Garmin GHP Compact Reactor Hydraulic Autopilot with GHC 20 Pack Installation I - Page 10

• The internal NMEA 0183 ports and communication protocols are configured on the connected Garmin device. See the NMEA 0183 section of the chartplotter owner's manual for more information. • The ground wires on the NMEA 0183 data cable and your NMEA 0183 device must both be connected to ground. • When connecting NMEA 0183 devices with two transmitting and two receiving wires, it is not necessary for the NMEA 0183 devices to connect to a common ground. • When connecting a NMEA 0183 device with only one transmitting (Tx) wire or with only one receiving (Rx) wire, the NMEA 0183 devices must be connected to a common ground. • For two-way communication with a NMEA 0183 device, the internal ports on the NMEA 0183 data cable are not linked. For example, if the input of the NMEA 0183 device is connected to the internal output port 1 on the data cable, you can connect the output port of your NMEA 0183 device to any of the internal input ports (port 1, port 2, port 3, or port 4) on the wiring harness. • There are four internal NMEA 0183 input ports (Rx ports), and two internal NMEA 0183 output (Tx ports) on the included NMEA 0183 data cable. You can connect one NMEA 0183 device per internal Rx port to input data to your Garmin device, and you can connect up to three NMEA 0183 devices in parallel to each internal Tx port to receive data output by your Garmin device. Two-Way NMEA 0183 Communication NMEA 2000network (provides power to the helm control) À 12 Vdc power source Á Helm control  NMEA 0183-compatible device à Wire Helm Control Wire Color - Function N/A Ê N/A Ë Blue - Tx/A (+) Ì White - unconnected Í Brown - Rx/A (+) Î Green - Rx/B (-) Ï NMEA 0183-Compatible Device Wire Function Power NMEA 0183 ground Rx N/A Tx/A (+) Tx/B (-) NOTE: When connecting a NMEA 0183 device with only one receiving (Rx) line, the NMEA 2000 bus and the NMEA 0183 device must be connected to a common ground. Only One Transmitting Wire If your NMEA 0183-compatible device has only one transmitting wire (Tx), it must be connected to the brown wire (Rx/A) from the helm control, and the green wire (Rx/B) from the helm control must be connected to NMEA 0183 ground. NMEA 2000 network (provides power to the helm control) À 12 Vdc power source Á Helm control  NMEA 0183-compatible device à Wire Helm Control Wire Color - Function N/A Ê N/A Ë Blue - Tx/A (+) Ì White - Tx/B (-) Í Brown - Rx/A (+) Î Green - Rx/B (-) Ï NMEA 0183-Compatible Device Wire Function Power NMEA 0183 ground Rx/A (+) Rx/B (-) Tx/A (+) Tx/B (-) NOTE: When connecting a NMEA 0183 device with two transmitting and two receiving lines, it is not necessary for the NMEA 2000 bus and the NMEA 0183 device to connect to a common ground. Only One Receiving Wire If your NMEA 0183-compatible device has only one receiving wire (Rx), it must be connected to the blue wire (Tx/A) from the helm control, and the white wire (Tx/B) from the helm control must remain unconnected. NMEA 2000 network (provides power to the helm control) À 12 Vdc power source Á Helm control  NMEA 0183-compatible device à Wire Helm Control Wire Color - Function N/A Ê Green - Rx/B (-) (connect to Ë NMEA 0183 ground) Blue - Tx/A (+) Ì White - Tx/B (-) Í Brown - Rx/A (+) Î NMEA 0183-Compatible Device Wire Function Power NMEA 0183 ground Rx/A (+) Rx/B (-) Tx/A (+) NOTE: When connecting a NMEA 0183 device with only one transmitting (Tx) line, the NMEA 2000 bus and the NMEA 0183 device must be connected to a common ground. 10