Iscrete Utput - Garmin GDL 90 Installation Manual

Ext
External connections
ON = One or more external systems have disconnected or failed
OFF = No external system failure
GPS
GPS Status
Flashing = GDL 90 is acquiring GPS position
Steady ON = GPS position has been acquired
OFF = system failure
Status
GDL 90 System Status
ON = GDL 90 has failed. Perform troubleshooting procedure and
maintenance check.
OFF = GDL 90 is functioning satisfactorily.
2.8.4 D
ISCRETE
Discrete outputs can be used to drive annunciator lamps or provide status information to other equipment.
Unless otherwise indicated, they are active low (i.e. grounded when active, and open otherwise) and open
collector output capable of sinking up to 400 mA.
2.8.4.1 UAT Fail / GPS Status Output
P2-25 UAT Fail Out
The UAT Fail Out (P2-25) is used to indicate the status of the GDL 90 or status of its internal GPS
engine. The function of this discrete output can be configured via the APM setup (refer to Section 3.0.)
Using the APM initialization, the UAT Fail Out can be configured to behave as follows:
As UAT Fail Indicator
As GPS Status Indicator
2.8.4.2 Transponder Suppression Output
P2-21 Suppression Out
The Suppression Out is used to indicate to on-board transponder that the GDL 90 is transmitting and
therefore inhibit the transponder from transmitting. The Suppression Output is an active signal and will
be active high when on-board transponder should be suppressed and grounded when transponder is free
to transmit.
GDL 90 Installation Manual
O
UTPUT
The UAT Fail Out will be grounded when the GDL 90 has detected a
system failure. This output will be open otherwise.
The UAT Fail Out will be grounded when the GDL 90 has acquired
valid GPS position. The UAT Fail Out will flash (i.e. alternate between
being open and grounded) at a 1 Hz rate when the GDL 90 is searching
but has not acquired a position. The UAT Fail Out will be open if the
GDL 90 has detected a system failure.
560-1049-00 Rev B
Installation Procedures
2-15