At 08:51 AM 2/9/97 -0500, you wrote:
>I hav been trying to get reliable serial communications on a 16C57 for
>a while now, an almost have it working. The problem is that it doesnt
>seem to get the first 3 bytes ok, they are always the same relative to
>the data but wrong.
>
>Here is what I should receive:
>
> 36h 32h 30h 32h 30h 38h
> The rest is ok.
> This is what I get:
>
> 4dh 4ch 4ch 99h 98h 38h
>
>Can someone tell me whats wrong?
>
>Data rate is 2400 baud, Total bessage is 32 bytes, I only need the first
>16.
>
>--
>Alan Nickerson

You may have a slight problem in timing, especially in processing each byte
after it is received -- appears you may be missing a start bit or something.

If you write out the bit pattern of what the data should be, least
significant bit first from left to right on paper and insert a "10" between
the bytes for the stop/start bits, and then a similar bit pattern of what
data was received right below it, then you'll see that you are receiving
the data bits but out of frame sync.  (Whew! what a sentence!)  The
resultant data patterns will be skewed from each other.

What algorithm are you using?

Looks like you are *almost* there.  Good luck.

Don L. Jackson / Gilbert, Arizona
Azark Consulting Group