briand@aracnet.com wrote on 05/28/2015 09:47 PM: > what is the physical port, is it an actual rs-232 ? Yes. ( Amazingly, such things do still exist :-) ) But I figured it out this morning. I was being completely misled by the error message that came from the application, which made it seem that the port was being found and configured, but wasn't working; none of which was true. The real problem was two-fold: 1. /dev/ttyS4 in Kubuntu was /dev/ttyS0 in debian. 2. Kubuntu sets permissions so that everyone can access the port; debian does not. Once I had changed the configuration of the application so as to access /dev/ttyS0, and added the user to the dialout group, all the problems went away. Since it's an open-source application, I shall change its error messages to be more informative. Doc -- Web: http://www.sff.net/people/N7DR
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