Guralp Systems CMG-6TD User Manual
Page 68
Configuration with Scream!
5.2.5.5 ADAPTIVE
Syntax: ADAPTIVE
Instructs the 6TD to transmit current blocks to clients if possible, but to store
all unacknowledged blocks in the Flash memory and re-send them, oldest
first, when time allows. ADAPTIVE mode is best suited for “real-time”
installations where the link between digitiser and client is intermittent or
difficult of access.
If the communications link is only marginally faster than the data rate, it will
usually be busy transmitting real-time data. Thus, it may take a while for the
instrument to work through the missed blocks. In this case, and if your client
supports it, you may prefer to use the Block Recovery Protocol to request
missed blocks where possible.
Some software packages (most commonly Earthworm) cannot handle blocks
being received out of time order. If you are using such a package, ADAPTIVE
mode will not work, and may crash the software.
5.2.5.6 DUAL
Syntax: DUAL
Instructs the 6TD 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 instrument will send heartbeat messages as for FILING mode.
Scream! can pick these up and download new data as necessary.
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Issue F - February 2014