The SimpleSig MSS to Atlas Signal System Adapter is designed to allow users of the Atlas All Scales Signal System to bridge to standard Modular Signal System (MSS) modules. This gives users the capability of extending their signals using a variety of vendors' MSS modules without needing to tear out and replace their existing investment in Atlas boards. It's not really intended for modular users, but rather focused at home layouts that already have an Atlas system in place.

MSS provides a number of advantages over the Atlas system:

• As an open standard, interoperable modules are available from a variety of different vendors, or you can build your own to the specification
• MSS only requires one cable and one set of modules to handle bi-directional signaling, rather than separate modules and separate wiring for each direction
• MSS detects the whole train even without resistor-equipped axles by using a combination of optical and current detection

Features

• Combines two directional Atlas All Scales Signal System buses into a single bidirectional MSS-compatible connection
• Preserves your existing investment in the Atlas system
  
• Powered from 8V to 24V DC, AC, or DCC power.
• Compatible with Modular Signaling System standards 1.x, 2.x, and (proposed) 3.x
• Onboard diagnostic LEDs help debug problems between the two systems
• Robust, protected bus interfaces assure reliable operation

Specifications

Size: 2.75"(L) x 2.5"(W) x 0.5"(H)
Power: 5 to 24 volts DC, AC, or DCC at 30mA (typical)
MSS Standard Compatibility: 1.x, 2.x, and (proposed) 3.x

Documents

The complete Kicad design files are available on GitHub.

User Manual

Schematic (v1.1)