[Nut-upsuser] Best Fortress LI660VA-Question(s)

Charles Lepple clepple at gmail.com
Tue Aug 30 13:11:15 UTC 2005

On 8/30/05, Ralf Folkerts <ralf.folkerts at gmx.de> wrote:
> However, no comms is possible with the UPS. I sent dozenz of "<cr>" and
> also "Q"<cr> but without getting any Reply from the UPS.

Did you turn off hardware and software flow control?

Also, what baud rate did you try? 1200 is common for UPSes.

> However, when I
> switch the UPS off I get <strange Character>{0001}. I first thought this
> was by accident, but it's repeatable.

Many serial devices will do this when you power them down. I'm not
sure that this is an attempt at communication.

> Now, does anyone here have a hint for the Comms? It seems my Cable is
> not 100% OK -- but how must it look like?

not sure about this, but you might want to use a multimeter to probe
around and make sure that the pin connected to TX on the PC is
somewhere near ground, and the pin connected to RX is at least 3V
above or below ground (I always get mark and space polarity mixed up,
but it should not be at ground).

- Charles Lepple

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