The Devantech USB-ISS board looks really useful, but it’s not clear how to talk to it. The commands to set up, send data, receive data and analog are all clear, but if the device appears as a COM port to the PC, what data rate does it use?
Manual / reference material:
It sounds like your first step is to download the driver:
http://www.robot-electronics.co.uk/files/usb-devtech-inf.zip
The procedure they describe is pretty step by step from then on.
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