TS-7840 GPS

The GPS uses an embedded Telit SL869 module with an externally accessible SMA antenna. This is accessible at /dev/ttyS3 where the GPS provides NMEA strings.

A typical way of interfacing with the GPS is using gpsd. For example, under Debian:

apt install gpsd gpsd-clients -y

Then edit /etc/default/gpsd and change these two options:

# Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
DEVICES="/dev/ttyS3"

# Other options you want to pass to gpsd
GPSD_OPTIONS="-b -n"

Then restart gpsd:

service gpsd restart

This allows clients from command line, or from most programming languages to interface with the GPS through gpsd:

• gpsd writing clients

For testing run "gpsmon" to see lock, coordinates, and time information.