Title: Hardware Installation Guide.pdf
If either of these inputs is not used, a shorting wire should be installed.Unsupervised Alarm Input WiringCABINET TAMPERGNDIN 2POWER FAULTGNDIN 19.1.2Upstream Host CommunicationThe ISC uses Port 1 to communicate to the host system. Port 1 can be wired as an RS-232 interface for direct one-to-one (or modem) communication, or as an RS-485 interface for multi-drop or extended distance communication.revision 6 — 63LNL-500 Intelligent System ControllerDirect-connect RS-232 cables should be no longer than 50 feet. Leased lines or fiber optics can also be used.