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USB is a high speed serial protocol. It uses lots of handshaking between the device and the host to determine what the device is. I'm actually currently working on a USB embedded project for work and it's not a simple system, it has a lot going on.
If you got yourself a USB to serial port converter you could write a program in say VB to toggle the RTS which you could stick onto your relay.
Or if you are more adventurous then you could program up an Arduino or similar to receive RS232 and toggle any number of I/O.
Last edited by kustard; 05-02-2010 at 01:07 PM.
Reason: Speeeling
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