Altimeter - Garmin 500 Series Installation Manual

4.3 ALTIMETER

4.3.1 Altimeter Function
Altitude input is required for GPS RAIM calculations, and is useful for advisory vertical navigation
(VNAV) calculations.
4.3.2 Altimeter Electrical Characteristics
Pin Name
ALTITUDE D4
ALTITUDE A1
ALTITUDE A2
ALTITUDE A4
ALTITUDE B1
ALTITUDE B2
ALTITUDE B4
ALTITUDE C1
ALTITUDE C2
ALTITUDE C4
ALTITUDE COMMON
These inputs are considered active if either the voltage to ground is < 1.9 V or the resistance to ground
is < 375 Ω. These inputs are considered inactive if either the voltage to ground is > 18.5 V or the resistance
to ground is > 100 kΩ.
Some transponders and other altitude encoder receivers do not have internal isolation diodes to prevent the
unit from pulling the encoder lines to ground when the unit is off. These units will require a diode to be
added to the installation harness for each encoder line. The anode should be connected on the receiving
unit's side and the cathode should be connected on the encoder side. A set of diodes is required for each
unit without internal diodes. The 500 Series unit includes internal diodes for isolation of the encoder lines.
4.3.3 Altimeter Configuration
None.
4.3.4 Altimeter Calibration and Checkout
Refer to section 5.2.7 for the gray code altitude checkout.
4.3.5 Altimeter Interconnect
Refer to Figure 4-6 on page 4-33 for the altimeter interconnect.
Page 4-6
Page Rev. B
Connector
P5001
P5001
P5001
P5001
P5001
P5001
P5001
P5001
P5001
P5001
P5001
NOTE
500 SERIES INSTALLATION MANUAL
Pin I/O
70 In
69 In
68 In
67 In
66 In
65 In
64 In
63 In
62 In
61 In
60 In
P/N 190-00181-02