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190-00266-01 GPS 15H & 15L Technical Specifications Rev. D
Page 6
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1.5.5 Interfaces
1.5.5.1 GPS 15H & 15L Electrical Characteristics
True RS-232 output (Port 2 output not used at time of publication), asynchronous serial input
compatible with RS-232 or TTL voltage levels, RS-232 polarity.
User selectable NMEA 0183 baud rate (300, 600, 1200, 2400, 4800, 9600, 19200, 38400). Factory
setting is 4800 baud.
1.5.5.2 Port 1 Protocols
Configurable between NMEA 0183 Versions 2.00 and 3.00.
ASCII output sentences: GPALM, GPGGA, GPGLL, GPGSA, GPGSV, GPRMC, and GPVTG
(NMEA-approved sentences); and PGRMB, PGRME, PGRMF, PGRMM, PGRMT, and PGRMV
(Garmin proprietary sentences).
NMEA 0183 Outputs (see section 4.2 for full protocol specifications)
Position, velocity and time
Receiver and satellite status
Differential Reference Station ID and RTCM Data age
Geometry and error estimates
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NMEA 0183 Inputs (see section 4.1 for full protocol specifications)
Initial position, date and time (not required)
Earth datum and differential mode configuration command, PPS Enable, GPS satellite almanac
• Configurable for binary data output including GPS carrier phase data
1.5.5.3 Port 2 Protocols
Real-time Differential Correction input (RTCM SC-104 message types 1, 2, 3, 7, and 9)
1.5.5.4 PPS
1 Hz pulse, programmable width, 1 μs accuracy
1.5.6 Antenna Specifications
Should be an active antenna with the following specifications:
Gain: Antenna should provide between 10 dB to 30 dB net gain between the
antenna feed point and the connection to the GPS 15H & 15L. Consider all
amplifier gains, filter losses, cable losses, etc. when calculating the gain.
RF Connection: GPS 15H & 15L RF Connection: MCX Female connector (on the GPS
15H & 15L board).
Antenna Connection: MCX Male connector (on the end of the antenna
cable).
Garmin Antenna: GPS 27C (Garmin Part Number 010-10052-05) provides the required
MCX Male connector. Other Garmin antennas terminated in a BNC Male
connector may also be used if a Garmin MCX to BNC Adapter Cable
(Garmin Part Number 010-10121-00) is used. Place the MCX to BNC
Adapter Cable between the connector on the end of the antenna cable and
the connector on the GPS 15H & 15L.