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'[PIC]: RS232 voltage'
2002\01\01@190805 by Tal Bejerano - AMC

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Hi 2 all

I'm checking on my computer a ups shutdown software.
now, when I'm shorting the com port pins 4&5 the software begin to
countdown. after the countdown finished, the software shut down windows and
run the dosstart.bat in windows directory. in dosstart.bat there is a
utility that signal the ups (from comport pins 6&7) to self shutdown.
I measure the voltage on pins 6&7 without load and find that the voltage is
26V !! how come?
Does anyone knows why the voltage so high? I thought it's should be +-12v,
isn't it?

Tal

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2002\01\01@194822 by Dale Botkin

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Tal Bejerano - AMC <.....kooterKILLspamspam@spam@ZAHAV.NET.IL> said:

> I measure the voltage on pins 6&7 without load and find that the voltage is
> 26V !! how come?
> Does anyone knows why the voltage so high? I thought it's should be +-12v,
> isn't it?

Not always...  spec says, if I recall correctly, 3 to 30V from ground,
positive or negative.  So unloaded it could be as much as +-30V on 6 & 7,
assuming a DB25 connector where pin 7 is signal ground.  On a DB9 connector
it could theoretically be as much as 60V difference, since you're looking at
signals that could be at opposite ends of the range.

Dale

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