You can find several interesting links to DMX-512 projects (both directions) at
http://www.epanorama.net/links/lights.html#dmx512
Specific link recommendation to check from that page is http://www.qsl.net/n5tle/ "Kelly Kohls, N5TLE Homepage". You can find there PIC16F876 DMX512 to Analog Voltage Converter Schematic and PIC16F876 Analog Voltage to DMX512 Converter Schematic.
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