Paolo, to my knowledge there is no capability within  Rev of communicating with 
a USB port, although I think Chuck had been working on something along time 
ago.I've been wanting to use a Rev project as an interface to the aircraft 
simulators we build and have been working on getting Rev on OS X to talk to a 
PLC for some time now, unfortunately with limited success.  As mentioned in 
other posts, Rev communicates quite well with serial ports, but alas they don't 
come on Apple platforms.  I've been using an IOGear USB to Serial adapter, but 
for some reason the system seems unstable.  The last time I tried it I kept 
getting what appeared to be a bit shifting on the response from the PLC and got 
so frustrated I gave up.I've been using an EZ-PLC which is very economical, but 
the support for low level serial port communication is almost non existent.  
I've recently discovered the Arduino (which was invented in your part of the 
world) and am now considering communicating with that via ethernet.If anybody 
has more to add on this subject I'd be extremely happy to hear about it !!best, 
Bob...
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