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Acquisition Squitter – Acquisition squitter, or short squitter, is the transponder 24-bit identi.cation address. The transmission is sent periodically, regardless of the presence of interrogations.
The purpose of acquisition squitter is to enable Mode S ground stations and Traf.c Collision Avoidance System (TCAS) equipped aircraft to recognize the presence of Mode S-equipped aircraft for selective interrogation.

TRAFFIC INFORMATION SERVICE (TIS)
Mode S provides a data link for Traf.c Information Service (TIS). TIS is a ground-based service that sends out location, direction, altitude and climb/descent information relative to all transponder-equipped aircraft within a radius of 55 miles from select sites.
For aircraft not equipped with TCAS or TAS, TIS provides a graphic display of traf.c information. TIS displays up to eight (8) traf.c targets within 7.5 nautical miles from 3,000 feet below to 3,500 feet above your aircraft. TIS data is updated approximately once every .ve (5) seconds.

NOTE: TIS is intended only to assist in visual acquisition of other aircraft in Visual Meteorological Conditions (VMC).
NOTE: Aircraft without an operating transponder are invisible to TIS.

 

5.2 OPERATION

MODE SELECTION
Mode selection can be automatic (Ground and Altitude modes) or manual (Standby, ON and Altitude modes). The STBY, ON and ALT softkeys can be accessed by pressing the XPDR softkey.
Ground Mode (Automatic)
Ground mode is automatically selected when the aircraft is on the ground. A green GND indication appears in the mode .eld of the Transponder Status bar. In Ground mode, the transponder does not allow Mode A and Mode C replies, but it does permit acquisition squitter and replies to discretely addressed Mode S interrogations.

Figure 5.2.1  Ground Mode

NOTE: Ground mode can be overridden by pressing any one of the Mode Selection softkeys.

Standby Mode (Manual)
The Standby mode can be selected at any time by pressing the STBY softkey. In Standby mode, the transponder does not reply to interrogations, but new codes can be entered. If the Standby mode is selected, a white STBY indication appears in the mode .eld of the Transponder Status bar.

Figure 5.2.2  Standby Mode

NOTE: In Standby mode, the IDENT function is inhibited.

Manual ON Mode
The ON mode can be selected at any time by pressing the ON softkey. ON mode generates Mode A and Mode S replies, but Mode C altitude reporting is inhibited. In ON mode, a green ON indication appears in the mode .eld of the Transponder Status bar.

Figure 5.2.3  ON Mode

190-00382-00 Rev. D Garmin G1000 Transponder Pilot’s Guide

Altitude Mode (Automatic or Manual)
Altitude mode is automatically selected when the aircraft becomes airborne. Altitude mode may also be selected manually by pressing the ALT softkey.
If Altitude mode is selected, a green ALT indication is displayed in the mode .eld of the Transponder Status bar, and all transponder replies requesting altitude information are provided with pressure altitude information.

Figure 5.2.4  Altitude Mode

Reply Status
When the transponder sends replies to interrogations, an R indication appears momentarily in the reply status .eld of the Transponder Status bar.

Figure 5.2.5  Reply Indication

 

CODE SELECTION

Entering a Code
A total of 4,096 discrete identi.cation codes can be selected with the Code Selection softkeys.
To enter a transponder code:
1.  
PresstheXPDR softkeytodisplaythetransponder Mode Selection softkeys.

2.  
Press the CODE softkey to display the transponder Code Selection softkeys, for digit entry.

3.  
Press the digit softkeys to enter the code in the code .eld. When entering the code, the next key in sequence must be pressed within 10 seconds, or the entry is cancelled and restored to the previous code. Five seconds after the fourth digit has been entered, the transponder code becomes active.
　
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