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If you want to connect an RS232 peripheral to a computer with USB ports then that is easy, search this forum, you can buy a USB uart chip, connect wires and load the driver from the manufacturer. There are lots of threads about this.
If you want to connect a USB peripheral to a computer with RS232 then that is a very hard project. RS232 is much slower then USB so it could only be done for low bandwidth devices like a keyboard or a mouse. You will have to have build a device which acts as a USB host and talks to the PC using serial. You will need to write a low level driver that interfaces with the windows USB stack. You may have problems with latency due to protocol overhead and buffering on the serial.
Hi,
As mentioned the converter needs to be specified in a certain direction either PC-RS232 to USB or PC-USB to RS232. The latter case is much more simple and I suppose is something similar than the devices used to provide notebooks with RS232 ports. In that case the chips from FDTI or even a PIC18F with USB can do the trick.
If the conversion is to reduce USB to RS232 interface it seems a little stupid to go in reverse in terms of technological development? But as metioned for low speed and/or low bandwith applications this can be done,
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