MDEV-GPS-F4 datasheet(10/25 Pages) LINX

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NMEA Output Messages

The following sections outline the data structures of the NMEA messages

that are supported by the module. By default, the NMEA commands are

output at 9,600bps, 8 data bits, no parity 1 start bit and 2 stop bits.

GGA – Global Positioning System Fixed Data

Figure 10 contains the values for the following example:

$GPGGA,053740.000,2503.6319,N,12136.0099,E,1,08,1.1,63.8,M,15.2,M,,0000*64

Global Positioning System Fixed Data Example

Name

Example

Units

Description

Message ID

$GPGGA

GGA protocol header

UTC Time

053740.000

hhmmss.sss

Latitude

2503.6319

ddmm.mmmm

N/S Indicator

N=north or S=south

Longitude

12136.0099

dddmm.mmmm

E/W Indicator

E=east or W=west

Position Fix Indicator

See Figure 11

Satellites Used

Range 0 to 12.

HDOP

1.1

Horizontal Dilution of Precision

MSL Altitude

63.8

meters

Units

meters

Geoid Separation

15.2

meters

Units

meters

Age of Diff. Corr.

second

Null fields when DGPS is not used

Diff. Ref. Station

0000

Checksum

*64

End of message termination

Position Indicator Values

Value

Description

Fix not available or invalid

GPS SPS Mode, fix valid

Differential GPS, SPS Mode, fix valid

3–5

Not supported

Dead Reckoning Mode, fix valid

Figure 10: Global Positioning System Fixed Data Example

Figure 11: Position Indicator Values

GLL – Geographic Position – Latitude / Longitude

Figure 12 contains the values for the following example:

$GPGLL,2503.6319,N,12136.0099,E,053740.000,A,A*52

GSA – GPS DOP and Active Satellites

Figure 13 contains the values for the following example:

$GPGSA,A,3,24,07,17,11,28,08,20,04,,,,,2.0,1.1,1.7*35

GPS DOP and Active Satellites Example

Name

Example

Units

Description

Message ID

$GPGSA

GSA protocol header

Mode 1

See Figure 14

Mode 2

1=No fix, 2=2D, 3=3D

ID of satellite used

Sv on Channel 1

ID of satellite used

Sv on Channel 2

...

ID of satellite used

Sv on Channel 12

PDOP

2.0

Position Dilution of Precision

HDOP

1.1

Horizontal Dilution of Precision

VDOP

1.7

Vertical Dilution of Precision

Checksum

*35

End of message termination

Geographic Position – Latitude / Longitude Example

Name

Example

Units

Description

Message ID

$GPGLL

GLL protocol header

Latitude

2503.6319

ddmm.mmmm

N/S Indicator

N=north or S=south

Longitude

12136.0099

dddmm.mmmm

E/W Indicator

E=east or W=west

UTC Time

053740.000

hhmmss.sss

Status

A=data valid or V=data not valid

Mode

A=autonomous, D=DGPS, N=Data

not valid

Checksum

*52

End of message termination

Figure 12: Geographic Position – Latitude / Longitude Example

Figure 13: GPS DOP and Active Satellites Exampl

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