TT26 ADS-B Transponder Installation Manual
24 January 2017
01633-00
Issue AC
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14
Trig Avionics Limited
The following diagram shows the connector orientation as viewed from the
wiring side.
5.5 TT26 Transponder Interface Details
5.5.1
Power Input
The power supply can be 11-33 volts DC; no voltage adjustment is required.
Use a 3 Amp (or greater) circuit breaker for power supply protection to the
TT26.
It is always good practice to use more than one ground wire in an installation.
This is particularly important when the transponder is mounted on a non-
conducting surface, such as a composite structure. With only one wire there
could be only a single grounding path for the transponder, controller and
antenna.
5.5.2
TMAP Control Port
TMAP is a Trig serial protocol that provides a bi-directional interface between
the TT26 and a control system. The protocol is documented in
DEV/TMAP/005 Enhanced TMAP Protocol Specification.
Depending on configuration options the TT26 may be controlled by the TMAP
RS-485 bus on pins 2, 3, 8 and 9, or by TMAP over RS-232 on pins 24 and 25.
Check which option you have before proceeding.
