Hi Kathy,

Looking through what you're seeing I think you have left the default Flow
Control to "Hardware".

"Disconnect" Hyperterminal (it comes up as "Connect" as a matter of course),
click on "Properties" and then select the "Connect To" tab and click on
"Configure".  In the new dialog box that comes up, select "None" for "Flow
Control".

I think you'll find that by default, "Flow Control" is set to "Hardware".

One trick that I always use when setting up RS-232 connections is to short
"DSR" to "DTR" and "RTS" to "CTS".  This will "fool" the hardware flow
control into recognizing that the other device is fat, dumb and ready to
communicate.

Good luck!

myke
----- Original Message -----
From: "Kathy Quinlan" <katinka@MAGESTOWER.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, December 28, 2001 9:40 AM
Subject: Strange errors with max232 chip


> Hi all :o)
>
> Now before anyone says this is not possible, I am off the morphine, I
slept
> last night, I had regular breaks from the computer, and I can not drink
> alcohol after having my gall bladder removed, but this happened and I saw
> it, and if someone wants I can post the MAX 232 chip to them so they can
> vouch for this fault ;o) (if I do not turn it in to a pet first ;o)
>
>
> Ok I have an AVR 8515 (but any Uc will do this) I connected it up as per
the
> destruction manual (correctly as a new chip fixed the fault) my program is
> set to receive a byte, and then dump one out back to the PC. nothing
> happened under hyperterm, but using term95 (from my beloved Norton's
> commander) in hex mode I found that with every byte I sent, the result was
> above normal 7 bit hex (infact shifted one bit to the left (^2)) and a
byte
> of 00h followed it.
>
> Now correct me if I am wrong the MAX 232 only level shifts and inverts
(plus
> generates the + - 10V) so how can it do this ??
>
> Yes I did remove the AVR and short the TX and RX ttl lines and same
problem
> so it has to be the MAX 232 (it is built on strip board but the tracks and
> jumpers are less than 2")
>
> Any ideas ???
>
> Also anyone know a good hex terminal for win 2k as hyperterm is giving me
> the S$%TS
>
> Regards,
>
> Kat.
>
>
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