What is the main difference between the digital output (DO) of the U2100A, U2600A, U2300A and U2500A?
The DO port of U2100A and U2600A requires external power supply to be pumped into the port through a load because it doesn't generate by itself a voltage to output through the DO port but rather, these DO ports are used to sink in current from an external power supply to the internal ground within the DAQ.
For U2300A and U2500A, both are able to generate TTL voltage from it's DO with Vol = 0.45V (max) and Voh = 2.4V (min)
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