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Page 4-10 400 SERIES INSTALLATION MANUAL
Page Rev L P/N 190-00140-02
4.5.1.12 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 400 Series unit is operating in the
ILS or GPS Approach modes of operation.
4.5.1.13 DEMO MODE SELECT
This discrete input may be used to select Demo Mode on the 400 Series unit. A low on this pin at time of
unit power-up invokes the Demo Mode. Demo Mode allows the 400 Series unit to simulate reception of
GPS satellite signals.
CAUTION
Do not connect DEMO MODE SELECT in an aircraft installation.
4.5.1.14 TIME MARK OUT
Time Mark Out is a time reference pulse output once per second, derived from GPS satellite signals.
4.5.2 Annunciators/Switches Electrical Characteristics
4.5.2.1 Annunciators
Pin Name Connector Pin I/O
VLOC ANNUNCIATE P4001 1 Out
GPS ANNUNCIATE P4001 2 Out
WAYPOINT ANNUNCIATE P4001 3 Out
TERMINAL ANNUNCIATE P4001 4 Out
APPROACH ANNUNCIATE P4001 5 Out
MESSAGE ANNUNCIATE P4001 6 Out
OBS ANNUNCIATE P4001 7 Out
AUTO ANNUNCIATE P4001 8 Out
INTEGRITY ANNUNCIATE P4001 9 Out
ILS/GPS APPROACH P4001 14 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 P4001 71 In
CDI SOURCE SELECT P4001 73 In
DEMO MODE SELECT P4001 75 In
These 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 V
DC
.
4.5.2.3 TIME MARK OUT
Pin Name Connector Pin I/O
TIME MARK OUT P4001 16 Out
TIME MARK OUT outputs a 1 ms ± 1 µs wide pulse once every 1.0 s ± 2 ms. TIME MARK OUT is a
logic level output, capable of sourcing 1 mA at up greater than 3.8 V and sinking 1 mA at less than 0.4 V.
4.5.3 Annunciators/Switches Configuration
None.
4.5.4 Annunciators/Switches Calibration and Checkout
Refer to section 5.2.8 for the switches checkout. Refer to section 5.2.9 for the annunciators checkout.
4.5.5 Annunciators/Switches Interconnect
Refer to Figure 4-10 on page 4-39 for the annunciators/switches interconnect.
46


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