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

I don't think it's an issue with the firmware serial receiver; I've used that same code for baud rates up to 250K and it works fine.  The will be a lot of electrical noise in a Christmas display, especially with triacs firing at any point in the AC cycle.  You could try to route your comms wiring away from AC and keep it as short as possible.  Are you using RS-485? This would seem to make the system more noise-immune.

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