2009/1/16 Eric S. Raymond <[email protected]> > Arjen de Korte <[email protected] <nut%[email protected]>>: > > Also note that the requirement for an IP stack makes this far more > > complex than what you need for a USB interface. So while the hardware > > for the interface may be cheap, it places much higher demands on the > > microcontroller (and firmware) to actually use it. > > Indeed. I concluded during my last serious look at this market in 2005 > that Ethernet is way overkill for this class of device, RS232C should > be shot through the head because it can't autoconfigure, and USB is an > almost perfect functional match for what UPSes need to do. >
the holy grail for UPS manufacturer is PLC ( http://en.wikipedia.org/wiki/Power_line_communication) but to be useful and perfect in this area, that would requires each system's power supply to embed PLC! Arnaud
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