Sun serial port communication problem

[Tom Chmara]

quasar at ctt.bellcore.com (Laurence R. Brothers) writes:
>My test reader just does an open on /dev/ttyb and sits there busy-waiting,
>copying anything it reads to stdout. To write to ttya, I just either cat a
>file into the device, or open it for writing from a toy program.
>
>The problem is that my reader reads garbage....

Sounds like a problem I had at one point.  The problem turned out to be
that I hadn't turned off echo on the ports; each character was echoed by
the terminal driver, and was then looped back into the driver, which took
it as more input... (on top, of course, of the input I was already
squirting into the port, and output from any shell or application with
which I was communicating).  And you're right --- the garbage looks
"familiar", because what you'd really expected to say (and any output from
your input) IS in the text; it's just buried in gibberish...

Sorry about the delay in getting this out (and that it's a posted
message); our mail feed has been refusing to talk with us lately, and
though I think I have it working, I'm trying this means just in case...

	---tpc---

Tom Chmara			UUCP:  ..utgpu!bnr-vpa!bnr-fos!tpc
BNR Ltd.  			BITNET: TPC at BNR.CA