TruVision DVR 60 User Manual - Interlogix

1BChapter 2: InstallationCameraSwitch settingLegend Protocol switches: 1Address switches:Select thecamera IDDIP switchaddress asrequired.RS-485 data connector:Wiring the keypadThe keypad uses RS-485 simplex wiring. The signal is transferred by a singletwisted pair line. A shielded STP CAT5 network cable is recommended. Groundone end of the cable, either the first or last device on the RS-485 line.The maximum number of devices that can be installed in one bus is 255, with amaximum cable length of 1200 m. The cable length can be expanded using asignal distributor.Both the first and the last device in series should be terminated with 120 Ohmresistance to minimize line reflections. See Figure 3 on page 13.12 TruVision DVR 60 User Manual