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2.3 Multiple DAQlink III Unit Operation
Multiple DAQlink III units can be operated simultaneously. A Single DAQlink III can
used to acquire up to 24 channels, Two DAQlink IIIs are required to acquire 48 channels, while
ten DAQlink IIIs are required to record 240 channels.
The GPS receiver on each DAQlink III is normally used to synchronize the multiple
units. (The wired Trigger input can be used to synchronize multiple units if GPS signal is not
available). The GPS time of the trigger event can be sent via the Ethernet connection to all of the
DAQlink III units, if one DAQlink III unit triggers, then all of the DAQlink III units will be
commanded to trigger at the same time.
With GPS timing synchronization, the DAQlink III units only require an Ethernet
connection to acquire seismic data with multiple DAQlink III units. The Ethernet connection can
be either a “Wired” network approach or the Ethernet connection can use “Wireless” Ethernet.
Also, a combination of Wired and Wireless connections can be used to connect the multiple
DAQlink units.
The following products are available from Seismic Source to implement the Network
connection between the DAQlink III units.
“Real time” data acquisition requires an Ethernet connection between DAQlink III units.
“Passive Monitoring” or “Continuous” recording can also be setup with multiple DAQIII
units. In this mode, a network connection between the DAQlink III units is not required. The
data can be ‘Downloaded” after the recording and then processed into ‘Shot” records.
Multi-channel passive recording can be obtained by combining the downloaded records
into the Vscope software.
For Impulsive or Vibrator “shot records, the data must be “Harvested”. The exact Shot
times are used to determine the Shot records. The specific times from each DAQlink III dataset is
collected and sorted into Shot Records using the DAQlink III Harvest software.
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