Guralp Systems CMG-DCM build <10,000 - Manual (Page 86)

CMG-EAM (Platinum Firmware)
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Duplicate mode - Data are transmitted as if in "direct" mode
and also stored in flash as in "filing" mode although without
the "heartbeat" operation.
The next section of the web page allows the selection of one of two
storage modes, which affect how data are stored in the digitiser's local
flash storage:
Selecting the Reset flash buffers on next digitiser update check-box
will cause all data in the flash storage to be erased and the read
pointers to be reset. Use with caution: data will be erased.
The next section controls two settings associated with data
transmission:
When the digitiser is in the “filing” or “dual” transmission modes,
regular heart-beat messages are sent. This allows software such as
Scream! to be aware of the devices even though they are not sending
sampled waveform data. The frequency of these messages can be set
to an integer number of seconds using the Heartbeat interval text
field.
When the digitiser is in the “adaptive” or “FIFO” transmission modes,
special action is taken if data cannot be transmitted. The
acknowledgement delay field controls how long the digitiser waits for
an acknowledgement packet before assuming that the link has failed.
This should be set to an integer number of milliseconds.
86 Issue C