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103 – Query/Rate Control
This command is used to control the output of standard NMEA messages GGA,
GLL, GSA, GSV, RMC, and VTG. Using this command message, standard
NMEA messages may be polled once, or setup for periodic output. Checksums
may also be enabled or disabled depending on the needs of the receiving
program. NMEA message settings are saved in battery-backed memory for each
entry when the message is accepted.
The table below contains the values for the following example:
1. Query the GGA message with checksum enabled
$PSRF10 3 ,00,01,00,01*25
104 – LLANavigationInitialization
This command was used to initialize the receiver with the current position (in
lattitude, longitude and altitude coordinates), clock offset, and time, enabling a
faster fix. Increased receiver sensitivity and the removal of Selective Availability
(SA) have made this unneccessary. The command is retained for its ability to
reset the module, but the initialization fields are no longer supported.
The table below contains the values for the following example:
$PSRF104,0,0,0,96000,0,0,12,4*1A
2. Enable VTG message for a 1 Hz constant output with checksum enabled
$PSRF10 3 ,05,00,01,01*20
3 . Disable VTG message
$PSRF10 3 ,05,00,00,01*21
Name
Message ID
Latitude
Example
$PSRF104
0
Units
Description
PSRF104 protocol header
Name
Message ID
Msg
Mode
Rate
CksumEnable
Checksum
<CR><LF>
Example
$PSRF10 3
0
1
0
1
*25
Units
seconds
Description
PSRF10 3 protocol header
See Table 17
0=SetRate, 1=Query
Output – off=0, max=255
0=Disable, 1=Enable Checksum
End of message termination
Longitude
Altitude
ClkOffset
TimeOfWeek
WeekNo
ChannelCount
ResetCfg
Checksum
0
0
96000
0
0
12
4
*1A
See Table 19
Table 16: Query/Rate Control Example 1
<CR><LF>
End of message termination
0
Value
GGA
Description
Table 1 8 : LLANavigationInitialization Example
1
2
3
4
5
GLL
GSA
GSV
RMC
VTG
Hex
0x01
0x02
0x04
0x0 8
Description
Hot Start – All data valid
Warm Start – Ephemeris cleared
Cold Start – Clears all data in memory
Clear Memory – Clears all data in memory and resets receiver back to
factory defaults
6
7
8
9
MSS (Not Supported)
Not defined
ZDA
Not defined
Table 19: ResetCfg Values
Table 17: MSG Values
1. Default setting is GGA, GLL, GSA, GSV, RMC, and VTG NMEA messages are enabled with checksum
at a rate of 1 second.
Page 1 8
Page 19
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