I am trying to use a NI-9474 and cDAQ to generate a 5+V square wave at various frequencies. I can get the Counter I/O to output whatever frequency I need, but I only get ~200mV output. If I try using the digital I/O I can't seem to get frequency control to work right. So far I've just been playing with Max and Signal Express. Do I need to have a program to get the digital I/O to work right? It seems the counter I/O does not care about the Vsup from my DC power supply at all?
In playing with the DAQmx I think I can get the desired frequency control, but it is the amplitude I can't get right. Supposed to be able to do up to a 30V output and I can't get over a volt with frequency.
I would try checking that you're wiring is correct using the 9474 Getting Started Guide. What configurations are you using in MAX to set up your data acquisition?
Marco C. Applications Engineering National Instruments
