Download LD2 Operations Manual VERIPOS

2 Operation
some early LD2 units).
Press the *Enter* key to select the first page – serial port P1.
NOTE
Access the other ports from here by repeatedly pressing *Page*.
2.7.3.1 Port P1 set up
Port P1 is used to output NMEA data.
The screen below is used to select the source of the NMEA output message.
Options are “GPS RX” or “LOCAL”.
P1: NMEA OUT GPS RX
Press *Toggle* until the required option is displayed then *Enter* to select.
VERIPOS recommend using “LOCAL” as the default setting. “GPS RX”
may be used if demanded by the survey specification (see notes below).
Further advice may be obtained by contacting the VERIPOS Helpdesk.
NOTE
When “GPS RX” is selected the NMEA position data is computed within the
GPS receiver.
When “LOCAL” is selected, the NMEA position is computed by the LD2
PC104 processor using VERIPOS algorithms.
In both cases the computation uses the RTCM corrections configured on port
P2. These corrections are derived from the stations enabled during port P2
configuration.
When in “LOCAL” mode the output baud rate is fixed at 9600 baud.
In “GPS RX” mode it is possible the change the baud rate but this requires
reprogramming of the GPS receiver. If the user wishes to change this setting
it is advisable to contact the VERIPOS Helpdesk for assistance.
The user should now configure the NMEA output strings to be output from
P1.
If “LOCAL” mode is selected, this is done using the GPS receiver port A
configuration settings. Do not be confused by the menu name. Selections
here configure the processor board not the GPS receiver. If “GPS RX” is
required contact the VERIPOS Helpdesk for advice on configuring the GPS
receiver.
Press the *Page* key to step to port P2 set up.
LD2 Operations manual
AB-V-MA-00512
83(144)