> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of David Duffy (AVD)
> Sent: 12 June 2009 07:47
> To: Microcontroller discussion list - Public.
> Subject: [EE] USB to contact closure
> 
> I have an application where a PC needs to trigger another device via a
> contact closure. The current PCs have serial, parallel and USB ports
> available, but in future one may only have USB.
> 
> My first thought was an FT232 USB-serial chip and a small micro
driving
> a reed relay, but I'm trying to simplify the design and get the cost
> down as there's potentially 1000 or so units to deploy.

You could get away with just the FT232 device, controlling the handshake
lines and TX line state is quite simple through Windows (and I assume
Linux).

Regards

Mike

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