User manual

SeaSTAR 3100LRS USER MANUAL
Issue 1.0 08/02
6
Model 3100LRS / VBS or VRC Mode Setup
In this mode a composite set of RTCM corrections is computed from the GPS
network data sent over the link. The following information is required to
compute these corrections; time (supplied via the link), GPS almanac data
(supplied via the link), and receiver location either entered via the front panel or
from an external GPS receiver interfaced via the AUX port. When the unit is
first supplied, or not used for a long period of time, or moved a large
distance between use it may take up to 40 minutes to start outputting
RTCM corrections.
• If the 3100LRS is operating in VBS/VRC mode the RTCM data will appear
on the AUX port, this port will need to be set up to match the requirements
of your GPS receiver RTCM IN/NMEA out port, use the User Settings -
Aux. Port menu item to set these.
• For the VBS or VRC operation the 3100LR needs to be supplied with a
position for the area of operation, this can be supplied automatically from
an external GPS receiver or manually via the front panel using the VBS
POS menu item. If using an external GPS input the GPS receiver must be
set up to output either $xxGGA or $xxGLL NMEA format position
telegrams in addition to any other required message types. The NMEA
data is input via the AUX port, therefore the port parameters must match
those set for the RTCM data output, see the set up details for this port
above.
• The NMEA data input via the AUX port echoed to the DATA port for
connection to user equipment, the data port can be set up independently
of the AUX port using the User Settings
- Data Port menu item.
Figure 3 3100LRS operating in VBS or VRC Mode
3100LRS
Receiver
GPS Receiver
Laptop Computer
(Configuration & Maintenance)
DGPS Antenna
DC Power Supply
(Typically vehicle cigarette lighter or
12V DC sealed lead acid battery)
AUX Port
Power
DGPS
Data, Command
or Utility Port
FSPAS Ref.: B31005102PMBRA0