Hello, I'm very interested in building a DMX project and found Kathys page here, I looked the code and circuit appears to be ok, but it is a bit hard to get a DMX controller to test the circuit by here, I have mounted the circuit just for the test, could give a try 3 months ago but no success, then I discovered the SN75176 wasnt passing the data trough because of CTL pin, also, dont know what P81 and P82 (maybe PS1 PS2) components are... somebody had success with this project already? Thanks!

Kathy DMX receiver:
http://www.8052.com/users/dmx512/recieve.phtml