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APC Smart UPS: USB or serial ???
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Veteran
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Joined: 27 Feb 2004
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PostPosted: Tue Mar 13, 2007 1:32 am    Post subject: APC Smart UPS: USB or serial ??? Reply with quote

I've bought the brand new APC Smart-UPS 750VA (SUA750I)

I've got both serial and USB cable to connect it to my computer. I'm going to use apcupsd to monitor/control the UPS - I had a really good experience with apcupsd with my old APC Back-UPS 500VA.

So, is there any difference in functionality/performance/reliability if I connect UPS via serial or USB cable?

:?:
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l33t
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Joined: 04 Oct 2006
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PostPosted: Tue Mar 13, 2007 2:07 am    Post subject: Re: APC Smart UPS: USB or serial ??? Reply with quote

not really, if you got a vacant serial port i say use that you can always use usb if you wish, either one is fine.
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timeBandit
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PostPosted: Tue Mar 13, 2007 3:57 am    Post subject: Reply with quote

There is a difference, sometimes. Some UPS models only provide "dumb signaling" mode over the serial port, even with an APC cable: no data on battery reserve, line voltage quality and all that good stuff, just simple state transitions (on battery, on A/C, shutting down, etc.). Performance and reliability aren't affected, only the monitoring functionality.

That's true of the Back-UPS line anyway, but the Smart-UPS units are ... smarter :) ... and might work 100% over the serial link. Try both and see.
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