We have custom firmware for the 485 communication on our product. It uses the RTS line as a write enable and the CTS line as a loop back of the RTS. We were sold this PXI-8433/4 with the sales rep indicating that this product could do this. I am looking for a programming example of how to setup a port to read/write (set high/low) for a given port when i send a message over the line. Anyone have any idea / direction / help?