The very last thing you should have done is create an inf file with the wizard. Remove it and the compiled version completely. What you want to do is use the inf file that came with the device that made it a serial port to the OS and made it useable with Hyperterminal. It should appear in MAX as a serial port. Once you have restored everything the way it was, then you can start with the serial examples and writing to it should work like it did in Hyperterminal. In other words, you just have to send the correct AT command strings.
