This source module makes it possible to stream analog and digital data from National Instruments hardware. The module can acquire data from multiple PXI-based and/or USB-based National Instruments (NI) devices simultaneously. The NIDAQmx module can also be used in tandem with the Neuropix-PXI plugin, to read in analog and digital inputs in parallel with Neuropixels data.
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The editor will automatically generate control buttons for each analog and digital input available on the currently selected NI device. Each analog channel contains a channel status toggle button as well as a terminal configuration toggle button. The channel status toggle button is set to on (green) by default for all channels and is intended to enable/disable channels on the fly. Toggling an enabled channel to off (gray) will 'zero-out' the data coming in on that channel.
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On the right side of the module are pull-down selection menus to select the sample rate and voltage range of all analog input channels (set individually for each channel). The module defaults to the highest sample rate as well as the largest voltage range available on the devices. Sample rate and voltage range selection is are both disabled during data acquisition and recording.
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To align timestamps across devices, one device has to be treated as the "master" clock, and all other sets of timestamps must be scaled and shifted to match this clock. This requires that a digital sync line is shared across all devices. If you're using a PXI-based NI module with a Neuropixels basestation, the Neuropixels sync line will be connected to DI0. For any other configurationFor now, you'll need to manually connect a sync line to one of the digital input lines on all of your devices. If you don't already have a solution for this, we recommend using an Arduino running the sync-barcodes program, which generates unique temporal barcode patterns every 30 s. This will allow you to align sample clocks accurately, even if your devices are stopped and started at different times.
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