In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Lightfoot wrote:

How do you program an SX to transmit the bitstream in the attached picture (taken from this ?  [url]http://www.nmra.org/standards/DCC/standards_rps/S-92-2004-07.pdf[/url] pdf).  I used this code to experiment and connect the RA.0 pin to an h bridge:

DO

ra.0 = ~ra.0          
pauseus 58               'Pause duration

LOOP 

It gives me the bipolar AC necessary but you cannot do anything with it.  The digital command decoder interprets a logic level high as two pulses.  The first pulse is a 58us -14 volt pause.  The second is a +14 volt pulse at the same duration.  A logic level low is read as a 100us -14 volt pause and then a +14 volt pause.

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