Rainbow Electronics GM862-GPS - Manual (Page 114)

GM862-GPS Software User Guide
1vv0300729 Rev. 5 - 05/07/07
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5.7.3 Message 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 command has the following syntax:
$PSRF103,<Msg>,<Mode>,<Rate>,<Checksum Enable>*<checksum><CR><LF>
1. Query 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
4. Enable VTG and GLL sentences
$PSRF103,05,00,01,01*20<CR><LF>
$PSRF103,01,00,01,01*24<CR><LF>
The following table describes the command fields:
Name Example Unit Description
Message ID $PSRF103 PSRF103 protocol header
Msg 00 See next table
Mode 01 0=Set rate, 1=Query
Rate 00 sec Output off=0, max =255
CksumEnable 01 0=Disable Checksum, 1=Enable
Checksum
Checksum *25
<CR><LF> End of message termination
The following table describes the available messages:
Value Description
0 GGA
1 GLL
2 GSA
3 GSV
4 RMC
5 VTG