Go to local

[Mindy_Gortling]

I am using VBA excel with GPIB command.

Two instruments A and B talk to each other through buses controlled by firmware in A and B seperately. After talk, results displayed on screen of instrument A.

I can read result through GPIB connected with A correctly: 

I used VBA:

call GPIBinit

call ibwrt (xxx,xx)

call ibrd(xxx,xx)

But I noticed part of the screen on A is blank now.

I understand I have to release control, so A and B will talk to each other correctly. I used:

call ibwrt(xxx, "*CLS")

call ibwrt(xxx, "*RST")

call ibwri(xxx, "GTL")               

close visual basic code window

None of them working, I have to close excel sheet.

Can any one tell me which command to used at the end of sub to release the control? I don't want to close excel each time.

Thank

Mindy                     

[PTerro]

Hi Mindy_Gortling,

The command for Request/release system control is ibrsc.  Here is a pdf with all the commands for VB:

http://www.ni.com/pdf/manuals/320418.pdf

Let me know if that answers your question!!

[Mindy_Gortling]

HI, Peter T

Your suggestion is not working.

Here is my code:

Private Sub Test()

  Dim Id As String

  Dim T As Integer

  Call GPIBinit              ' instrument A result still on screen, means A and B still talk

  Id = Space$(100)        ' instrument A result still on screen

  Call ibwrt(10, "*IDN")   ' part of screen on A is blank, means my code take control

  Call ibrd(10, Id)

  .

  .

  .                                'my code successfully obtain the results from A

  Call ibrsc(10, T)         ' your suggestion not working, part of screen still blank. I have to close excel, screen will be back to normal

End Sub

Do you have more command I can try to release the control? Call ibwrt(10, "GTL") not working also.

Mindy_Gortling

[Mindy_Gortling]

HI, Peter T

Do you have any other suggestions I can try? Anybody has good suggestion?

Thanks

Mindy_Gortling

[Evan_S]

Hi Mindy_Gortling,

I have a few questions which might help get to an answer. What devices are you using/communicating between? Where is the screen that is half blank located/connected?

[Mindy_Gortling]

Hi, Evan

The device A and B I am using to communicate is our own product. When hooked up using a cable, some select will on A. After I choose the selection, auto testing will start and result will be on left screen of A. More selection on the right screen of A will let me choose how to continue.

I used GPIB connected with A to get the result successfully, but the continue selection on the right screen disappear.

Good thing is I used  "call ibloc (xx) " and the problem solved.

Thanks.

Mindy_Gortling

[martinmark]

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