Garmin COMPACT REACTOR 40 Installation Instructions Manual page 18

Connecting the Autopilot Components to an Existing NMEA 2000 Network
A dedicated helm control is not included in all autopilot packages. If you install the autopilot without a dedicated
helm control, the autopilot CCU must be connected to the same NMEA 2000 network as a compatible Garmin
chartplotter to configure and control the autopilot system.
You should apply dielectric grease to the pin holes on the cable connectors to prevent corrosion, especially if
you are using the autopilot system in saltwater.
1 Determine where to connect the CCU
backbone .
2 In the location where you plan to connect the CCU, disconnect one side of a NMEA 2000 T-connector
from the network.
3 If necessary, connect a NMEA 2000 backbone extension cable (not included) to the side of the disconnected
T-connector to extend the NMEA 2000 network backbone.
4 Add an included T‑connector for the CCU to the NMEA 2000 backbone by connecting it to the side of the
disconnected T‑connector or backbone extension cable.
5 Route the included drop cable
If the included drop cable is not long enough, you can use a drop cable up to 6 m (20 ft.) long (not included).
6 Connect the drop cable to the CCU and the T-connector.
7 If needed, repeat steps 2 through 6 for the helm control (optional) or a compatible Garmin chartplotter.
18
NOTICE
and the helm control (optional)
to the CCU and to the bottom of the T-connector added in step 4.
to your existing NMEA 2000