Setting the Serial Port Buffer Size for Receiving or Transmitting Data with VISA

Updated Dec 20, 2017

Reported In

Driver

  • NI-VISA

Issue Details

I would like to manually set the size of the receive and transmit buffers for my VISA serial resource. How do I do this?

Solution

The I/O (receive and transmit) buffers can be manually set in LabVIEW or LabWindows/CVI.

LabVIEW:


Use the VISA Set I/O Buffer Size function to set the size (in bytes) of the receive or transmit buffer. 



The mask input designates whether to set the I/O receive buffer, I/O transmit buffer, or both. Size is the size of the buffer in bytes. You should set the buffer size to a value larger than the number of bytes you expect to read or write. If size is left unwired, a size of 4096 bytes is used.


 
LabWindows/CVI:

In LabWindows\CVI use the VISA viSetBuf function.

ViStatus viSetBuf(ViSession vi, ViUInt16 mask, ViUInt32 size)
For more information on how to set the mask parameter, refer to the NI-VISA help file for this function.
 

Additional Information

Before you call the VISA Set I/O Buffer Size function, you must call the VISA Configure Serial Port VI to initialize the VISA serial session.   

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