RS232 serial communication

[Dennis_Knutson]

Data is always read from the buffer. Unless the buffer is flushed, the contents will remain even if you disconnect the instrument. That is why I asked about the VISA Bytes at Serial Port function. This will read the number of bytes in the buffer. You can wire the results of this to the VISA Read byte count input. If the instrument is constant sending data, all you want is the latest, and your program is unable to keep up, then before you do a read, you can do a flush buffer first (VISA Flush I/O Buffer).

[PIPL]

Dear Dennis

Thanks once more.

Now one more thing.

What is that 'mask' input for the VISA flush vi

[Dennis_Knutson]

Right click on the function and select Help. It gives you all of the values and explains what each one is.

[PIPL]

i 've gone to help.

But i didnt understand anything

Anyway its working now with a value of 64 as mask even if i dont know what it mean.