Guralp Systems CMG-CD24 - Manual (Page 46)

CMG-CD24
Instructs the CD24 to transmit continuous streams directly to clients
as for DUPLICATE mode, but to store triggered data only into Flash
storage.
If you choose DUAL mode but do not select any continuous streams for
output, the digitiser will send heartbeat messages as for FILING mode.
Scream! can pick these up and download new data as necessary.
3.2.6 Buffering modes
3.2.6.1 RE-USE / RECYCLE
Syntax: RE-USE
Instructs the CD24 to carry on using the current filing technique when
the Flash memory becomes full, overwriting the oldest data held. This
buffering mode is called RECYCLE in Scream! and on the DCM.
For example, in DUAL mode with RECYCLE buffering, the latest
continuous data will be transmitted to you as normal, and the latest
triggered data may be retrieved from the Flash memory using Scream!
or the command line. However, if you do not download data regularly
from the Flash memory, you may lose older blocks. This mode thus
lets you define the end point of the data held by the digitiser.
3.2.6.2 WRITE-ONCE
Syntax: WRITE-ONCE
Instructs the CD24 to stop writing data to the Flash memory when it is
full, and to switch to DIRECT mode automatically.
For example, in FIFO mode with WRITE-ONCE buffering, the station
will transmit data to you continuously, but also save them in the Flash
memory until it is full. Once full, the digitiser will switch to DIRECT
mode and continue transmitting, though no further data will be saved.
This mode thus lets you define the start point of the data held by the
digitiser.
46 Issue C