Acer S60 User Manual download pdf (Page 12)

AQ-300 Operating Manual

AQ Max Technology Inc. 6F-2, No.90, Sec.1, Chung-Hwa East Rd, Tainan, Taiwan

Fax: ++886 6 2380861 E-Mail: info@aqmax.com Web: www.aqmax.com

Appendix A

Software Interface

The AQ-300 interface protocol is based on the National Marine Electronics

Association's NMEA 0183 ASCⅡinterface specification, which is defined in

NMEA 0183, Version 2.2 and the Radio Technical Commission for Maritime

Services (RTCM Recommended Standards For Differential Navstar GPS

Service, Version 2.1, RTCM Special Committee No.104).

NMEA Transmitted

Messages

The AQ-300 supported by SiRF Technology Inc. also outputs data in NMEA-0183

format as defined by the National Marine Electronics Association (NMEA),

Standard. The default communication parameters for NMEA output are 4800

baud, 8 data bits, stop bit, and no parity.

Table A-1 NMEA-0183 Output Messages

NMEA Sentence Description

GPGGA Global positioning system fixed data

GPGLL Geographic position latitude \ longitude

GPGSA GNSS DOP and active satellites

GPGSV GNSS satellites in view.

GPRMC Recommended minimum specific GNSS data

GPVTG Course over ground and ground speed

Global Positioning System Fix Data (GGA)

Table A-2 contains the values for the following example:

$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M, , , ,0000*18

Table A-2 GGA Data Format

Name Example Units Description

Message ID $GPGGA GGA protocol header

UTC Time 161229.487

Hhmmss.sss

Latitude 3723.2475 ddmm.mmmm

N/S Indicator N N=north or S=south

Longitude 12158.3416

dddmm.mmmm

E/W Indicator W E=east or W=west

Position Fix Indicator

1 See Table 5-3

Satellites Used 07 Range 0 to 12

HDOP 1.0 Horizontal Dilution of Precision

MSL Altitude 9.0 Meters

Units M Meters

Geoid Separation Meters

Units M Meters

Age of Diff. Corr. second Null fields when DGPS is not used

Diff. Ref. Station ID 0000

Checksum *18

<CR> <LF> End of message termination

Table A-3 Position Fix Indicator

Value Description

0 0 Fix not available or invalid

1 GPS SPS Mode, fix valid

2 Differential GPS, SPS Mode, fix valid

3 GPS PPS Mode, fix valid

1 2 ... 7 8 9 10 11 12 13 14 15 16 17

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