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The Modular Signal System has been standardized to ensure
commercial products are developed to successfully inter-operate.

Only products that comply to applicable sections of
the MSS Standard are considered MSS compatible.

The MSS Standard V2.0 was released in October 2015 by the
MSS Standards Working Group and is available here in PDF form.
Modular Signal System
Standard V2.0.2
Note: The V2.0 Standard supercedes Gregg Fuhriman's magazine article in
the February 2005 Rail Model Journal (page 8), considered "MSS V1.0".
Modular Signal System - MSS