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NMEA Manual based on MediaTek chipset - Manual

1 NMEA default output messages

IT500 series receivers support standard NMEA0183 messages.

In the default configuration, output messages are GGA, RMC, GSV and GSA messages. The receiver can be

configured to have a user defined set of output messages, by command PMTK314 as described in chapter 2.12.

For IT530M and UC530M modules, VTG message will be output by default.

Output messages are utilized in Fastrax Workbench 5 to visualize the GPS/GNSS data. Default output messages

cover most of the applications.

The NMEA standard differentiates between GPS, GLONASS and combined GNSS receivers using a two-letter

message identifier, known as the “Talker ID”. By default, IT530M and UC530M receivers are configured to

support GPS and GLONASS concurrently use the “GN”, “GL” and “GP” talker IDs. Table 1 shows “Talker ID”

used in individual operation modes of IT530M/UC530M modules.

Operation mode Talker ID

GPS + GLONASS hybrid (defualt)

GP, GN, GL

GPS only

GP, GL

GLONASS only

GP, GN, GL

Table 1: Talker ID used in IT530M and UC530M for different constellation modes

For IT530M and UC530M module:

GGA and VTG messages will only use “GP” talker ID for GPS only, GLONASS only and GPS+GLONASS

concurrent operation modes.

In GPS only mode: the incomplete GLGSV message shown as “GLGSV,1,1,00*65” (SV-info missing) should

be ignored.

In GLONASS only mode: the incomplete GPGSV messages with empty SNR-field indicate that GPS satellites

are not in track.

1.1 GGA - Global Positioning System Fix Data

Time, position and fix related data for a GPS receiver.

Example:

$GPGGA,114353.000,6016.3245,N,02458.3270,E,1,10,0.81,35.2,M,19.5,M,,*50

Format:

$GPGGA,hhmmss.dd,xxmm.dddd,<N|S>,yyymm.dddd,<E|W>,v,s,d.d,h.h,M,g.g,M,a.a,xxxx*hh<CR><LF>

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Cayman Systems 2E-H-W Manual de usuario Pagina 5