Using A Robotic Total Station (Rts) Or Other External Device - Geometrics MetalMapper 2x2 Operation Manual

(empty field) time in seconds since last DGPS update
(empty field) DGPS station ID number
*47
Set the GPS to output a standard NMEA GGA string at 1 or 10 Hz. The baud rate must match
the baud rate defined in the application.properties file (which is the baud rate displayed in the
Project Settings tab).
To edit the GPS type and Baud rate, open the application.properties file located at
etc/opt/MetalMapperII
with the program Mousepad.
BEFORE EDITING THE FILE MAKE A BACKUP COPY STORED ELSEWHERE!

7.4 Using a Robotic Total Station (RTS) or other external device

The MetalMapper 2x2 software can also collect positioning information from a device that
outputs a pseudo-NMEA GGA string. An example of this is an RTS system where the Robotic
Total Station is set up at a known location and tracks a prism mounted to the GPS Tower on the
sensor cart. The position information is sent from the RTS via radio or Bluetooth to a logging
computer carried by the operator, which then feeds the Pseudo-NMEA string into the
electronics via RS-232 serial. The acquisition software has been tested with many
manufacturers' pseudo-NMEA RTS strings. Please check with Geometrics if your RTS system is
supported prior to starting a project relying on an RTS system.
A sample Pseudo-NMEA GGA string is shown here:
$GPGGA,145717.56,14704746.36,N,1188130.37,E,1,05,1.0,680.94,F,0.0,M,0.0,0001*4D
The stored positions in the HDF5 data file may show a "NULL" value if the RTS laser loses sight
of the prism during operation.
the checksum data, always begins with *
40