Guralp Systems CMG-DM24 User Manual

Page 33

Operator’s Guide DM-24 Digitiser

Issue G January 2003

BUFFERING – DATA STORAGE

If fitted, the digitiser can contain silicon memory modules, the size of which would
appear in the window. Data would then be stored in the digitiser rather than being
continually transmitted. The ‘Heartbeat’ function is then be set to periodically register
to the user that the instrument is still functioning.

BUFFERING – FLASH DATA STORAGE

There are 3 modes available to the user with the digitisers that have the flash memory
fitted (standard of 16Mb) with other options available up to 512Mb. These include
normal, adaptive and filing. To change between these modes, open the terminal
connection to the digitiser and type either direct , adaptive or filing ; the unit does not
need to be re-booted.

Normal Mode

is where the digitiser ignores the flash file installed and continues

operation as normal.

Adaptive Mode

will result in the unacknowledged data (i.e. the interruption of the

serial output) being recorded by the flash file. When the connection is restored, both the
real-time and recorded data are transmitted.

Filing Mode

causes the digitiser to record all the data to the flash in a circular buffer.

When in this mode, the unit transmits only ‘heartbeats’ which are just status messages
informing the user that it is recording data. When in this mode, and it is required that all
the recorded data be transmitted, right click on the digitiser icon and click download.