Furuno VR-7000 Installation Manual page 34

2. WIRING
Notice for the connection with the remote alarm panel
When connecting the DCU to the remote alarm panel (RAP), do as follows to prevent
the malfunction due to the difference of ground voltages between the DCU and RAP.
1. Connect the ground terminal of the DCU and remote alarm panel to the ship's
ground.
2. Connect the serial cable to either J309 port of the DCU or J101 port of the remote
alarm panel.
3. For the port not connected at step 2, insert the signal core to # 5 pin (GND) only,
then connect the connector.
4. Disconnect the connector connected at step 3, then insert other signal cores and
reconnect the connector.
Crimp-on lug for the drain wire
Two crimp-on lugs are preattached in the DCU (see the figure below). Attach the
crimp-on lug to the drain wire of the cable for the AMS (serial) and remote alarm panel,
then connect the lug to its original location.
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