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ADD MSS (Modular Signal System) and

Animate your Layout or Free-mo Module with Prototypical Signals.

Our components (Signal Driver , Detector, Crossover Breakout, Straight Break Out, and Cascade boards) are the smart and easy way to add MSS 2.0 signal animation to a new, existing lay out or free-mo module.

Scale Signal System Products

Scale Signal Systems Optek Detector v3.0

Provides the Optical Detection function described in the MSS specification. It uses advanced digital sampling to enhance the detection capabilities of the OPB-704WZ optical sensor. The module can also be used to provide release delay capabilities for current detection products  without release delay capabilities. The optical and current detection outputs are combined into two buffered outputs.  Sensitivity adjustment added to remove IR flooding issue. 
Supports 1 OPB-704WZ optical sensor. Can be configured with 0.1" headers rather than terminal blocks for use with .1” (2.54mm ) Female to Female Connector Cables. Please specify at time of order. Optical sensor not included.  Not offered as a kit.

Assembled and Tested  $40

Scale Signal Systems DAPD Detector v3.1 

Provides the Optical Detection function described in the
MSS specification.
Uses available light to detect train position. Based on a Geoff Bunza design. Comes with 2 PT19 photo transistors. One mounted on a HO circuit board tie and the other on a 1/4" circular circuit board or 2 1/4" circular circuit boards. Also a available as a 2 track 3 sensor board. Board can be configured with 0.1" headers rather than terminal blocks for use with .1” (2.54mm ) Female to Female Connector Cables. Please specify at time of order. Not offered as a kit.

• Single Track Assembled and Tested $45.
• Double Track Assembled and Tested $60. 

Scale Signal Systems Signal Driver v2.0 Dual Head

Provides the signal driver function for 2 signal heads as described in the MSS specification.
Requires clean 12 volt DC input. Drives lamps/LEDs at 5v. Direct output to servo can accomdated. RJ 12 connectors can be replaced with terminal blocks. This board can be configured with 0.1" headers rather than terminal blocks for use with Dupont Wire Female to Female Connector Cables 2.54mm 1P-1P. Please specify at time of order.
Also offered as a single head board. Not offered as a kit.

• Dual Head Assembled and Tested $60
• Single Head Assembled and Tested $35 

Scale Signal Systems Signal Terminator v1.0

Provides Plug and play termination for Signal Driver board
Has series resistors for Lamps / LEDs. Resistor value can be easily changed to accommodate input voltage.
Allows for easy removal of signal for travel or troubleshooting. RJ 12 connectors can be replaced with terminal blocks.
This board can be configured with 0.1" headers rather than terminal blocks for use with Dupont Wire Female to Female Connector Cables 2.54mm 1P-1P. Please specify at time of order.

• Kit price $8.00 Assembled and Tested Add $3 

Scale Signal Systems Straight Breakout v1.0

Provides a pass-through function for easy hookup of the MSS bus.
Provides a breakout for simple connection of a current detector.
This board can be configured with 0.1" headers rather than terminal blocks for use with Dupont Wire Female to Female Connector Cables 2.54mm 1P-1P. Please specify at time of order.

• Kit price $6.50 Assembled and Tested Add $4 

Scale Signals Systems Crossover Breakout v1.0

Provides a crossover module function described in the MSS specification. Provides a breakout for simple connection of a current detector.
This board can be configured with 0.1" headers rather than terminal blocks for use with Dupont Wire Female to Female Connector Cables 2.54mm 1P-1P. Please specify at time of order.

• Kit price $6.50 Assembled and Tested Add $4



Scale Signal Systems Cascade v3.0

Performs the cascade module function described in the MSS specification.
Supports Approach Diverging Function.
This board can be configured with 0.1" headers rather than terminal blocks for use with Dupont Wire Female to Female Connector Cables 2.54mm 1P-1P. Can also be ordered with right angle or straight headers for direct connection to Scale Signal Systems signal drivers and optical detectors. Please specify at time of order.

• Kit price $15.00 Assembled and Tested Add $8

Scale Signal Systems Signal Plug

Designed to make removal, installation, and protection of expensive signals easy. Insures that signals are flush with scenery. Combination of electronic components and laser cut wood. Top of plug is epoxied to the bottom of the signal. Signal connections from head(s) are soldered to an 8-pin connector. Socket is installed in lowest ring and entire assembly is glued into a 1" diameter hole in the lay out surface. Push rod is used to push signal out when module is transported. Signals and signal terminator not included.

Kit price $25. Assembled, installed, and tested on your signal add $10 

Scale Signal Systems Signal Driver v2.2TH. 

This driver provides the signal function for up to 4 signal heads as described in the MSS specifrication and drives lamps or LED's with 12 volts to support older signas. Supports full function for 2 heads( 3 colors), second head for approach diverging (1 color). Limited Availability. Contact us for more information and pricing on this product.

Scale Signal Systems supports open standards. This includes open specifications like MSS and OpenLCB.


All of our hardware designs are open source and are licensed under the Creative Commons Attribution-ShareAlike license


In addition all of our software is also open source and licensed under GNU General Public License, version 3 (GPL-3.0)

WARNING: These products contain chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.