not without taking off the db25 cable.
estop works but the switch does not in the same pin.

I am sorry I dont know why it worked before but not now but seems like the BOB is not passing the signal, it seems to be pulling the voltage down.
If the PP cable had a screwed cover you could connect direct to a pin on it but if its a molded cover then only way would be to chop into the cable.
Atill why it used to work and now doesnt is a mystery.
Hood

I found my old db25 pass through breakout board and it still does not work.

the blue wire read .05v when hooked up to the db25 breakout board?
this might be the dumbest thing I have ever run across.

What does the 5v supply read when you have the opto connected? ie between the 5V and Gnd, both when switch is open and blocked.
Hood

well, I got it!
I hooked up my pass through break out board up to the second parallel port and now the stupid ass thing works like it should.
why the first port sucks is a mystery to me.
I might put my other couple inputs on the secod board for the hell of it too.

thanks for the help!!!!!!!!!!!!

Good you have progress
Hood

2 days lost to this.....