Linkway S2 modem
C-34
Appendix C: VMU settings
98-150471-A02
GPS
The $GPGGA command is sent by the ACU to the modem once every 15th seconds. The
format is as follows:
$GPGGA,055751,3732.1619,N,12659.0507,E,0,00,,,M,,M,,*5F
• UTC of Position 055751
• Latitude 3732.1619
• N or S
• Longitude 12659.0507
• E or W
• GPS quality indicator (0=invalid; 1=GPS fix; 2=Diff. GPS fix)
• Number of satellites in use [not those in view]
• Horizontal dilution of position
• Antenna altitude above/below mean sea level (geoid)
• Meters (Antenna height unit)
• Geoidal separation (Diff. between WGS-84 earth ellipsoid and mean sea level. -
=geoid is below WGS-84 ellipsoid)
• Meters (Units of geoidal separation)
• Age in seconds since last update from diff. reference station
• Diff. reference station ID#
• Checksum
C.9.2
ACU configuration
To set-up the ACU to work with an Linkway S2 modem, do as follows:
1. Add a modem profile with the Linkway S2 modem. See
Enter the information from you service provider.
2. Add a satellite profile using the Linkway S2 modem profile just created. See
3. Activate the satellite profile.
See also the configuration example in the following section.
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