serial message based device

[pigmeo]

Hi, I need to read data from serial device. System works by this way: User must send a message by pressing the button on the device physically. So I don't know, when the message is transfered to serial port and when can I read this by function VISA read.

It should work this way: My VI should wait until the data are at the port and then the data should be read. May be it could be done by usage events, but I don't know how to use this function. Thank you for your help.

[Albert.Geven]

search for the function (property node) bytes available.

searching in LanbVIEW can be done by pinning a (block diagram) palette to the desktop and then click on the magnifying glass.

[pigmeo]

I can't find property bytes avilable. I have found only bytes at port. Is it the right property?I am a beginer in LabView.Can you send me an example, how can I read from serial port in not exactly specified time(with waiting loop)?Thank you

[Albert.Geven]

bytes at port is ok

use the "wait ms" function (watch) to wait, check a moment later the number of bytes available and read only those.