Title: Hardware Installation Guide.pdf
2 3 5DB9-pin Connector (Jumper Wires 4,6,8 Together)TO CONTROL ROCKET PORT HO-2062 COMBO BOARD (PORTS 1 AND/OR 2)Wire Configuration – Switch #5 must be off for all panels in this configuration.9.1.3Downstream Device CommunicationThe ISC can be configured to communicate downstream with up to 8 input/output devices, using Port 2 and Port 3. Each of these ports can be wired only as an RS-485 interface, for multi-drop communication on a single bus of up to 4000 feet.For Ports 2-3, the following type of RS-485 cable is required: 24 AWG (minimum) twisted pair (with shields.) Either 2-wire or 4-wire RS-485 cable configuration can be used. The main run RS-485 cable should be no longer than 4000 feet (1219 m), 100 ohms maximum (Belden 9842 4-wire or 9841 2-wire, plenum cabling Belden 88102, West Penn, or equivalent). The drop cables (to readers and other devices) should be kept as short as possible, no longer than 10 feet.Each RS-485 line should contain only 2 terminators, one at each end.