VISA read timeout error at high sampling rate

[oPeY]

I use VISA Write to send the command "FAST2" to an SR830 lock-in amplifier, which then send data to a GPIB-USB-HS cable connecting to the computer. I use a loop to performing VISA Read again and again to receive data from the cable. Each time 4 bytes data are received.

The program performs well if the sampling rate of SR830 is set to 256Hz. However, when using 512Hz, I got "error -1073807339: VISA:  (Hex 0xBFFF0015) Timeout expired before operation completed."

Any comments will be appreciated.

[Omar_II]

The 4 bytes you are looking for did not arrive at your port before it timed out passed.

You are reading faster than the stuff is getting to the com port

• Check for bytes at port before reading.
• Set the time out longer

[weitong]

Have  you solved the problem? I meet the same problem now.

WT

LV2013

[cbutcher]

Dear Weitong,

This thread is 7 years old and has only two previous posts - you might receive better help by creating a new thread of your own. When you do so, please describe the problem you're having and upload your VI so that we can take a look at what you're doing.