A5023/24
8 of 19
A
5
0
2
2
C
O
M
P
O
R
T
D
C
O
N
N
E
C
T
O
R
2
3
5
4
N
M
E
A
IN
+
3
N
M
E
A
IN
-
5
G
N
D
6
N
M
E
A
O
U
T
+
7
G
N
D
+
P
O
W
E
R
S
O
U
R
C
E
-
1
+
8
-3
0
V
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 Autonnic A3036 serial interface unit.
Fig 3
External NMEA device
6 NMEA OUT +
4 NMEA IN+
3 NMEA IN-
5 GND
NMEA current
source
+
-
