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

Simple question: Do you have a common ground between the SXes?

Serial comms is always LSB first.  A "True" signal has the serial idle state high with the start and any "1" bits going low, an "Inverted" signal has the idle state low, with the start and "1" bits going high.  

There's no reason you shouldn't be able to make this work -- I have many projects that use a BASIC Stamp and the SX, and both are simply microcontrollers.  Perhaps if you post both programs (not just fragments) then something will be detected by one of us.

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