Veripos LD8 - GGA Precision Selection; Ppp Dqi; Setting Baud Rates; Pps

Configuration and Operation
LD8 Operations Manual AB-V-MA-00635_RevA2 23
4.6.3 GGA PRECISION SELECTION
It is possible to configure the number of decimal places used in the Latitude and Longitude fields output in the
GGA Message. The precision can be set to 5, 6, 7 or 8. When changing the precision value, the same value
should be applied to both the Longitude and Latitude. The command requires to state GGA_LATITUDE or
GGA_LONGITUDE, followed by a precision value detailed in the table below:
Precision
Latitude Command
Longitude Command
5
NMEAFORMAT GGA_LATITUDE 10.5
NMEAFORMAT GGA_LONGITUDE 11.5
6
NMEAFORMAT GGA_LATITUDE 11.6
NMEAFORMAT GGA_LONGITUDE 12.6
7
NMEAFORMAT GGA_LATITUDE 12.7
NMEAFORMAT GGA_LONGITUDE 13.7
8
NMEAFORMAT GGA_LATITUDE 12.8
NMEAFORMAT GGA_LONGITUDE 14.8
4.6.4 PPP DQI
When using either Apex or Ultra PPP services the Differential Quality Indicator is a value reported within GGA
messages to indicate solution status. The LD8 allows for two configurable behaviours for this value.
DQI Behavior
Command Variable
When the calculation is converged to a PPP
service the DQI will report the value 2.
2
When the calculation is converged to a PPP
service the DQI will report the value 5.
5
The below command example shows the behaviour of the DQI when converged for PPP to a value of 2. The
highlighted area below is where the variable of 2 or 5 should be set:
GGAQUALITY 4 OUT_OF_BOUNDS 2 WAAS 2 PPP 2 PSRDIFF 2
4.6.5 SETTING BAUD RATES
The LD8 allows for each Serial Port to be set at different baud rates. The following baud rates are available to
be set: 2400, 4800, 9600, 19200, 38400, 57600 (or) 115200.
To set the baud rate the SERIALCONFIG command should be used along with the port name for the desired
change. An example of the command is below, with the port and baud rate highlighted:
SERIALCONFIG COM1 9600 N 8 1 N OFF
4.6.6 PPS
The LD8 allows for the PPS polarity to be configured and set to an increase in pulse from 0v (POSITIVE) or a
decrease in pulse to 0v (NEGATIVE). The pulse has a width of 2000 microseconds.
An example of the PPSCONTROL command is given below which shows the pulse being set to positive:
PPSCONTROL ENABLE POSITIVE