Brusque,

I have built both a DMX receiver and transmitter (both based on the 16C76
@ 20 MHz).  Information about the receiver is posted on my
homepage.  With regards to the transmitter, I haven't yet had a chance to
get the schematic in a presentable state.  Once I do, I will post
the transmitter project as well.

In order to make generating the break easier, I tied a resistor from the
output pin of the UART to ground.  When it became time to generate
the break, I disabled the transmitter part of the UART.  This places the
output pin of the UART in a high impedance state.  Since the resistor on
the
output pin is tied to ground, this caused the input of the RS485
transmitter to go low, thus generating the break.  When the break was
finished, the
UART transmitter was re-enabled, the start code sent, and the dimmer
values transmitted.  Then the whole process started over.

Kelly Kohls, N5TLE
Dallas, TX
Email:  kkohls@juno.com  OR  n5tle@qsl.net
Website:  http://www.qsl.net/n5tle/

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