trig TT21 - 1 Preface; Purpose; Scope; Changes from Previous Issue

TT21/TT22 Transponder Installation Manual 22 August 2017
00560-00 Issue AP
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Trig Avionics Limited 1
1. Preface
1.1 Purpose
This manual describes the physical and electrical characteristics and the
installation requirements for a TT21/TT22 Mode S Transponder and
associated TC20 controller.
1.2 Scope
This document applies to the installation of the TT21 or TT22 Mode S
Transponder.
At the publication date of this manual the software version identifier for the
TT21 and TT22 is 2.12 and the FPGA version identifier is 1.2. The TC20
controller software version identifier is 1.14. The software and FPGA versions
are subject to change without notice.
1.3 Changes from Previous Issue
Changes from Issue AO to Issue AP are:
5.6.7 Squat Switch Input
Addition of note about GPS air/ground
determination.
5.6.9 GPS Position Input
Addition of Trig TN72 GPS.
6.1.9 GPS Line Speed
Addition of TN72 at 9600 bps.
8.3 Mode Selector
Minor editorial change.
12.2 FAA 91.227 Compliance
Reformatted, added Trig TN72.
12.3 CS-ACNS Compliance
Reformatted.
12.5 Automatic Air/Ground
Added GPS air/ground determination.