Hi!

Thanks for your reply!

Well, in fact I want to do some "real" data transfer but at first wrote a simple 4 bytes out 4 bytes in test to see how it works. The application I head for, is communication with an embedded system via a console port. That system does not understand any handshaking, therefore my first test uses just that setting. Disturbingly, although I disabled handshaking entirely, Perl complains about a missing RLSD, even when I supply the physical voltage level.

My script is stitched together from example code from the CPAN "man" page of Win32::SerialPort. Anyhow, I will try the examples, maybe they do something different.

Cheers, UltraDMA