Guralp Systems CMG-DCM - Manual (Page 29)

Operator's guide
With a sufficiently fast serial link, you can instruct the DCM to send
incoming data directly to a GCF-compatible client. For example,
Güralp Systems' Scream! software allows you to display and record
incoming data, as well as change the settings of attached digitizers.
You can do this in addition to recording data on a local hard disk, or
you can leave the hard disk uninstalled and operate the DCM entirely
over the network link.
This example shows a module communicating with a local PC over a
dedicated radio link. You could also use a simple serial cable to
connect the DCM to the PC.
1. Connect the DCM to a digitizer or digital sensor.
2. Connect the DATA OUT port to a source of 12 V DC power.
3. Either use a computer connected to the NETWORK port to
browse to the DCM's Web site, or log in to the Linux console
over the serial link.
4. Find out the port number of the DCM's DATA OUT port. On the
Web interface, the DATA OUT port is listed by name in the
serial port table.
If you are using the Linux console, use the command gnblocks
to display the port number.
5. On the Web interface, click the Port configuration link for the
DATA OUT port, and set the serial.x.service option to gcf_out.
If using the Linux console, use the command gcfgdbset
serial.x.service gcf_out (see Section 8.2, page 117.)
Note: Beyond this point you will not be able to use the serial
link to access the Web configuration interface of the DCM. If
you do want to be able to do this, you should configure the
serial link for PPP (see “PPP”, page 100) and run a Scream!
server on the DCM. You will need to assign the DCM its own IP
address on your local network.
6. If you connected to the DCM by PPP, you will lose the network
connection at this point, because the DCM is now using the
serial link directly.
7. Open Scream!'s main window, and look under Local in the tree
on the left for the serial port which is communicating with the
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