In article ,
Jim Thompson writes:

Further cleaning up in the office found an odd cable... USB on one
end, what looks to be serial on the other??

If you take the serial connector apart, you will find a USB-Serial
chip.

If you plug the USB end into a PC, it should turn into another serial port.
That's /dev/ttyUSBx on Linux systesm, and COMx on Windows boxes.

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These are my opinions. I hate spam.