Guralp Systems CMG-DCM User Manual
Page 17
Operator's guide
6. If you are connecting the DCM to a single computer which does
not run a DHCP server, you will need to configure that computer
to use an IP address on the same subnet as the DCM before they
will be able to reach each other (see “Connecting over Ethernet“
on page 13.)
You should now be able to connect to the DCM's Web setup interface
by typing its IP address into any browser,
e.g.
Scream! and similar software applications should also be configured to
use this address to communicate with the module, if they are intended
to communicate over the network.
Alternatively, you can continue using the gcfgdbset command to set
other configuration options by name. In Chapter 6, each option's name
is given in
italics. The command syntax to use is
gcfgdbset option-name new-value
The options will take effect immediately whenever possible. Some
changes may take some time to complete, since services may need to
be restarted. The gcfgdbset command performs only simple checks
on the new value, so you should check the syntax of the option
carefully.
Wi-Fi
Optionally, a DCM may be supplied with 802.11 (“Wi-Fi”) hardware in
place of Ethernet. There are two modes in which an 802.11 network
may operate:
•
In
ad hoc mode, data packets are sent out over the wireless
connection indiscriminately and are received by all machines
on the network. This is the simplest style of Wi-Fi network, but
consumes more power and cannot easily be extended to large
networks.
•
In
infrastructure mode, dedicated 802.11 hubs collect data
packets, collate, and distribute them efficiently around the
network. These hubs may also act as transparent extensions to
existing (wired) TCP/IP networks.
The DCM is capable of running in either situation, depending on your
requirements. As far as the computers on the network are concerned,
there is no difference between a TCP/IP network running over Ethernet
December 2006
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