Guralp Systems CMG-DCM - Manual (Page 25)

Operator's guide
2. Connect the DATA OUT port to a source of 12 V DC power.
3. Connect the unit to your local network as described in Section
2.4, page 15, and perform any necessary configuration of the
DCM and digitizer. You will be prompted for a username and
password: log in as root and use the password supplied by
Güralp Systems. If you have not been given a password, use the
default password rootme. You should change this password as
soon as you can.
4. The DCM will immediately begin recording data into Flash
memory as it is received, and every so often data will be moved
onto the internal hard disk. At this point you can leave the DCM
running without assistance.
Data is stored in the Flash memory as a number of files in
Güralp Compressed Format (GCF) unless you have specified
another option. Once the memory becomes 75% full, files are
automatically moved to the hard disk until it is less than 50%
full. (See Section 8.1, page 116, for details of the algorithm
used.)
You can check that the DCM is receiving data either by
monitoring the Summary page of the on-board Web interface
(see Section 4.1, page ) or from a command prompt using the
command
gnblocks
This command displays details about all of the DCM's serial
ports, and the number of GCF blocks received so far on each
one. To see information about a single port, type
gnblocks port-number
5. If the internal hard disk is missing or becomes full, and you
have chosen the USB host option, the DCM will automatically
look on the USB interface for an external USB mass storage
device.
6. To replace the internal hard disk, unclip the cover of the DCM
and hold down the lever button to bring the disk out from its
housing.
December 2006 25