USGlobalsat ET-333 - Manual (Page 13)

ET-333
Specifications are subject to be changed without notice.
Page 13 of 15
Version 1.3.1
This command is used to control standard NMEA data output messages: GGA, GLL, GSA, GSV, RMC,
and VTG. Using this command message, standard NMEA message is polled once, or setup for
periodic output. In addition, checksums may also be enable or disable contingent on receiving
program requirements. NMEA message settings are stored in a battery-backed memory for each entry
when the message is accepted.
Format:
$PSRF103,<msg>,<mode>,<rate>,<cksumEnable>*CKSUM<CR><LF>
<msg> 0=GGA,1=GLL,2=GSA,3=GSV,4=RMC,5=VTG
<mode> 0=SetRate,1=Query
<rate> Output every <rate>seconds, off=0,max=255
<cksumEnable> 0=disable Checksum,1=Enable checksum for specified message
Example 1: Query the GGA message with checksum enabled
$PSRF103,00,01,00,01*25
Example 2: Enable VTG message for a 1Hz constant output with checksum enabled
$PSRF103,05,00,01,01*20
Example 3: Disable VTG message
$PSRF103,05,00,00,01*21
E.) LLA Navigation initialization ID:104 Parameters required to start using Lat/Lon/Alt
This command is used to initialize the GPS module for a “Warm” start, providing real-time position
(Latitude, Longitude, Altitude coordinates), clock offset, and time. This action enables the GPS
receiver to search for the necessary satellite signals at the correct signal parameters. The newly
acquired and stored satellite data will enable the receiver to acquire signals more quickly, and thus,
generate a rapid navigational solution.
When a valid LLA Navigation Initialization command is receive, then the receiver will restart using the
input parameters as a basis for satellite selection and acquisition.
Format:
$PSRF104,<Lat>,<Lon>,<Alt>,<ClkOffset>,<TimeOfWeek>,<WeekNo>,
<ChannelCount>, <ResetCfg>*CKSUM<CR><LF>
<Lat> Latitude position, assumed positive north of equator and negative
south of equator float, possibly signed
<Lon> Longitude position, it is assumed positive east of Greenwich
and negative west of Greenwich Float, possibly signed
<Alt>
Altitude position float, possibly signed
<ClkOffset>
Clock Offset of the receiver in Hz, use 0 for last saved value if
available.