<br><br><div class="gmail_quote">2009/1/16 Eric S. Raymond <span dir="ltr"><<a href="mailto:esr@thyrsus.com">esr@thyrsus.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Arjen de Korte <<a href="mailto:nut%2Bdevel@de-korte.org">nut+devel@de-korte.org</a>>:<br>
<div class="Ih2E3d">> Also note that the requirement for an IP stack makes this far more<br>
> complex than what you need for a USB interface. So while the hardware<br>
> for the interface may be cheap, it places much higher demands on the<br>
> microcontroller (and firmware) to actually use it.<br>
<br>
</div>Indeed. I concluded during my last serious look at this market in 2005<br>
that Ethernet is way overkill for this class of device, RS232C should<br>
be shot through the head because it can't autoconfigure, and USB is an<br>
almost perfect functional match for what UPSes need to do.<br></blockquote><div><br>the holy grail for UPS manufacturer is PLC (<a href="http://en.wikipedia.org/wiki/Power_line_communication">http://en.wikipedia.org/wiki/Power_line_communication</a>)<br>
but to be useful and perfect in this area, that would requires each system's power supply to embed PLC!<br></div></div><br>Arnaud<br>