Simrad AP26 and AP27 Autopilots
110 20221586B
NMEA signal monitor
Near the NMEA terminals in the Autopilot Computer you will
find a green monitor LED marked “RX”. A flickering LED
indicates that a NMEA signal is received. It does not, however,
qualify the contents of the message.
Note ! Do not mix up the “RX” LED with the LED marked “TX”. The
“TX” LED will always be lit or flickering when the autopilot is
on.
NMEA Port test (AC hardware)
Disconnect the cables on the Main PCB in the Autopilot
Computer and connect TX1+ to RX1+ and TX1- to RX1-.
Similarly, on the Power PCB connect the NMEA ports the same
way; TX2+ to RX2+ and TX2– to RX2–.
Under Service in the Installation
Menu, select NMEA port test by
pressing the STBD button and
confirm this by rotating the
course knob clockwise.
Verify that the hardware is OK.
If not, replace the corresponding
PCB(‘s).
Proceed to the SimNet Setup menu by pressing the STBD
button, or press STBY to return to normal autopilot operation.
SimNet setup
Under Service in the Installation
Menu, select Simnet setup by
pressing the STBD button and
confirm this by rotating the
course knob clockwise.
Sn 00000 is the unique SimNet
ID number for the specific
autopilot control unit.
Group selection
SIMRAD: Autopilot is part of
the Simrad Group. Source
selection will be common for the
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