Guralp Systems CMG-CD24 - Manual (Page 20)

CMG-CD24
2.3.4 Installing wireless hardware
The small antenna supplied with the CD24 is adequate for initial
testing or temporary installations with an access point within 50m of
the digitiser.
To send data over a larger distance, or
if the line of sight between the
antenna and the access point is
blocked, you will need to use a larger
and more powerful antenna.
In infrastructure mode, you can
reduce the power requirements by
using a directional antenna pointed at
the location of the access point. The
access point does not need to be
permanently present. For example,
you could set up an array of CD24
digitisers with antennas pointed
towards a prominent natural feature
with line of sight to all the digitisers,
and access them all from this location
using a laptop PC.
2.4 Configuring the digitiser
Autonomous CD24 installations will need to be configured before
deployment. You can do this either
•
using the graphical interface provided by Scream! (see Chapter 3
on page 25), or
•
over a terminal connection (see chapter 5 on page 53).
Both methods provide full access to the configuration options of the
CD24.
In particular, the CD24 can operate in a number of transmission modes.
These modes determine whether the unit stores data in its on-board
Flash memory, sends it over the serial link in GCF format, or does
some combination of these. See section 3.2.5 on page 40 for more
details.
20 Issue C