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

After much experimenting I found this is the most reliable way to transmit serial data through an HO scale railroad track.

Transmitter Code: ******************************

tris_a = 0
_data var byte

DO

SEROUT RA.0, T2400, _data

pauseus 100

LOOP

Receiver Code:     ******************************

tris_b = 0
plp_a = 0

DO

SERIN RA.0, T2400, rb

LOOP

The only problem with the serout command is that it does not generate bipolar AC from my H Bridge.  Only inverting a pin does that (the only way I know of).  So the transmitter would need to transmit serial data at 2400 baud doing (ra.0 = ~ra.0) bitwise nots.  I do not know how to calculate the pauses needed to send a binary 1 or 0 or have an accurate idea how to code a bitwise not serialout program.  Also if there is a way (even using serout) besides bitwise not that can generate bipolar AC please say so.

Thank you

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