CSI Wireless GBX, Reference Manual

Page: 51 / 109

GBX Reference Manual 31
Table 3-3 Preset GBX GPS NMEA Message Output
GBX GPS NMEA Message
Output
GBX-8M GGA, GSA, GSV, VTG, ZDA
GBX-8A GGA, GSA, GSV, VTG, ZDA
GBX-12R GGA, GSA, GSV, R M C , VTG
GBX-12C GGA, GSA, GSV, VTG, ZDA
GBX-PRO GGA, GSA, SAT , VTG, ZDA
3.5 Beacon Receiver Tune Modes
The GBX may be operated in either Automatic or Manual Tune mode.
In Automatic Beacon Search (ABS) mode, the receiver will
automatically identify and tune to the station providing the strongest
DGPS signal. In Manual Mode, you specify the frequency to which the
receiver will tune, or select the desired beacon by name from the built-
in global listing.
Refer to Figure 3-5, and Section 3.6 to switch between Automatic and
Manual Tune modes using the display and keypad.
3.5.1 Automatic Beacon Search (ABS) Mode
When in GBx, Bx, or Bx-E mode, the GBX operates in Automatic
Beacon Search (ABS) mode by default, selecting and tuning to the
most appropriate beacon without operator intervention. The GBX uses
its two independent channels to identify and lock to DGPS beacons
without interrupting the continuous flow of RTCM data to your GPS
receiver.
ABS mode is ideal for navigation applications over considerable areas,
eliminating the need for operator intervention when transitioning from
one beacon coverage zone to another.