AGRICULTURE
This port offers a choice of NMEA positions computed from two different sources:
VERIPOS recommend using “LOCAL” as the default setting. Contact the VERIPOS Helpdesk if further information is required.
Note:
Repeatedly press *Page* to reach the entry point of the main menu:
Press the *Enter* then press *Page* twice. The following screen is shown:
Press the *Enter* key to select the first page of the Serial Port configuration menu, Port P1:
This screen is used to select the source of the NMEA output message. The options are “GPS RX” or “LOCAL”.
Press *Toggle* until the required option is displayed then press *Enter* to select it.
Repeatedly press *Page* to reach the entry point of the main menu:
Press *Enter* followed by *Page* to display the GPS Receiver Configuration menu:
Press *Enter* then press *Page* 4 times to display the Port A Settings menu:
Press the *Enter* to access the first screen in the sub-menu which is shown below:
Press *Enter* to move the cursor to the centre of the screen (NMEA selection mode).
Use the *Toggle* key to move through the list of available NMEA strings.
It is possible to output multiple messages from P1. Each message may be individually enabled or disabled.
To the right of each string ID, the display will show either “OFF” (indicating that it is disabled) or “1.0” (indicating that it is enabled for output at 1 second intervals).
To change the status of the displayed string, press *Enter*.
This will move the cursor to the right of the screen. (Rate selection mode).
Note: For the front panel “GPS” and “DGPS” indicators to be activated either a GGA or a GGX string must be enabled.
The number displayed to the right of the cursor is the output rate for the string.
To disable the string, press *Toggle* until “OFF” is displayed.
To enable the string, press *Toggle* until any other rate is displayed.
Note: The configuration menus offer a choice of rates but these are not fully implemented.
Selecting any value except “OFF” will enable the message at the one second rate.
Press *Enter* to accept the entry and move back to the string selection mode.
Note:
The LD2 can be configured to output the following NMEA messages, either individually or in combination:
Type | Description |
---|---|
GGA |
Global Positioning System Fix Data |
GGX |
Modified version of GGA (Recommended for use with Ultra or Apex positioning) |
GLL |
Geographic position, latitude / longitude |
VTG |
Course Over Ground and Ground Speed |
GSA |
GNSS DOP and active satellites |
GSV |
GNSS Satellites in view |
RMC |
Recommended minimum specific GNSS data |
ZDA |
Date and Time |
GRS |
GNSS Range Residuals |
GST |
GPS Position Error Statistics |
Note:
GGA is the standard positioning message containing essential fix data which provides 3D location and accuracy information.
GGX is similar to GGA but latitude and longitude are specified with increased accuracy (7 characters after the decimal point instead of 5). Because of the increased message length, some systems may be unable to decode it.
These messages are described in detail in the Appendix of the Operations Manual. The manual may be viewed or downloaded from this Web site.