USB6501 switching a resistor (using a digital output) with visual studio (vb.net or C#)

[aloisort]

I am an absolute beginner and trying to work with USB 6501 and vb.net

I want to use a digital output to switch a resistor to an existing one in parallel. Please see the attachment.

MyVB code:

---

   Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        Dim OUT() As Boolean = {True}

        myUSB6501Task = New Task

        'Create a virtual channel

        myUSB6501Task.DOChannels.CreateChannel("Dev3/port0/line0", "", ChannelLineGrouping.OneChannelForAllLines)

        myUSB6501Task.Control(TaskAction.Verify)

        Dim SYS1OUT As New DigitalSingleChannelWriter(myUSB6501Task.Stream)

        SYS1OUT.WriteSingleSampleMultiLine(True, OUT)

   END Sub

---

It does not work and I do not know why.

I am grateful for every hint.

Thanks

Lois

[psuedonym]

I would suggest looking at the example:

C:\Users\Public\Documents\National Instruments\NI-DAQ\Examples\DotNET4.0\Digital\Generate Values\WriteDigPort\VB

[aloisort]

thanks for the example, I did it like this. I see no difference.

Regarding hardware, could anybody have a look at my attached pic?

How to wire this? Does the USB6501 work like a switch (without voltage) or is a voltage output directly?

[psuedonym]

Did you read the manual for the USB6501?

It is a DIO device .

[aloisort]

yes, sure. I just wanna use it as apure DO.

[psuedonym]

As I wrote in the earlier post, you should look at the example program NI installs.

[aloisort]

i don't think that it is a software problem than more a hardware issue. What do you say to my pic posted earlier? Is this ok? I am not a hardware guy 😉

[aloisort]

when I measure resistance between P0.0 and GND, do I measure "endless Ohm" in case of not swithcing and "zero Ohm" in case of switching the output of NI device?

[aloisort]

or does a voltage come out (e.g. 5V when switched and 0V when not switched)?

[psuedonym]

Can't help you any further.

Find someone at your employer to help.