What is the best way to Read RS232 for a long period of time, using VISA?

[chiritab]

What is the best solution to read RS232 if I don't know wend information is send from device to PC? I have a VI that works fine, but if I don't  have any data on serial port I have this error mesage:

"Error -1073807339 occurred at VISA Read in data matrix serial_mod.vi
Possible reason(s):
VISA:  (Hex 0xBFFF0015) Timeout expired before operation completed.."

My VI must work all day and when I receive something on RS232, the VI must  to work properly.

Thanks you.

[Albert.Geven]

Hi

Before starting the read you can use the property bytes at serial port to check if any data is avalable.

If you do that each 100ms or more often when needed you won't miss data and neverhave a timeout on read.

[chiritab]

Do you mean the  "number of bytes at serial port" ? because I don't find "property bytes at serial port".

Thank  you.

[Albert.Geven]

indeed, sorry for the renaming