Garmin GPSMAP 820 Installation Instructions - Page 3
Connecting the Device to a Garmin Marine Radar - chartplotter
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• When connecting NMEA 0183 devices with two transmitting and two receiving wires, it is not necessary for the NMEA 2000® bus and the NMEA 0183 device 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 2000 bus and the NMEA 0183 device must be connected to a common ground. NMEA 0183 Connection Diagram + - Item Description 12 Vdc power source À Wiring harness Á NMEA 0183-compliant device  Item Garmin Wire Function Garmin Wire Color NMEA 0183 Device Wire Function Power Ê Ground Ë Tx Ì Rx Í Red Black Blue Brown Power Data ground Rx/A (+) Tx/A (+) Lamp or Horn Connections The device can be used with a lamp, a horn, or both, to sound or flash an alert when the chartplotter displays a message. This is optional, and the alarm wire is not necessary for the device to function normally. When connecting the device to a lamp or horn, observe these considerations. • The alarm circuit switches to a low-voltage state when the alarm sounds. • The maximum current is 100 mA, and a relay is needed to limit the current from the chartplotter to 100 mA. • To manually toggle visual and audible alerts, you can install single-pole, single-throw switches. Item Description Power source À Power cable Á Horn  Lamp à Relay (100 mA coil current) Ä Toggle switches to enable and disable lamp or horn alerts Å Item Wire Color Wire Function Red Ê Black Ë Yellow Ì Power Ground Alarm Connecting the Device to a Transducer Devices that can receive depth information from a Garmin transducer have a port labeled SONAR. Go to www.garmin.com or contact your local Garmin dealer to determine the appropriate type of transducer for your needs. 1 Follow the instructions provided with your transducer to install it on your boat correctly. 2 Route the transducer cable to the back of your device, away from sources of electrical interference. 3 Connect the transducer cable to the SONAR port on your device. Connecting the Device to an External Garmin Sounder Module Devices that can receive information from an external Garmin sounder module have a port labeled ETHERNET. Go to www.garmin.com or contact your local Garmin dealer to determine the appropriate type of sonar device for your needs. 1 Follow the instructions provided with your sounder module to install it on your boat correctly. 2 Route the Garmin Marine Network cable from the sounder module to the back of your device, away from sources of electrical interference. 3 Connect the Garmin Marine Network cable to the ETHERNET port on your device. Connecting the Device to a Garmin Marine Radar Devices that can receive information from a Garmin radar have a port labeled ETHERNET. Go to www.garmin.com or contact your local Garmin dealer to determine the appropriate type of radar for your needs. 1 Follow the instructions provided with your Garmin radar to install it on your boat correctly. 2 Route the Garmin Marine Network cable from the radar to the back of your device, away from sources of electrical interference. 3 Connect the Garmin Marine Network cable to the ETHERNET port on your device. Radar, Sonar, and Map Sharing Considerations Devices that can share supplemental map information and view data from a single radar or sonar module at the same time have a port labeled ETHERNET. Go to www.garmin.com or contact your local Garmin dealer to determine the appropriate type of devices for your needs. When connecting this device to compatible ETHERNET devices, you should observe these considerations. • This device is compatible only with other Garmin ETHERNET devices, and does not share data with Garmin Marine Network devices such as a GPSMAP 8000 series device. • This device is not compatible with legacy Garmin sounder modules such as the GSD™ 26. • If your device receives sonar data from a transducer connected to the SONAR port, it does not share the sonar data with other ETHERNET devices. • A Garmin Marine Network cable must be used for all ETHERNET connections. ◦ Third-party CAT5 cable and RJ45 connectors must not be used for ETHERNET connections. ◦ Additional Garmin Marine Network cables and connectors are available from your Garmin dealer. • If this device has a single ETHERNET port, you may need to use a Garmin network switch, such as a GMS™ 10 to connect a radar or sounder module to more than one ETHERNET device. • If this device has both a RADAR port and an ETHERNET port, you can connect an ETHERNET device to either port. • Some sounder modules, such as the GCV™ 10 have more than one ETHERNET port, and can connect to multiple ETHERNET devices without an additional network switch. 3