User manual

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SECTION 3: CONNECTIONS AND SETUP
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2. Connect the RJ11 cable to the DVR.
a. If an RS485 port is present on the DVR back panel (DMR41DVD, DMR42DVD only):
i. Examine the RJ11 connector. Record the colors of the center pair wires in the RJ11
connector that connect to pin 3 and pin 4 (center pair) of the RS485 port. These pins
provide the RS485-A and RS485-B signals to the camera. Usually these wire colors are
red and green respectively.
1 2 3 4 5 6
RS485 port
Pin 3: RS485-A
Pin 4: RS485-B
ii. Plug the RJ11 connector into the RS485 port.
b. If an EXTERNAL I/O port is present on the DVR back panel (DMR40DVD only):
i. At the DVR, remove the connector from the RJ11 cable and strip some insulation from
the red and green wires.
ii. Solder the RJ11 cable red wire to pin 11 on the 15-pin D-sub connector. See the
connector pin diagram below.
18
915 11 10
Pins
Pin 11: RS485-A
Pin 10: RS485-B
15-pin D-sub connector – solder side
iii. Solder the RJ11 cable green wire to pin 10 on the 15-pin D-sub connector.