Guralp Systems CMG-DM24 User Manual

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CMG-DM24

oldest in memory. If, instead, the WRITE-ONCE buffering mode is

active, the instrument will switch to DIRECT mode (see above) when
the memory becomes full.

You can retrieve blocks from an instrument in FILING mode by

connecting to its terminal interface and issuing commands such as
FLUSH, or through Scream! (see below).

Heartbeat messages
When in FILING mode, an instrument transmits “heartbeat” messages
over its data port. These short messages take the place of data blocks,

and ensure that programs such as Scream! know that an instrument is
present.

You can change the frequency of heartbeat messages from Scream!'s
Control window, or with the command HEARTBEAT.

DUPLICATE
Command: DUPLICATE

Instructs the DM24 to transmit streams directly to clients as for
DIRECT mode, but also to store all data into Flash storage as for
FILING mode.

If a client fails to acknowledge a block, the digitizer does not attempt
to retransmit it.

DUAL
Command: DUAL

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