We have a Viewsonic LS740HD projector connected to a Windows 10 PC with a USB serial adaptor (prolific I think). This produces a port visible in device manager, and works with the GUI in the supplied program (vController).
I want to make the control automatic. I am using Delphi 7 with TComPort on my development system creating a console app. The dev PC is remote from the target. The program fails on the target at the first hurdle. It fails to connect to the port, crashing with