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

All EFX-TEK accessories (e.g., AP-8, DC-16, FC-4, and RC-4) use an SX with open-true communications and the Parallax AppMod protocol.  As Robert points out, though, the modules are designed for very short interconnections.  With straight TTL there is virtually no noise immunity.

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