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RoyalTek RGM-3000/REB-3000
GPS Module Operational Manual)
18
Table 12 Query/Rate Control Data
Format(See example 1.)
1.Quety the GGA message with checksum
enabled: $PSRF103,00,01,00,01*25
2.Enable VTG message for a 1 Hz
constant output with checksum enabled:
$PSRF103,05,00,01,01*20
3.Disable VTG message
$PSRF103,05,00,00,01*21
Table 12 Query/Rate Control Data Format(See example 1.)
Name Example Units Description
Message ID $PSRF103 PSRF102 protocol header
Message 00 See Table 13
Mode 01 0=Set Rate, 1=Query
Rate 00 seconds Output – off=0,max=255
Cksum Enable 01 0=Disable Checksum, 1=Enable Checksum
Checksum *25
<CR><LF> End of message termination
Table 13 Messages
Value Description
0 GGA
1 GLL
2 GSA
3 GSV
4 RMC
5 VTG
LLA Navigation Initialization
This command is used to initialize the
module for a warm start , by providing
current position(in latitude, longitude, and
altitude coordinates), clock offset, and time.
This enables the receiver to search for the
correct satellite signals at the correct signal
parameters . Correct initialization
parameters enable the receiver to acquire
signals quickly.
Table 14 contains the input values for the
following example: Start using known
position and time $PSRF104, 37.3875111,
-121.97232, 0, 95000, 237759, 922, 12,
3*3A
Table 14 LLA Navigation Initialization Data Format
Name Example Units Description
Message ID $PSRF104 PSRF104 protocol header
Lat 37.3875111 Degrees Latitude position (Range 90 to –90)
Lon -121.97232 Degrees Longitude position (Range 180 to –180)
Alt 0 Meters Altitude position
CLK Offset 95000 Hz
Clock Offset of the Evaluation Unit
1
Time Of Week 237759 Seconds GPS Time Of Week
Week No 922 GPS Week Number
Channel Count 12 Range 1 to 12
Reset Cfg 3 See Table 15
Checksum *3A
<CR><LF> End of message termination
Use 0 for last saved value if available. If this is unavailable, a default value of 96,000 will be used.
Table 15 Reset Configuration
Hex Description
0x01 Data Valid – Warm /Hot Starts=1
0x02 Clear Ephemeris – Warm Start=1