NorthStar 1200-02-01, Installation Manual

Page: 25 / 56

Section Two—Installation Instructions
M3 GPS INSTALLATION MANUAL Revision D PAGE 21
with the M3’s output to reduce the current drive. A “superflag” out-
put also is provided.
•
To/From Pointer — Wire as shown in Figure 9, using the switching
device as described above. Note: A higher drive voltage (
±
120 mV) is
available. Contact the factory for information.
•
Localizer Energize Output — This output is provided for connec-
tion to autopilots requiring a signal to enable flying a coupled
approach. It is logically identical to the
APCH
annunciator output, but
is electrically isolated from it. Like the annunciator outputs, this sig-
nal functions as a grounding switch, active low, and is limited to a
maximum of 30 VDC and 200 mA.
Altitude encoder
wiring
Interface to an encoding altimeter is required for IFR installations and is
recommended for VFR use. The M3 has both a parallel and a serial inter-
face available: either may be used. The serial interface requires the North-
star 2006 Altitude Serializer, which is already installed in many aircraft
being upgraded from an M2 to an M3.
To use the parallel interface, connect the 11 wires as shown in Figure 9. If
the altitude encoder does not provide an
ALTITUDE VALID
signal, see the
note on Figure 9.
To use the serial interface, follow the directions in the
Northstar 2006 Alti-
tude Serializer Installation Manual (
Part No. GM435).
Be sure to designate which interface is used with the appropriate
SETUP
command, described in
“Designating the altimeter data interface”
beginning
on page 25.
Serial interface
wiring
Two-conductor shielded twisted pair, such as Belden 9501 or
MIL-C-27500, is recommended for interconnecting equipment connected
to serial ports. The shield should be connected to chassis ground at both
ends of the cable.
The M3’s output data is binary coded, and includes latitude, longitude, sig-
nal status, SNR, ground speed, track angle, waypoint identification and
location, cross-track error, magnetic variation, distance and bearing to
waypoint, and flight plan information.
•
RS-485 Port for fuel management systems and/or moving map
display
— This equipment must be configured to accept the Northstar
data format. Be sure to specify this format when purchasing these
units.
•
Northstar C1 Communications Transceiver — To interface to the
optional Northstar C1 Communications Transceiver, please refer to