Multichannel Systems STG4004+STG4008 Manual - Manual (Page 54)

Stimulus Generator 4000 Series Manual
50
Independent Channel Download
The second option is to use the feature “Independent Channel Download” which is available
in the Settings menu. This feature allows downloading a new stimulation paradigm to
individual channels only, while all other channels continue with their former program without
stopping. To allow this, the memory space of the STG is divided among all available
channels. For example, when using a STG4008, the memory is divided in 16 parts, for eight
Sync Out channels and eight stimulation channels, so the memory space for each channel is more
limited than in default mode. If a stimulation pattern is too large for the available memory
partition, no download is possible.
Note: It is recommended to operate the stimulus generator in default mode. The “Independent
Channel Download” feature should only be used if one STG is connected to more than one
recording system, and if those recording systems should be operated independently.
8.1.2 Independent Channel Download
The “Independent Channel Download” can be activated in the Settings menu. As mentioned
above, it allows downloading of new paradigms to individual channels without stopping all
other channels, but also leads to limited memory availability.
This feature is primarily intended to be used with MEA-Systems with multiple amplifiers
and only a single STG. See chapter “Operating multiple MEA amplifiers with one STG”.
If the independent download option is active, a click on the Download or Download and Start
button will only download a new paradigm to the channels selected in the Download Channel
check box (1 and 6 in this example). Other channels will not be influenced.
However, the individual download option is influenced by the Trigger Settings. To be able
to download channels independently from each other, it is mandatory that these channels are
assigned to different triggers.
If a new paradigm is downloaded to one channel, all channels assigned to the same trigger
will also be stopped, even though no new paradigm is send to this channel.
Each time you change any parameter in the “Trigger Settings” dialog, the running stimulation
will be stopped automatically. You have to start the stimulation again manually.