CMG-DCM / AM - Güralp Systems Limited

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CMG-DCM Data Communications Module 11.In the next window, check that the correct hardware is shown, and click OK to confirm. 12.You can now remove the hard disk from the computer and reinstall it in the DCM if required. 3.3 The DCM as a GCF data source 28 Issue F
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 December 2006 29
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