Is it acceptable to have A & B wire at same voltage in RS485
That does not seem correct to me, I've probed a commercial DMX output
  and basically, a 1 is like a 0 with A&amp;B signal swapped. Does the
  signal (2 &amp; 3) below, especially when 1 is high seem correct to you?


No that isn't correct - it looks like you are feeding the enable pin instead of the TX data line or, maybe you are feeding the TX data line but your enable line is floating.