DownloadDomain method in VFD Class (c#.net)

[sundara_kalattur]

Hi,

I am developing an application in c# .net for downloading some data in to the FF device. I am using the  DownloadDomain() method for downloading the data. The .net libraries support the DownloadDomain() method in VFD class and cannot be used in MIB class. As per specifications, MIB also should be a VFD but .net libraries are not recognizing MIB as a seperate VFD, instead it is considering MIB as a separate class. Please help me on this.

Regards,

Sundar

[Chris.W]

Hi Sundar,

Could you please try the following?

curVFD = curDevice.GetVfdByOrdinalNumber(0);  // to open the default VFD to get the block information
curVFD = curDevice.GetVfdByTag("MIB");// to open the MIB VFD.

Thanks.

Chris

[sundara_kalattur]

Hi Chris, The first method GetVfdByOrdinalNumber(0) works with 0 as the ordinal and returns the default VFD but the second method GetVfdByTag("MIB") returns an exception stating the VFD could not be found. Regards, Sundar

[Chris.W]

Hi Sundar,

Oh yes, I have done some tests with the C#.net example. You are right, we did give a Mib class for this usage. Would you please refer to the source code piece to get what you want?

**********-----------------------*******************

// ...

Device curDevice;

curDevice.Open();// open device.

curDevice.Mib.Open();// open the Mib

Parameter curParam = curDevice.Mib.ReadParameterByName("T1");// read parameter "T1"

SimpleVarParameter svp = curParam as SimpleVarParameter;// since T1 is a Simple Var Parameter.

// More Parameter Type please refer to readData_Click(object sender, System.EventArgs e) in ReadWrite.cs

MessageStatus.Text += (" " + svp.Element.ValueString());// output the value string to MessageStatus

// ...

**********-----------------------*******************

Please give a try and let me know if it works.

Thanks.

Chris

[Chris.W]

More details, you could also refer to the help file for .Net Library:

C:\Program Files\National Instruments\NI-FBUS\MS .NET\doc\NIFBusCM.HxS

[sundara_kalattur]

Hi Chris,

Thanks for the reply.

I am able to read the parameters from the MIB class but my requirement is to download data into the device. For this, i need to use the DownloadDomain() method. This method is in the VFD class. I am not able to access this method from MIB class. For my operation, i need to download data in MIB vfd.

Is there any way i can call the downloaddomain() method from the MIB.

Regards,

Sundar

[Chris.W]

Hi Sundar,

It might sound weird, but could you please help do a test?

1. Get the Domain Index parameters from class Mib

2. Download Domain using VFD(0) reference.

And let me know if it works this way.

Thanks.

Chris

[sundara_kalattur]

Hi Chris,

We tried this option but unfortunately could not succeed. we are getting an exception when we tried to download to the index which we received in the MIB class.

Regards,

Sundar

[Chris.W]

1. Could you please let me know the exception message?

2. Did you do the same DomainDownload() using C language? and successfully?

Regards,

Chris

[sundara_kalattur]

Hi,

1. I am seeing "FBInvalidDescriptorException" when i try to use the downloaddomain.

2. I tried using the DownloadDomain() API in C. Its working good.

Regards,

Sundar