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ComNav Vector G2 & G2B Installation & Operation Appendices
Document PN 29010078 V2.0 - 75 -
DRAFT #3 – 29 May 2009
Use the New Connection to the G2
Now that you have your connection set up, you can use it:
Re-start the HyperTerminal session: click on the Call button (see Figure 25).
If you want to monitor both
of the G2’s ports, start another HyperTerminal session,
setting it up the same as above, but on another COM port (COM 6, for the G2’s Port
B, in the screen shots here). Position it on your PC’s display so that you can see
both sessions simultaneously (see Figure 28, below for an example).
Power up the G2.
After a few seconds, you should begin to see data coming from the G2 in the
HyperTerminal session(s). Initially, all the data fields in the G2’s output sentences
will be empty; then, within a minute or so (depending on how many GPS satellites
with good signal strength can be seen by the G2), the Position & Date/Time fields will
start to have valid data, followed after another few minutes or so by heading data.
Note: if you are using a USB-to-Serial adapter (see page 32), you may
find – depe
nd
ing on the brand of the adapter and/or the version of its
driver software – that you must “make the Call” with the G2
disconnected from the DE9 end of the adapter, or perhaps even with
the G2 turned off.
The symptom of this condition will be that HyperTerminal brings up a
message box that says “Can not open COM port x” when you click on
the Call button.
Using a different brand of adapter, and/or a different driver, may solve
the problem.
Example Data Displays
On the following pages, there are several examples of what a typical PC display looks like
while monitoring the G2’s data outputs with HyperTerminal (two sessions, with Port A’s on
the left of Port B’s, and after several minutes of operation):
The Vectors used for the following examples were both G2Bs, configured with the
ComNav factory defaults on both ports (see Table 6 & Table 7). They were located
outsid
e
ComNav’s office, on the usual test site – a low bush just outside the Service
Department door. Each was aligned to point approximately West, with a clear view of
the Southern sky (about 200° horizontally centered on ~180° True, and about 90°
vertically, from ~10° above the Southern horizon to ~100° overhead); there were
some cars parked nearby, but none within 3 metres, and no other metallic surfaces
nearby.
As can be seen in the example data outputs, 7 (of the 11 or 12 visible) GPS satellites’
signals were used by the G2Bs in the GPS data processing & position/heading/etc.
computations.
The nearest Beacon transmitter is about 6 Km away (the Canadian Coast Guard’s
Richmond, B.C. site), and its signal was good during all the tests.
All the tests shown in the screen shots were run with the G2B’s Differential data
source (JDIFF) set to BEACON. Then, at a later point in the tests (shown only in
some of the “typical data listing” figures), JDIFF was set to WAAS; there were two
SBAS satellites visible – and PRN #135 was selected by the G2B, as is usually the
case here at ComNav.
www.busse-yachtshop.de | info@busse-yachtshop.de
77


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