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190-00228-20 GPS 16/17 Technical Specifications Rev. C
Page 7
1.7.5 Interfaces
• True RS-232 output (TTL output for GPS 16A and 17N), asynchronous serial input compatible with
RS-232 or TTL voltage levels, RS-232 polarity.
• User selectable baud rate: 300, 600, 1200, 2400, 4800, 9600, or 19200. 38400 available for GPS 16A.
1.7.5.1 Port 1
• Configurable between NMEA 0183 Versions 2.00 and 3.00
• ASCII output sentences GPALM, GPGGA, GPGLL, GPGSA, GPGSV, GPRMC, GPVTG (NMEA-
approved sentences); PGRMB, PGRME, PGRMF, PGRMM, PGRMT, and PGRMV (Garmin
proprietary sentences)
• NMEA 0183 Outputs (see Section 4.2 Transmitted NMEA 0183 Sentences for full protocol
specifications)
Position, velocity and time
Receiver and satellite status
Differential Reference Station ID and RTCM Data age
Geometry and error estimates
• NMEA 0183 Inputs (see Section 4.1 Received NMEA 0183 Sentences 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
1.7.5.2 Port 2
Real-time Differential Correction input (RTCM SC-104 message types 1, 2, 3, 7, and 9)
1.7.5.3 PPS (Not available on GPS 16A or GPS 17N)
1 Hz pulse, programmable width, 1 µs accuracy
1.7.5.4 Power Control (Not available on GPS 16A)
• Off: Open circuit
• On: Ground, or pull to low logic level < 0.3 volts