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Hi, i have the USB-6009 and i am trying to read in through a digital line with DAQ Assistant. When i test the port it doesn't change state when i enter different voltage levels, the same is true when used in a LabVIEW program. Any help would be appreciated.
You simply need a pull down resistor for wach of the digital inputs. If you do not do thins, you can set the digital input high, but you will never be able to set the value low again.
I hope this helps
AdamB
Applications Engineering Team Leader | National Instruments | UK & Ireland