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GPS Receiver Board
4. Software Interface
The GPS-24 / 24A interface protocol is based on the National Marine Electronics Association's NMEA 0183
ASCⅡ interface specification, which is defined in NMEA 0183, Version 3.0 and the Radio Technical
Commission for Maritime Services (RTCM Recommended Standards For Differential Navstar GPS Service,
Version 2.1, RTCM Special Committee No.104).
4.1 NMEA Transmitted Messages
The GPS-24 / 24A outputs data in NMEA-0183 format as defined by the National Marine Electronics
Association (NMEA), Standard.
The default communication parameters for NMEA output are 9600 baud, 8 data bits, stop bit, and no parity.
Table 4-1 NMEA-0183 Output Messages
NMEA Record
Description
Global positioning system fixed data
GPGGA
Geographic position- latitude/longitude
GPGLL
GNSS DOP and active satellites
GPGSA
GNSS satellites in view
GPGSV
Recommended minimum specific GNSS data
GPRMC
Course over ground and ground speed
GPVTG
Date & Time
GPZDA
Detailed NMEA information is in Appendix A
4.2 RTCM Received Data
The default communication parameters for DGPS Input are 9600 baud, 8 data bits, stop bit, and no
parity. Position accuracy of less than 5 meters can be achieved with the GPS-24 / 24A by using Differential
GPS (DGPS) real-time pseudo-range correction data in RTCM SC-104 format, with message types 1, 5, or
9. As using DGPS receiver with different communication parameters, GPS-24 / 24A may decode the data
correctly to generate accurate messages and save them in battery-back SRAM for later computing.
4.3 Earth Datums
The GPS-24 / 24A is built in earth datum with WGS84.
Rikaline
International Corp.
Tel: ++886 2 2370 4688 Fax: ++886 2 2370 4686 E-Mail:
GPS-24 / 24A Operating Manual
Specifications subject to change without prior notice
10F, 64, Kang-Din Road, Taipei 108, Taiwan
info@rikaline.com.tw
Rikaline
Web: www.rikaline.com.tw
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