Multichannel Systems MC_Rack Manual - Manual (Page 123)

MC_Rack Features
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To display data and manual trigger, please select the desired data streams in the “Data” tab
of the display. The display has to be placed in dependency of the Trigger Detector 1 in the
virtual tree.
When replaying a Rack file with manual trigger events, the timestamp and its number will appear
in one channel of the display. Using the MCS default two dimensional channel map, the marker
will appear on channel 47, using the one dimensional MCS default channel map, the marker
appears on channel 1.
Important: The manual trigger is enabled, when MC_Rack data acquisition is running only!
Important: The manual trigger is enabled in continuous mode of recording!
4.9.2 Triggering MC_Rack
The Trigger Detector detects trigger events on a single input channel and generates a Trigger
data stream that can be used to trigger other virtual instruments, for example, to control the
Recorder or an Analyzer. Several Trigger streams can be generated by separate Trigger
Detectors. You can use Electrode or Analog Raw Data, Filtered data, Parameter, or Digital Data
streams as input streams for trigger detection.
 You can define a bit pattern for using digital signals (TTL pulses) as a trigger.
 You can define a threshold for triggering on biological signals.
 You can define a threshold for triggering on extracted parameters.
 You can also program an automatic time-based trigger.
4.9.3 Triggering on TTL Pulses
The digital input channel is generally used for synchronizing the (USB) MEA- or ME-System to
a stimulus generator, or to another data acquisition system, for example, an imaging or a patch
clamp system. Only TTL signals are accepted as input signals on the digital input bits. You can
apply TTL pulses to single digital input bits, or you can encode a bit pattern by combining multiple
digital input bits.
Important: The applied TTL signal should not be too short, depending on the sampling rate,
for example, it should be at least 40 μs at a sampling rate of 50 kHz. Otherwise, it can happen
that the MC_Card or the USB based data acquisition misses signals.