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MK XXII EGPWS Installation Manual
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-225 REV: C
SHEET
176
E 4.2.13 OAT VOLTAGE REFERENCE OUTPUT
This output is an accurate voltage source for 500
Ω
resistive temperature sensors.
Quantity 1
Output Voltage
5.000 VDC
±
10 mVDC (no load)
Nominal Load
500
Ω
Pin Assignment (Signal Mnemonic): J1-25 (OAT_REF)
NOTE: This output has a source impedance of 4.42 K
Ω
, 0.1%.
E 4.2.14 LAMP DRIVER OUTPUTS
The MK IV, VI, VIII and XXII EGPWS supports two kinds of Ground/Open discrete outputs used to signal various discrete
conditions. Monitor outputs are used to signal failure conditions for the MK IV, VI, VIII and XXII EGPWS. Monitor
outputs default to an active state when there is a failure or if power is removed from the MK IV, VI, VIII and XXII EGPWS.
The other Lamp Driver outputs are used to signal the alert or mode control status of the MK IV, VI, VIII and XXII EGPWS.
Short-term current limit protection is provided on all drivers for output shorting conditions. Ground going output discretes
may be connected together to produce a “wired OR” function for the active low state of the signals. If output discretes are
“wired or’ed” then diodes must be installed for isolation.
E 4.2.14.1 MONITOR OUTPUT CHARACTERISTICS
Quantity 3
Type of Output: Switch Closure to Ground
Max. Open Circuit Voltage: 30 VDC
Current Limit 1 Amp
Potential Across “Closed” Switch: 2.5 VDC Max
Pin Assignment (Signal Mnemonic): See specific output in Category 13 (MON_OUT_xx)
NOTE: Intended to operate with +28VDC lamp sources and will not operate with +5VDC lamp sources.
E 4.2.15 DISCRETE OUTPUT CHARACTERISTICS
Quantity 9
Type of Output: Switch Closure to Ground
Max. Open Circuit Voltage: 30 VDC
Current Limit 500 mAmp (typical)
Potential Across “Closed” Switch: 1 VDC Max
Pin Assignment (Signal Mnemonic): See specific output in Category 13 (DISC_OUT_xx)
E 4.2.16 AUDIO OUTPUTS
There are two audio outputs provided – one 8-ohm output and one 600-ohm output. There are several possible volume levels
available with the MKIV/VI/VIII/XXII EGPWS as shown below, with maximum output being 4W (8Ω) or 100mW (600Ω).
The actual audio level output by the EGPWS is dependent on several items:
• Selection of nominal alert audio volume level (max, -6, -12, -18 or -24 dB) via Category 14. (Section 5.3.14)