Important; Software Interface; Nmea Transmitted Sentences - Holux GM-210 User Manual

3. After the installation is complete, go to <Device Manager> and select <Ports (COM & LPT)> to verify if a
virtual COM port <USB to Serial Port> was created.

4.3 Important

Verify the COM port # to start using your own navigating software.
1. Click <Start> menu, select <Settings>, then enter <Control Panel>.
2. After entering <Control Panel>, select <System>.
3. Select <Device Manager>.
4. Find the <Connect port> and check the Virtual COM Port, which was created by the USB driver,
Please note that the Virtual COM Port number might be different from every computer. Before using
navigating software, please confirm the COM Port numbers created by your computer and provided by
your navigation software. Otherwise, the navigating software won't receive the satellite signal, because of
the un-match COM Port setting.

5. Software Interface

The GM-210 interface protocol is based on the National Marine Electronics Association's NMEA 0183 ASC
Ⅱinterface 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, Type 1,2,9) or WAAS (in USA area) or EGNOS (in European area)
).
5.1 NMEA Transmitted Messages
The GM-210 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 5-1 NMEA-0183 Output Messages
NMEA Record
GPGGA
GPGLL
GPGSA
GPGSV
GPRMC
GPVTG
5.1.1 Global Positioning System Fix Data (GGA)
Table 5-2 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 5-2 GGA Data Format
Name
Message ID
UTC Time
Latitude
N/S Indicator
Longitude
E/W Indicator
Position Fix Indicator
Satellites Used
Description
Global positioning system fixed data
Geographic position- latitude/longitude
GNSS DOP and active satellites
GNSS satellites in view
Recommended minimum specific GNSS data
Course over ground and ground speed
Example Units
$GPGGA
161229.487
3723.2475
N
12158.3416
W
1
07
Description
GGA protocol header
hhmmss.sss
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
See Table 5-3
Range 0 to 12
HOLUX
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