As a debugger for the Modular Signal System, the MSS-DEBUG monitors signals on the occupancy bus as well as sends occupancy signals to test installations.  It's useful for bench testing signal installations on a module when no larger MSS network is available, or for figuring out why an MSS installation isn't working correctly.  The MSS-DEBUG requires 3x AAA batteries to provide operating power and includes a 1' straight-through ethernet cable for attaching it to an adjacent MSS node.

Features

• Diagnostic LEDs indicate status of MSS signal lines:
• Local Block Occupancy
• Approach Occupancy In (to node)
• Advance Approach Occupancy In (to node)
• Advance Occupancy Out (from node)
• Advance Approach Occupancy Out (from node)
• Diverging Approach In/Out (to/from node)
• Switches for toggling each signal line to test module response
• 12V bus pull-up voltage for testing bus segments without pull-ups (e.g. MSS-CROSSOVER module)
• Compliant with the Modular Signal System 2.0.1 standard
  
• Powered from 3x AAA batteries
  

Specifications

3.25"(L) x 1.9"(W)

Many thanks to Gregg Fuhriman and other contributors for the development and release of the Modular Signal System specification.

Documents

The complete gEDA design files are available on GitHub.

User Manual

Schematic