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TWO CHANNEL DMX REPEATER/LINE DRIVER (Zipfile:19Kb)
Unzips after downloading to WORD97 format
This Word file contains full schematic and circuit description of a DMX repeater/line driver which outputs the DMX into two channels with full 32 unit drive capacity.
RS-485 Writeup (pdf file:100Kb)
Read using Adobe Acrobat
This is a pretty good write up on the RS-485 physicals by National Semiconductors. Worth reading !!