26 Aug
2012
26 Aug
'12
11:48 p.m.
On Sun, 26 Aug 2012 23:56:11 -0400
Paul Anderson <wackyvorlon at me.com> wrote:
There's a certain breed of PIC microcontroller
programmer that relies
on 12v signals on RS232 to provide enough voltage to trigger the
programming.
The USB to serial chips I've seen so far are all 5v, thus they can't
power such programmers.
RS232 does not provide power. If you missuse it and draw
power from it
you have to be prepared for failure. RS232 is specified from 3..15 V
(5..15 V) thus 12 V is a false assumption anyway. So that PIC programmer
seems to be cheap shit that big-bangs signals. Perhaps time to get a
proper tool for that job? ;-)
There is one serious flaw I encountered with USB RS232 adapters:
They can't generate a serial break.
This may be a fault of the adapter hardware or a bug in the OS driver.
(OS is NetBSD.)
--
\end{Jochen}
\ref{http://www.unixag-kl.fh-kl.de/~jkunz/}