Interfaces of the ACU
4-2
Chapter 4: Interfaces
98-166784-A
4.1.3
ADU connector
The coax cable from the ACU to the PIU and ADU supplies DC power and handles all
communication between ACU and ADU.
4.1.4
Rx In and Tx Out connectors
4.1.5
NET-H (NMEA 0183
1
connector, for future use)
1. Connect the pins according to the table above.
Outline
(on the ACU)
Conductor
Pin function
Inner
DC to ADU
reference clock to ADU
ACU to ADU internal
communication
Outer
GND (Shield)
Table 4-2: N connector, outline and pin assignment
Important
Do not use TNC connectors on the ACU, ADU antenna cable or on pigtails.
TNC connectors cannot carry the DC current for operating the ADU.
Outline (on the ACU) Pin number
Pin function
1
Inner conductor
2
Outer conductor: GND (Shield)
Table 4-3: F connector, Rx and Tx, outline and pin assignment
Outline (on the ACU)
Pin
Pin function
Wire color
1
Not connected
–
2
NET-H (NMEA 2000)
White
3
NET-L (NMEA 2000)
Blue
4
NET-S (NMEA 2000)
Red
5
NET-C (NMEA 2000)
Black
6
Not connected
–
7
RS-232 RX (NMEA 0183)
–
8
RS-232 GND
RS-422 shield, connect only
one end.
9
RS-422 Line B (+) NMEA 0183
10 RS-422 Line A (-) NMEA 0183
11 Not connected
–
Table 4-4: NMEA 0183/2000 connector, outline and pin assignment
1 11
