Garmin GTX 330 Panduan Instalasi - Halaman 23

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4.4

Altitude Function

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.

The GTX 330 contains internal altitude code line isolation diodes to prevent the

unit from pulling the encoder lines to ground when the transponder is turned off.

Pin Name

ALTITUDE D4

ALTITUDE A1

ALTITUDE A2

ALTITUDE A4

ALTITUDE B1

ALTITUDE B2

ALTITUDE B4

ALTITUDE C1

ALTITUDE C2

ALTITUDE C4

ALTITUDE COMMON

4.4.1

Altimeter Calibration and Checkout

Refer to section 5.2.13 for the gray code altitude checkout.

4.4.2

Altimeter Interconnect, Dual GTX 330 Units

Refer to Figure 4-2 on page 4-7 for Dual GTX 330 altimeter interconnect.

4.5

Discrete Inputs

Pin Name

EXTERNAL IDENT SELECT

EXTERNAL STANDBY SELECT*

SQUAT SWITCH IN

ALTITUDE ALERT ANNUNCIATE*

TIS CONNECT SELECT*

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 the voltage to ground is 11-33 VDC.

EXTERNAL IDENT SELECT (remote IDENT) is a momentary input. Refer to sections 5.2.10. and 5.2.14 for the

squat switch.

Page 4-4

Rev. 1

NOTE

CONNECTOR/PIN

Table 4-5. Encoded Altitude Pin Assignments

Connector

P3301

Table 4-6. Discrete Inputs Pin Assignments

I/O

P3301 11

P3301 2

P3301 4

P3301 5

P3301 7

P3301 9

P3301 10

P3301 8

P3301 3

P3301 6

P3301 50

I/O

Out

GTX 330 Installation Manual

190-00207-02