Astra A5022 - Connecting the Compass to Your Application; Compass to a NMEA-0183 Instrument; Compass to a PC Serial Port

6
A5022
COM PORT D
CONNECTOR
2
3
5
4 NMEA IN +
3 NMEA IN -
5 GND
6 NMEA OUT +
7 GND
+
POWER
SOURCE
-1 +8-30V
2 Connecting the compass to your application
2.1 Compass to a NMEA-0183 instrument
The hardware on which the NMEA-0183 standard is based on is a balanced serial protocol called
RS422. This means that two wires are need for send and two for receive.
Fig 2
Note that the GND wire is used for the current return path. This might be shared with the
NMEA- wire in some installations.
2.2 Compass to a PC serial port
In many cases the wires can be joined directly as shown in Fig 2. Alternatively use the Astra
Yacht A3036 serial interface unit.
Fig 3
External NMEA device
6 NMEA OUT +
4 NMEA IN+
3 NMEA IN-
5 GND
NMEA current
source
+
-