TT21/TT22 Transponder Installation Manual
22 August 2017
00560-00
AP
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Trig Avionics Limited
The TT21/TT22 GPS input can recognise the following protocols:
Industry standard “Aviation” protocol
NMEA 0183 protocol ($GPRMC sentence is required)
Freeflight and Accord NexNav GPS proprietary protocols
Garmin ADS-B protocol, including ADS-B plus
Trig ADS-B protocol
C199 TABS compliant GPS using NMEA protocol
Trig TN72 GPS protocol
The interface speed can be selected between 4800, 9600, 19200 and 38400
bps.
Some of the protocols listed above may not contain all the required data for a
compliant ADS-B message, depending on the intended airspace regulations.
For further information refer to Section 12 (ADS-B Compliance) of this
manual.
5.6.10
TIS Traffic Output
The TIS traffic is an RS232 output and supports the display of uplinked Traffic
Information Service messages. The TT21/TT22 TIS output can drive the Trig
proprietary traffic protocol, and can also support the format used by certain
Garmin handheld displays, including the 495, 496, 695 and 696.
Note: TIS is a Mode S uplink service that is provided by some US
approach radars. TIS coverage is limited to the coverage areas of
those radars. There is no TIS provision outside the USA.
5.7 TC20 Controller Electrical Connections
The TC20 controller has a single 9 way D type male connector to link to the
transponder, and optionally to connect to a GPS for baro-aiding.
