Garmin GTR 200 User Manual

190-01553-00 GTR 200 Installation Manual
Rev. B Page 4-3
4.4 Serial Data – RS-232
Section 4.4.1.1 and Section 4.4.2 detail the formats that can be selected for the RS-232 channel.
4.4.1 NMEA Format
4.4.1.1 Legacy NMEA Support
The GTR 200 maintains backwards compatibility with legacy SL30/SL40 NMEA commands ($PMMRC
and $PMMRV) as they apply to GTR 200 functionality. Refer to Appendix B
.
The following legacy SL30/40 input commands are supported as-is:
• Set active COM frequency (SL30 version)
• Set active frequency and transceiver function (SL40 version)
• Set standby COM frequency. (SL30 version)
• Set standby frequency and transceiver function. (SL40 version)
• Squelch Override On/Off
• Remote Ident Input
• Remote Frequency List Input
4.4.2 MIC Audio
PILOT MIC IN and COPILOT MIC IN are standard carbon or dynamic MIC inputs with integrated
preamps providing minimum 20 mVrms into a 150 Ω AC load.
PILOT MIC IN and COPILOT MIC IN are set in the factory so that 150 mVrms modulates the transmitter
to 90% nominally at 1000 Hz. The microphone gain adjustment is made through Configuration Mode.
4.5 Aux Mono Audio
Auxiliary audio mono audio inputs have a nominal input impedance of 600 Ω, max. rated input level is
5 Vrms.
Pin Name Pin I/O
RS-232 IN 24 In
RS-232 OUT 23 Out
Pin Name Pin I/O
PILOT MIC IN
17 In
PILOT MIC LO
36 --
COPILOT MIC IN
16 In
COPILOT MIC LO
34 --
Pin Name Pin I/O
AUX MONO IN 1
32 In
AUX 1 LO
31 --
AUX MONO IN 2
9 In
AUX 2 LO
28 --

Garmin GTR 200 Specifications

General

Modulation	AM
Operating Temperature	-20°C to +55°C
Channel Spacing	8.33 kHz / 25 kHz
Transmit Power	10 W
Operating Voltage	14/28 VDC systems
Frequency Range	118.000 - 136.975 MHz