[CentOS] Need to test serial port connection
William L. Maltby
CentOS4Bill at triad.rr.com
Thu Feb 26 20:41:14 UTC 2009
On Thu, 2009-02-26 at 14:29 -0600, Robert wrote:
> <snip>
> breakout box. Lacking one of those, you might find the statserial
> program to be of some use in figuring out what the control lines are doing.
> # yum --enablerepo=dag install statserial
> will install it. It has a short man page. Run with no options except
> device ( # statserial /dev/ttyS0 ) will cause it to loop, indicating
> status of all control signals. You can manually tweak any of the pins
> with direction of "in" with a 9-volt battery or by using a paper-clip
IIRC (very iffy) +/- 12 volts is needed.
> jumper from one of the "out" lines. It won't be long before you can
> identify the port, moving an "unknown" to "found".
There are pins designated to _provide_ the correct voltage full time (on
25 pin units - unsure about 9 pin). The google will get a specification
of which they are - I can't remember.
>
> Good luck!
> <snip>
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