Guralp Systems CMG-DCM User Manual

Page 35

Operator's guide

The DCM allows you to record in several formats simultaneously, if

you wish; you should make sure that you have the capacity to store, or
the bandwidth to transfer, all the data the DCM will produce in each

format you have enabled.

Using SAC format

You can instruct the DCM to record data to Flash (and, later, its hard
disk) in SAC format by setting

disk.recordas.sac to yes.

Compiling SEED volumes

The DCM can also compile full SEED volumes in real time. To enable

this:

1. Edit the /etc/seed.cfg file. The DCM will only write SEED

volumes for streams mentioned in this file. See “SEED
recorder”, page 91, for more details.

2. Browse to the Configuration – Disk page, and set

disk.recordas.seed to yes, or issue the command

gcfgdbset disk.recordas.seed yes

3. Click Save changes to save the configuration and start writing

SEED volumes. One volume will be written for each stream

every three hours. The DCM will always start a new volume if it
is power cycled; the aborted file will still be a valid SEED

volume.

December 2006