Guralp-systems CMG-3ESPCD Manual de usuario descargar pdf (Pagina 55)

CMG-3ESPCD Digital Broadband Seismometer Using Scream!

5.2.5 Data flow

The digitiser operates in one of several transmission modes. These modes

relate to how the unit uses its Flash memory:

• as a simple data store, from which you can request data (FILING and

DUAL modes);

• as a buffer holding unacknowledged blocks, which are transmitted in

preference to real-time data (FIFO mode);

• as a buffer holding unacknowledged blocks, which are transmitted

whenever the channel is free but no real-time data blocks are ready

(ADAPTIVE mode);

• not at all (DIRECT mode).

Separate from these modes are buffering modes, which tell the unit what to do

when its Flash memory becomes full: either

• carry on, overwriting the oldest data held (RECYCLE), or

• stop writing and switch the digitiser transmission mode to DIRECT

(WRITE-ONCE).

You can switch between transmission modes in Scream! by right-clicking on

the digitiser and clicking on Control..., then navigating to the Data Flow pane:

Clicking Apply in this window immediately activates the transmission mode

you have selected—there is no need to reboot. If you prefer, you can use the

digitiser terminal to switch between transmission modes. The commands to

use, which take effect immediately, are given below.

MAN-C3E-0002 55 Issue B - November 2013

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Guralp-systems CMG-3ESPCD Manual de usuario Pagina 55