Title: Hardware Installation Guide.pdf
Note:If either of these inputs is not used, a shorting wire should be installed.52.1.2Upstream Communication to the Intelligent System ControllerThe Output Control Module uses Port 1 to communicate to the Intelligent System Controller. Port 1 is an RS-485 interface that requires the following type of RS-485 cable: 24 AWG (minimum) twisted pair (with shields). Either 2-wire or 4-wire RS-485 cable configuration can be used for series 1. Only 2-wire RS-485 cable configuration can be used for series 2. The main run RS-485 cable should be no longer than 4000 feet (1219 m), 100 ohms maximum (Belden 9842, West Penn, or equivalent). The drop cables (to readers and other devices) should be kept as short as possible, no longer than 10 feet (Belden 9502 or equivalent).294 — revision 6Hardware Installation GuideThe RS-485 communication is asynchronous, half-duplex, using 1 start bit, 8 data bits, 1 stop bit.