VISA has all of the tools you need to send and receive data over the serial port. If you know all of the commands and the data format, then yes, you should be able to create your own driver. If the vendor has provided a driver in the form of a DLL or ActiveX control, then you could perhaps use that instead but you would still need some documentation on any provided software. I went to the Polhemus web site and didn't see any information on software but if they did provide some sort of driver, could you explain what you've got in detail?
