Instruction manual

5-5 GPS information processing detail
In the EJ-41U, data in the LTXT buffer will be sent out as a beacon. Other than user entered
data placed in the buffer by using the LTXT command, LTXT can be updated automatically with
new data received from the GPS receiver. The following flowchart explains how the LTXT is
automatically updated when a line of GPS data is received.
GPS inputs a line of data
The data is one of SONY/SMAIC/$GPGGA/ YES
$GPVTG/$GPZDA/$GORMC
No No check-sum OK
Analyze GPS data such as date, time,
long, lat. Etc.
Matches GPSTEXT and the initial YES Renews automatically to LTEXT
Data sentence from the GPS?
GPSTEXT is one of $PNTS/$GPGGA GPSTEXT sentence is restructured
/$GPVTG/$GOZDA/$GPRMC? YES and automatically up-dated in LTEXT
NO
End of process
5-6 GPS related commands
5-6-1: GBAUD commands
abbrev.: GB default: variable parameter: 4800/9600
example: GBAUD 4800
Determines the GPS port bit-rate.
4800 for 4800 bps. 9600 for 9600 bps.
Refer also to chapter 5-3-1. 4800 is recommended for NMEA compatible GPS units, 9600 for
SONY GPS. Remember that this command sets bit-rate only, and is not related to the firmware of
the device. The firmware checks SONY/NMEA GPS data by processing the contents of the
receiving data.