Often times when you unplug and then re-insert Serial-USB converters like the USB-1 cable into your puter it will assign the next higher port number to it. In ARC there is a limit to how high a port number it will accept, is there not? If your puter assigned too high a number to the USB-1 when you plugged it in this time maybe you need to go into device manager and change the port number.
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