219 m], 100 ohms maximum (Belden 9841, West Penn, or equivalent). The drop cables (to downstream devices) should be kept as short as possible, no longer than 10 feet [3.048 m].The RS-485 communication is asynchronous, half-duplex, using 1 start bit, 8 data bits, 1 stop bit.Note:RS-485 communication is supported for upstream communication only.282 — revision 6Hardware Installation GuideICM upstream wiringTo enable RS-485 termination, install jumper on pin header J22 (on the last unit on the communication line).Notes: