LabVIEW 2017 visa read and write performance issue

[beyondgqy]

When I am using the VISA in 8(VISA out 😎 function to read and writ a byte value to the resource. the it sill take about 0.005ms(milisecond) ,which is much slower than expected. I can reach 0.0015ms(milisecond) per operation(read or write) by using other drivers like give io access. why the VISA in 8 or out is much slower than others?how to speed up the access to the PXI driver.

Attached is one of my VI.

[LinXia]

Hi,how did you get the time of 0.005ms,and what the resource did you use?

[beyondgqy]

I use a PC and a PCI to CPCI adapter,and i also get the simular result by using a PXI system from NI.