Stdin / stdout through RS232

Even the venerable Procomm craps out on me a few times a day. May i
suggest an old vt100 from ebay? :D

>
> Personally, I'm surprised Microsoft included the piece of junk that is
> Hyperterminal in Windows; there were far better choices!  I also find it
> incredible that Hilgraeve had the audacity to stick an advertisement for 
> the
> full version of their product into it -- yeah, if the stripped-down 
> version
> works so poorly, I'd really want to risk using a full blown version!
>

I would have fully agreed an hour ago. However, today I was so frustrated 
about the broken scroll-buffer that I checked Hilgraeves homepage (did 
anyone other ever did that?): There is a free update ("personal edition") 
that at least fixes this bug... As I have downloaded it only about 10 
minutes ago I do not know about the other bugs, but it can't be worse then 
before...

BTW: In the XP-HyperTerm there is a note about (C) Microsoft, parts (c) by 
Hilgraeve, while the update (and I also believe the original Win 
95-HyperTerm) is only (c) Hilgraeve. So I get the feeling, that we were all 
partly blaming the wrong company for that piece of junk ;-)

Thomas 

> Before you spend too much time screwing around with Hyperterm or other
> serial programs, have you looked at the signals from your fpga board to
> the serial input of your computer? Start with no serial cable, and
> check that the TX pin (when no characters being sent) is -5V
> to -15V. The RX line should be floating close to 0V. Check the two pins
> that TX and RX connect to on the computer (pins 2 and 3 of serial port
> connector). The one that your FPGA TX is going to connect to should be
> an RX pin, and it should be close to 0V. The pin that the FPGA board's
> RX is going to connect to (computer TX) should be -5V to -15V.

With no serial cable fpga TX is -5V and RX is 0V.

With no serial cable pc RX is -15V and RX is 0V.

Is it fault?

Marco

Solved the trouble... sometimes, I'm so stupid... I don't have used a 
straight cable.

Now it works perfectly!

Many Thanks to Everyone!!!!
Marco 

On Thu, 25 Aug 2005 16:44:19 +0200, "Marco" <marcotoschi@nospam.it> wrote:
>> Before you spend too much time screwing around with Hyperterm or other
>> serial programs, have you looked at the signals from your fpga board to
>> the serial input of your computer? Start with no serial cable, and
>> check that the TX pin (when no characters being sent) is -5V
>> to -15V. The RX line should be floating close to 0V. Check the two pins
>> that TX and RX connect to on the computer (pins 2 and 3 of serial port
>> connector). The one that your FPGA TX is going to connect to should be
>> an RX pin, and it should be close to 0V. The pin that the FPGA board's
>> RX is going to connect to (computer TX) should be -5V to -15V.
>
>With no serial cable fpga TX is -5V and RX is 0V.
>
>With no serial cable pc RX is -15V and RX is 0V.
>
>Is it fault?

I can't tell. You listed RX twice, and no TX for the PC :-)
The levels you have for the FPGA board is exactly what I wrote
you should expect.

If the first one for the PC is really "RX" and the second is "TX", then
this is wrong. You have the wrong labels (which is what I guessed was
your problem). The PC signal with -15 is a TX pin, not an RX pin.

>Marco

Getting closer.
Philip
Philip Freidin
Fliptronics