[Nut-upsuser] Contact-closure UPS

Charles Lepple clepple at gmail.com
Fri Dec 18 02:57:45 UTC 2015

On Dec 17, 2015, at 4:51 PM, Róbert SZAKSZ <robert at szaksz.eu> wrote:
> Which output PIN on PC side is during whole communication on drivers blazer_ser or nutdrv_qx stable on Logical 0 (+12V)?
> I want make small power source with one resistor (1k) and 3V zenner diode and put on UPS Pin1.  

I always forget which signals are inverted, but for upsdrv_qx: "By default the driver will set DTR and clear RTS..."

You can adjust this if needed:


Charles Lepple
clepple at gmail

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