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USB is a four wire wire system with two power lines and two data lines. There are no physical control lines.
RS232 has physical control and data lines.... So what you are asking for simply won't work....or worse will fry something...hence the need for a USB to RS232 converter.
Use of RS232 has nothing to do with manufacturers wanting you to buy their cables....but a lot to do with providing a simple, cheap and effective mount control from a PC.
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