Linx Technologies RXM-GPS-FM - Manual (Page 11)

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RMC – Recommended Minimum Specific GNSS Data
Figure 15 contains the values for the following example:
$GPRMC,053740.000,A,2503.6319,N,12136.0099,E,2.69,79.65,100106,,,A*53
Recommended Minimum Specific GNSS Data Example
Name Example Units Description
Message ID $GPRMC RMC protocol header
UTC Time 053740.000 hhmmss.sss
Status A A=data valid or V=data not valid
Latitude 2503.6319 ddmm.mmmm
N/S Indicator N N=north or S=south
Longitude 12136.0099 dddmm.mmmm
E/W Indicator E E=east or W=west
Speed over ground 2.69 knots TRUE
Course over ground 79.65 degrees
Date 100106 ddmmyy
Magnetic Variation degrees Not available, null field
Variation Sense E=east or W=west (not shown)
Mode A
A=autonomous, D=DGPS, E=DR, N=
Data not valid, R=Coarse Position,
S=Simulator
Checksum *53
<CR> <LF> End of message termination
VTG – Course Over Ground and Ground Speed
Figure 16 contains the values for the following example:
$GPVTG,79.65,T,,M,2.69,N,5.0,K,A*38
Start-up Response
The module outputs a message when it starts up to indicate its state. The
normal start-up message is shown below and the message formatting is
shown in Figure 17.
$PMTK010,001*2E<CR><LF>
Course Over Ground and Ground Speed Example
Name Example Units Description
Message ID $GPVTG VTG protocol header
Course over ground 79.65 degrees Measured heading
Reference T TRUE
Course over ground degrees Measured heading (N/A, null field)
Reference M Magnetic
Speed over ground 2.69 knots Measured speed
Units N Knots
Speed over ground 5.0 km/hr Measured speed
Units K Kilometer per hour
Mode A
A=autonomous, D=DGPS, N=
Data not valid, R=Coarse Position,
S=Simulator
Checksum *38
<CR> <LF> End of message termination
Figure 15: Recommended Minimum Specific GNSS Data Example
Figure 16: Course Over Ground and Ground Speed Example
Start-up Response Example
Name Example Description
Message ID $PMTK010 Message header
Message MSG
System Message
0 = Unknown
1 = Start-up
2 = Notification for the host supporting EPO
3 = Transition to Normal operation is successful
Checksum CKSUM
End Sequence <CR> <LF> End of message termination
Figure 17: Start-up Response Example