All NI-DAQmx simulated devices return analog input data in the form of a full-scale sine wave with three percent of full-scale noise. When multiple channels are in the task, the data for each channel is offset five degrees in time. Digital data is always returned as if each eight-bit port were a binary counter. Counter data is always returned as 0. Because NI-DAQmx simulated devices do not simulate timing, data is always immediately available for reading.
Data written to an NI-DAQmx simulated device is scaled as if the device were real. If the scaling succeeds, writes to NI-DAQmx simulated devices always succeed.