Can't Change device driver buffer size

[barak]

Hi,

In NI site i found this note regarding the vi that change the VISA buffer size:

""Note  Not all serial drivers support user-defined buffer sizes. Therefore, some implementations of VISA might not be able to perform this operation. If an application requires a specific buffer size for performance reasons and the VISA implementation cannot guarantee that size, use some form of handshaking to prevent overflow conditions."

How Can i know if in my application i can change the bufer size? 

[EadieU]

Can you please give me a link to where that quote came from?  That will help me track down what it is referring to.  VISA is not just used by NI, it is a standard architecture (Virtual Instrument Software Architecture), so that phrase could have a large number of meanings.  Thank you!

Regards,

Mark E.

Applications Engineer

National Instruments

[Albert.Geven]

This comes from the LabVIEW help (8.5.1)

[EadieU]

The LabVIEW 8.5.1 help is quite extensive.  Can you please point me to where you found this quote?  Thank you

Regards,

Mark E.

Applications Engineer

National Instruments

[Albert.Geven]

I would start looking at set buffersize in the visa menu.

VISA Set I/O Buffer Size Function

Owning Palette: Serial VIs and Functions 

Installed With: Base Package

Sets the size of the I/O buffer. Run the VISA Configure Serial Port VI first if you are setting the size of a serial port buffer.

Note  Not all serial drivers support user-defined buffer sizes. Therefore, some implementations of VISA might not be able to perform this operation. If an application requires a specific buffer size for performance reasons and the VISA implementation cannot guarantee that size, use some form of handshaking to prevent overflow conditions.