USB-1208-FS-Plus Bit 8 and 9 Both Go Low Together

[Rob R]

This is the code in my FormLoad Event:

       'Configure the Ports to output.
        ulstat = Daqboard.DConfigPort(MccDaq.DigitalPortType.FirstPortA, MccDaq.DigitalPortDirection.DigitalOut)
        If ulstat.Value <> 0 Then
            MessageBox.Show(ulstat.Message, "Universal Library Error ", MessageBoxButtons.OK, MessageBoxIcon.Error)
            Me.Close()
        End If

        ulstat = Daqboard.DConfigPort(MccDaq.DigitalPortType.FirstPortB, MccDaq.DigitalPortDirection.DigitalOut)
        If ulstat.Value <> 0 Then
            MessageBox.Show(ulstat.Message, "Universal Library Error ", MessageBoxButtons.OK, MessageBoxIcon.Error)
            Me.Close()
        End If

        ulstat = Daqboard.DBitOut(MccDaq.DigitalPortType.FirstPortA, 8, MccDaq.DigitalLogicState.Low)
        If ulstat.Value <> 0 Then
            MessageBox.Show(ulstat.Message, "Universal Library Error ", MessageBoxButtons.OK, MessageBoxIcon.Error)
            Me.Close()
        End If

Bit 8 is set to low.  Bit 9 goes low as well.

What is causing this

[Fausto]

Hello @Rob R.

Do you have a new USB-1208FS-Plus or not familiar with the history of your device?  Do you have a spare USB-1208FS-Plus module to test?

With the USB-1208FS-Plus, the digital ports default as inputs when the device is powered on or reset.  

If you comment out the DBitOut() line from your code, do all of the bits go low?

If you change the bit number in your DBitOut() line from 8 to 9, do the surrounding bits go low?

Regards,

Fausto

[Rob R]

I commented out the DBitOut() line.  No the bits stay in the state that they were when the program last shut down.  The problem is that, if Bit 8 and 9 are high when I shut the app down, they are still high when I start the program up the next time.  When this line executes:

 ulstat = Daqboard.DBitOut(MccDaq.DigitalPortType.FirstPortA, 8, MccDaq.DigitalLogicState.Low)

They both go low.  I can't have that.  It causes a crash situation.

Actually if all bits are high, they all go low when the line setting 8 low executes.

I will check to see if this is the case with all of the boards that I have.

 

Edited November 17, 2022 by Fausto
removed contact info