Multichannel Systems MC_Rack Manual - Manual (Page 68)

MC_Rack Manual
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Triggering on Stimulation Pulses from Internal STGs
It is possible to trigger on stimulation pulses from any of the three internal stimulus generators.
The three internal STG units send a trigger signals with each stimulation pulse on bits 4, 5 and 6
of the digital channel, Stimulus 1 on bit 4, Stimulus 2 on bit 5 and Stimulus 3 on bit 6. Please see
chapter “Use of the Digital Channel in the MEA2100” for more details. So to trigger, for example
on each pulse of Stimulus 1, a Trigger detector in MC_Rack must be set to the Digital Channel,
bit 4. Please see screenshot below.
It is also possible to set the trigger detector to react on a signal from any of the three STG units.
This might for example be useful to start a triggered recording if a stimulus is applied from any
of the STG units. All three bits must be unmasked, and the bit value must be defined as > 0.
See chapter “Triggering on TTL Pulses” for more information.
Triggered recording and any instrument which is below the Trigger Detector in the virtual tree
of MC_Rack can now work in relation to the selected STG unit(s).
Real-time Feedback with MEA2100-System
Important: The Real-time Feedback function is not available for the MEA2100-32-System!
The interface board of the MEA2100-System is equipped with a high-capacity digital signal
processor DSP. By moving the detection and analysis of signals from the data acquisition computer
to the digital signal processor inside the interface, it is possible to run online filtering, analysis and
feedback stimulation in real-time. Please read also chapter “Real-time Feedback”.
At the moment, the real-time feedback is available for one instance of MC_Rack, that means
for one MEA2100-HS60, one MEA2100-HS120, or one MEA of a MEA2100-HS2x60.
By default, eight of the 16 bits of the digital channels are permanently assigned to the Real-time
Feedback function. For each of these eight bits, a different condition can be defined to release
a trigger signal. These eight bits can be monitored with the Digital Display. See also “Use of the
Digital Channel in the MEA2100”. The Real-time Feedback trigger signals are available in the
“Trigger Detector”, and can also be directly selected to start the internal stimulus generators.
See also chapter “Starting and Stopping the Stimulation”.