Simrad AP21 and AP22 Autopilots
120 20220596G
NMEA signal monitor
Close to the NMEA terminals in the junction unit you will find a
green LED marked “RX”. A flickering LED indicates that an
NMEA signal is received. It does not, however, qualify the
contents of the message.
Note ! Do not mix this “RX” LED with the LED marked “TX”. The
“TX” LED will always be lit/flickering when the autopilot is on.
NMEA (hardware) test
Access the NMEA Test from the INSTALLATION Menu (see
page 86).
Loopback
INSTALLATION
NMEA1 FAIL
NMEA2 OK
On the Main PCB in the junction unit disconnect the cables and
connect TX1+ to RX1+ and TX1- to RX1-. Similar on the Power
PCB connect the NMEA ports the same way; TX2+ to RX2+ and
TX2– to RX2– (not available on J3000X).
Select the NMEA test menu and verify that the hardware is OK.
If not, replace the corresponding PCB(s) to rectify.
Note ! With J3XX software version V1R5 the display readout will not
automatically reset to FAILED when you remove the TX/RX
straps. You will have to turn the equipment off and back on again
to reset.
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