Nut upsuser - Oct 2006 - Re: unisys UPS using RD, genericups does not

Hello, ahgu
>I have a unisys UPS, I probed the RS232 and notice that pin 2,
>(receive data) is going from -6v (OL) to 12v(OB), but I don't see the
>setting for the genericups. Seems nobody else is using the RD pin?
>Any driver I can use?
>Thanks
>-Andrew
Try RX as signal name (not RD).

-- 
Best regards,
 Sergiy                          mailto:rendol@mail.zp.ua

On 10/14/06, Sergiy Kazakov <rendol@mail.zp.ua>
wrote:
> Hello, ahgu
> >I have a unisys UPS, I probed the RS232 and notice that pin 2,
> >(receive data) is going from -6v (OL) to 12v(OB), but I don't see
the
> >setting for the genericups. Seems nobody else is using the RD pin?
>
> >Any driver I can use?
>
> >Thanks
> >-Andrew
> Try RX as signal name (not RD).
I don't think that you can easily read the level of the RX pin, and
even if you could, you would need to change the code:

   http://boxster.ghz.cc/projects/nut/browser/trunk/drivers/genericups.c#L58

Note that the valid inputs are CTS, DCD and RNG.

You can detect a "break" condition on the RX input, but the code to
determine when the pin changed from break to idle would be tough to
debug, and probably very system-dependent.

-- 
- Charles Lepple