500 SERIES INSTALLATION MANUAL
Page 4-11
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Rev
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4.5.1.11 ILS/GPS APPROACH Output
The ILS/GPS Approach output sinks 500 mA when GPS navigation is selected and GPS approach is active
or when VLOC navigation is selected and an ILS channel has been selected. This output may be
connected to the ILS Engage input of an autopilot or flight director to provide higher autopilot gain while
the 500 Series unit is operating in the ILS or GPS Approach modes of operation.
4.5.1.12 DEMO MODE SELECT
This Demo Mode Select input may be used to select Demo Mode on the 500 Series unit. A low on this pin
at time of unit power-up invokes the Demo Mode. Demo Mode allows the 500 Series unit to simulate
reception of GPS satellite signals.
CAUTION
Do not connect DEMO MODE SELECT in an aircraft installation.
4.5.1.13 TIME MARK OUT
Time Mark Out is a time reference pulse output once per second, derived from GPS satellite signals.
4.5.1.14 TAWS ANNUNCIATE
The TAWS annunciator outputs are driven as follows:
x
The red “PULL UP” annunciator is illuminated whenever a warning condition exists.
x
The amber “TERR” annunciator is illuminated whenever a caution condition exists.
x
The white “TERR INHB” annunciator is illuminated whenever the TAWS functionality is
inhibited (either from the 500 Series unit or the external annunciator).
x
The amber “TERR N/A” annunciator is illuminated whenever the TAWS functionality is
unavailable (loss of GPS signal, system failure, out of the area-of-coverage, etc.).
x
All TAWS annunciators are illuminated simultaneously during a TAWS system test.
The TAWS “TERR INHB” discrete input may be used to toggle the TAWS functionality inhibit status.
4.5.2 Annunciators/Switches Electrical Characteristics
4.5.2.1 Annunciators
Pin Name
Connector
Pin
I/O
VLOC ANNUNCIATE
P5001
1
Out
GPS ANNUNCIATE
P5001
2
Out
WAYPOINT ANNUNCIATE
P5001
3
Out
TERMINAL ANNUNCIATE
P5001
4
Out
APPROACH ANNUNCIATE
P5001
5
Out
MESSAGE ANNUNCIATE
P5001
6
Out
OBS ANNUNCIATE
P5001
7
Out
INTEGRITY ANNUNCIATE
P5001
9
Out
ILS/GPS APPROACH
P5001
14
Out
TERRAIN NOT AVAILABLE ANNUNCIATE
P5050
9
Out
TERRAIN WARNING ANNUNCIATE
P5050
10
Out
TERRAIN CAUTION ANNUNCIATE
P5050
11
Out
TERRAIN INHIBIT ANNUNCIATE
P5050
12
Out
All outputs sink up to 500 mA when activated.
4.5.2.2 Switch Inputs
Pin Name
Connector
Pin
I/O
OBS MODE SELECT
P5001
71
In
CDI SOURCE SELECT
P5001
73
In
DEMO MODE SELECT
P5001
75
In
TAWS INHIBIT IN
P5050
1
In
TAWS AUDIO INHIBIT IN
P5050
2
In
Switch inputs are considered active if either the voltage to ground is <1.9 V or the resistance to ground
is <375
:
. These inputs are considered inactive if the voltage to ground is 11-33 Vdc.
Summary of Contents for GNS 530
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