Baud Rate on older wall mount controllers

[descipher]

I am trouble shooting a motion detector based wall mount controller where the commands are not read from it, I put it on the scope, looks like the baud rate is not 9600, may be 4800 based on the signal flank width (need to verify it), could do auto baud or do a fixed baud discovery test to use on incoming RX when those errors start. Thoughts?

Note: Current RATGDO also has this issue, it did work on the secplus v2 only firmware, so the secplus v1 feature timing changes may have broken it. RATGDO used auto baud on Arduino with the v2 only code, possibly to detect the baud in these cases.