Garmin GHP 20 Marine Autopilot System for Steer-by-Wire Installation Instructi - Page 14

Appendix NMEA 0183 Connection Diagrams The following three connection diagrams are examples of different situations you may encounter when connecting your NMEA 0183 device to the GHC 10. Example One of Three: Two-way NMEA 0183 Communication ➋ ➌ + - ➊ ➊ > > ➌ ➋ > ➍ > ➍ > > ➎ > > ➏ ➊ GHC 10 ➋ NMEA 2000 network (provides power to the GHC 10) ➌ 12 VDC power source ➍ NMEA 0183-compatible device Wire GHC 10 Wire Color - Function ➊ N/A ➋ N/A ➌ Blue - Tx/A (+) ➍ White - Tx/B (-) ➎ Brown - Rx/A (+) ➏ Green - Rx/B (-) NMEA 0183-Compatible Device Wire Function Power NMEA 0183 ground Rx/A (+) Rx/B (-) Tx/A (+) Tx/B (-) NOTE: When connecting NMEA 0183 devices 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. Example Two of Three: Only One Receiving Wire If your NMEA 0183-compatible device has only one receiving wire (Rx), connect it to the blue wire (Tx/A) from the GHC 10, and leave the white wire (Tx/B) from the GHC 10 unconnected. ➋ ➌ + - ➊ ➊ ➋ > ➌ ➍ > ➍ ➎ > > ➏ Wire GHC 10 Wire Color - Function ➊ N/A ➋ N/A ➌ Blue - Tx/A (+) ➍ White - unconnected ➎ Brown - Rx/A (+) ➏ Green - Rx/B (-) 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. Example Three of Three: Only One Transmitting Wire If your NMEA 0183-compatible device has only one transmitting wire (Tx), connect it to the brown wire (Rx/A) from the GHC 10, and connect the green wire (Rx/B) from the GHC 10 to NMEA ground. ➋ ➌ + - ➊ ➊ ➋ > ➌ > ➍ > ➍ > > > ➎ ➊ GHC 10 ➋ NMEA 2000 network (provides power to the GHC 10) ➌ 12 VDC power source ➍ NMEA 0183-compatible device Wire GHC 10 Wire Color - Function ➊ N/A ➋ Green - Rx/B - connect to NMEA 0183 ground ➌ Blue - Tx/A (+) ➍ White - Tx/B (-) ➎ Brown - Rx/A (+) 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. > > ➊ GHC 10 ➋ NMEA 2000 network (provides power to the GHC 10) ➌ 12 VDC power source ➍ NMEA 0183-compatible device 14 GHP 20 Installation Instructions