On 11/15/2019 3:12 AM, Brent Hilpert via cctalk wrote:
On 2019-Nov-14, at 10:23 PM, Jim Brain via cctalk wrote:
If you look at the values received by an 8N1 connection from a sender using the
different settings, you get:
AT
at
At
aT
7E1
E174
41D4
E1D4
4174
7O1
61F4
C154
6154
C1F4
7M1
E1F4
C1D4
E1D4
C1F4
7S1
6174
4154
6154
4174
8N1
6174
4154
6154
4174
Obviously, still trying to find the magic boolean logic equation to tease out
the parity, but you could brute force it with these values and only aT would
cause you issues requiring looking at CR (7E1 would send 8d, while 7S1/8N1
would send 0d.
(If it is of any consequence at this point)
If those vertical groups of 4 are intended to correspond to the first group of
AT/at/At/aT, then you have the case bit (0x20) inverted, uppercase are bit 0x20
OFF (lower value), lower case are 0x20 ON (higher value).
Well, the above values are what an 8N1 connections sees when the other
end is set to the various 7 bit parms. I verified that the numbers
above are correct, case and all.
Let me peruse the code you sent. I did some eoring, but maybe your math
works as well. First, it looks like I need to replicate the behavior os
the at prompt (it looks to be calculated as soon as the T is received).
Jim
--
Jim Brain
br...@jbrain.com
www.jbrain.com
