I saw few places reference this NI white paper, titled "RS-232, RS-422, RS-485 Serial Communication General Concepts - National Instruments", paper 11390. If you try NI's white paper link (white-paper/11390/en), it is not there (i don't get to view/download it, or even find it using Search).
I saw only one place where you can download it, but they want me to subscribe to service I don't want ... https://www.scribd.com/document/347320867/RS-232-RS-422-RS-485-Serial-Communication-General-Concepts...
(And I don't want to pay for it tbh .. )
Anyone knows where to get that white paper .. ? Seems to be useful, I sure want to browse it.
I am not aware of any white papers you have to pay for on the NI web site.
As for this specific paper, it showed up in a Google search for me. Like you I end up on the NI web site and no paper.
It could be that the paper has been removed, or moved. Unfortunately the ni.com search engine isn't the best and may not find it for you.
Thanks David
ULib, thanks that's a useful link to know about