Garmin GTX 32 Manuale di installazione - Pagina 30

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4.2

Power Function

Power Input requirements are listed in the following tables. The power-input pins accept 14/28 Vdc.

Switched Power Out is a power source available for devices such as a remote digital altitude encoder.

Refer to Appendix C for power interconnections.

4.2.1 Aircraft Power

Pin Name

AIRCRAFT POWER 1

AIRCRAFT POWER 2

SWITCHED POWER OUT

POWER GROUND

SIGNAL GROUND

4.3

Altitude functions with pin assignments are shown for reference in connection to the GNS 480 (CNX80)

system. When installed as part of a Garmin Integrated Flight Deck system, altitude data is received from

the GIA 63 in RS-232 format.

Parallel gray code altitude 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 the voltage to ground is

11-33 Vdc. Refer to figures in Appendix C for parallel gray code and serial data altitude interconnection.

Carefully check encoder input lines for correct connection after wiring is complete.

The GTX 32 contains internal altitude code line isolation diodes to prevent

the unit from pulling the encoder lines to ground when the transponder is

turned off.

If two separate altimeters are connected to the GTX 32, one providing

parallel gray code and the other, serial data, the unit selects only one for use

at a time, with serial data input receiving the highest priority.

For altimeters that can be connected in both serial data and parallel gray code

format, such as the Garmin GAE 43 (Garmin P/N 013-00066-00), select one

or the other but not both wiring connections.

When connecting two GTX 32 transponders to a GPS, the unit can only

receive RS-232 serial data from one unit at a time. Use a DPDT switch to

connect both serial data and External Standby Select. Refer to Figure C-4

Sheets 1 and 2.

Page 4-2

Revision F

Table 4-2. Aircraft Power Pin Assignments

NOTES

Connector

P3271

GTX 32 Installation Manual

190-00303-60

I/O

Out