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Av. Kit Install. Manual
190-00067-02 Rev. J
Page 24
except for RS232 channel 2. This channel is only tested at power on and the results
displayed on this page. Therefore the unit must be turned off and the receiver/
transmitter connected or disconnected and then turn the unit on to perform the test.
To test the channels:
RS232 channel 1: Connect RS232 channel 1 receiver and transmitter
RS232 channel 2: Connect RS232 channel 2 receiver and transmitter
RS422: Connect RS232 channel 1 to RS422 LOW (pin 27) and
ground RS422 HI (pin 11)
ARINC 429: Connect ARINC 429 receiver and transmitter
4.3.6 ALTITUDE INPUT TEST
Select the Gray Code Altitude Test Page if this input is used. Verify that the altitude
input is reading the correct altitude. NOTE: This does not display serial altitude.
4.3.7 OBI TEST
Select the OBI Test Page. Using the controls on the GNC 300 front panel, make the
selections indicated below and verify the interfaces as appropriate:
OBI Data
VALID Ensure that the OBI indicates the proper value
INVALID Ensure the OBI is invalid
OBI Value Ensure that the OBI displays the value entered when
the VALID option is selected
NOTE: The 3 lines that make up the OBI interface may be toggled individually. This
may be done from the Value field. Cycle this field to the desired line (either CLOCK,
DATA or SYNC) and toggle the output to HIGH or LOW.
4.3.8 SIGNAL ACQUISITION TEST
The Self Test Page will be displayed followed by the Data Base Page. Upon approval
of the Data Base Page, the Satellite Status Page will be displayed. If unable to acquire
satellites, relocate the aircraft away from obstructions which might be shading
reception. If the situation does not improve, check the antenna installation.
Once GPS position information is available, use the DIRECT-TO key to activate the
navigation function to a nearby NAVAID, intersection, or airport. Ensure any
connected equipment is transmitting data to and/or is receiving data from the GNC
300 and is functioning properly (see the Pilot's Guide for more information on the
DIRECT-TO function).