Configuration and Operation
LD8 Operations Manual
AB- V-MA-00635_RevA6
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4.6.4 Enabling Message Outputs via Terminal
To enable a message, a single command must be sent for each message on each port. Message types can be
output on COM 1-3 or ICOM 1-3. This, along with the message command variable, should be entered in the
command line. The command to be used is given below with COM1 and GPGGA used as an example:
LOG COM1 GPGGA ONTIME 1
LD8 receivers are capable of outputting messages at rates up to 20Hz. The last value as part of the LOG
message is the output rate field. See below table for the output rates and the command variables:
Output rate
Command variable
1Hz
1
2Hz
0.5
5Hz
0.2
10Hz
0.1
20Hz
0.05
An example of the command for outputting GGA on COM 1 at 20Hz:
LOG COM1 GPGGA ONTIME 0.05
4.6.5 Disabling Message Outputs via Terminal
To disable a message from being output, the command below should be issued to the unit. This consists of the
command required, the port and the message type:
UNLOG COM1 GPGGA
To stop all output messages on a single port the command below can be issued stating the port:
UNLOGALL COM1
4.6.6 Setting GGA Precision Selection via Terminal
It is possible to configure the number of decimal places used in the Latitude and Longitude f ields 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
4.6.7 Setting PPP DQI via Terminal
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.