It is best to say it is possible to troubleshoot RS-232 connections, rather than to claim they are more reliable. There is a limited number of parameters to con

It is best to say it is possible to troubleshoot RS-232 connections, rather than to claim they are more reliable. There is a limited number of parameters to configure, most software made exposed those parameters, and a lot of hardware would document the pinout. That is contrary to USB, which is more reliable yet there is little one can do when things go sideways. That is to say you are either doing something trivial (e.g. trying a different cable or port) or need to be a developer with a very specialized skillset.