Delphi usb drive serial number4/26/2023 ![]() The problem may be more recognition of the COM port name/number by the software. You may need drivers (from included CD) to be installed. And…when you plug this cable into a USB port, it will identify itself (ala firmare actually in the cable IC) that it is a “COM port” device. ![]() However, USB-to-RS232 conversion cables (perhaps with a module) include built in level converters (charge pumpts, DC/DC converters) which understand the RS-232 voltage levels. It is true that USB provides 5 volts at some nominal current sourcing level (?) and that RS-232 uses +/- 12 volts as its signalling level. The old RS-232 port has no such protocol built into any OS (that I know of). This means, the device identifies what it is when you plug in a USB cable from a gizmo (digital camera, flash drive, etc.). A USB port is much more complicated than RS-232 because it includes the plug-n-play protocol on top of the simple serial interface. ![]() That means, the USB-(insert obsolete port here) market has grown for backward compatibility. Many laptops today do not include RS-232 ports or even parallel ports…They have all moved to USB ports.
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