Astra A5040 User Manual - Page 7

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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.

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.

A5022

6 NMEA OUT +

4 NMEA IN+

3 NMEA IN-

Fig 2

1 +8-30V

POWER

SOURCE

7 GND

5 GND

3 NMEA IN -

4 NMEA IN +

6 NMEA OUT +

Fig 3

GND

NMEA current

source

External NMEA device

COM PORT D

CONNECTOR