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This circuit will allow you to connect an RS232 device to a PC USB port, you can also omit the MAX232 IC and connect the USBMOD3 module directly to an MCu.
the USBMOD3 is a second generation, low-cost integrated module
for transferring serial data over USB. Based on the FTDI FT232BM USB UART IC, the
USBMOD3 is capable of transfer rates of up to 1000k baud (RS232) and 3000k baud
(RS422 / RS485).