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RMC – Recommended Minimum Specific GNSS Data
The table below contains the values for the following example:
$GPRMC,053740.000,A,2503.6319,N,12136.0099,E,2.69,79.65,100106,,,A*53
NMEA INPUT MESSAGES
The following outlines the serial commands input into the module for
configuration. By default, the commands are input at 9,600bps, 8 data bits, no
Name
Message ID
Example
$GPRMC
Units
Description
RMC protocol header
parity, and 1 stop bit. SiRF binary commands are input at 38,400bps, 8 data bits,
no parity, and 1 stop bit.
UTC Time
53740
hhmmss.sss
Name
Example
Description
Status
A
A=data valid or V=data not valid
Start Sequence $PSRF
Latitude
N/S Indicator
Longitude
E/W Indicator
2503.632
N
12136.01
E
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
Message ID
Payload
<MID>
DATA
Message Identifier consisting of three numeric
characters. Input messages begin at MID 100.
Message specific data.
CKSUM is a two-hex character checksum as
Speed over ground 2.69
Course over ground 79.65
knots
degrees
TRUE
Checksum
CKSUM
defined in the NMEA specification, NMEA-0183
Standard For Interfacing Marine Electronic Devices.
Checksums are required on all input messages.
Date
Magnetic Variation
100106
degrees
ddmmyy
Not Available, Null Field
Each message must be terminated using Carriage
Return (CR) Line Feed (LF) (\r\n, 0x0D0A) to cause
Variation Sense
Mode
A
E=east or W=west (Not shown)
A=autonomous, D=DGPS, E=DR
End Sequence
<CR><LF>
the receiver to process the input message. They are
not printable ASCII characters, so are omitted from
the examples.
Checksum
*53
Table 10: Serial Data Structure
<CR> <LF> End of message termination
Table 8: Recommended Minimum Specific GNSS Data Example
VTG – Course Over Ground and Ground Speed
All fields in all proprietary NMEA messages are required; none are optional. All
NMEA messages are comma delimited.
The table below outlines the message identifiers supported by the module.
The table below contains the values for the following example:
$GPVTG,79.65,T,,M,2.69,N,5.0,K,A*38
Message
MID
Description
Name
Message ID
Course over ground
Reference
Example
$GPVTG
79.65
T
Units
degrees
Description
VTG protocol header
Measured heading
TRUE
SetSerialPort
NavigationInitialization
Query/Rate Control
100
101
103
Set PORT A parameters and protocol
Reset the modules
Query standard NMEA message and/or set
output rate
Course over ground
Reference
M
degrees
Measured heading (N/A, Null Field)
Magnetic
LLANavigationInitialization
Development Data On/Off
104
105
Reset the modules
Development Data messages On/Off
Speed over ground
Units
Speed over ground
2.69
N
5
knots
km/hr
Measured speed
Knots
Measured speed
PowerManagement
StaticNavigation
Table 11: Message ID Values
200
202
Sets the power performance of the receiver
Sets static navigation On/Off
Units
Mode
K
A
Kilometer per hour
A=autonomous, E=DR
Checksum
<CR> <LF>
*38
End of message termination
Table 9: Course Over Ground and Ground Speed Example
Page 12
Page 13
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