read USB data without using VISA!

[jylok1]

it is possible to read the data from USB port in LABVIEW without using the VISA function???

thank you!!!!!

[MikeS81]

Hi jylok1,

can you please give more details? Do you mean the raw data or do you have a special device connected to this port?

Mike

[jylok1]

hey there, i'm using ultrasonic sensors through basic stamp device. the device is connected to the PC through USB port.

there are continously data transmitted from the sensors through the USB port.

i can acquire the data using the VISA function. however, the VISA slows the sampling rata alot compare with the original signal.

thank you!

[jjcimon]

what is slow and fast for your application?

what is the size of the data?

could you change the type in the basic stamp  like I8 instead U8(just X10) to get I8....

did open and close are outside the main reading loop? 

[jylok1]

actual rate is about 50 samples per second...but it became bout 8 samples after VISA function.

the VISA function is in the while loop....

i never use the close function. it is a must?

[jjcimon]

post your vi I ll take a look