I am way behind the curve on this. I have an S772 drive controller that I am trying to set up. We have had this drive sitting on a shelf for a long time. I have a laptop set up with Windows 7, an RS232 cable, but no serial port on the computer. I bought a serial port to USB converter cable and opened the USB in the manager to be used as a COM port (for use with serial cable). But when I connect the computer and the drive units together, I get a faulty parameter error message which essentially means the drive and the computer are not communicating properly.