On Dec 17, 2015, at 4:51 PM, Róbert SZAKSZ <[email protected]> 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:

http://www.networkupstools.org/docs/man/nutdrv_qx.html#_serial_interface_only

-- 
Charles Lepple
clepple@gmail




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