The model 4140 Optical Signal Processor (OSP) is the newest and most advanced of the OSP’s offered by TOMAR. Installed inside the traffic cabinet, the 4140 provides power for 209X Optical Detectors, receives, decodes and prioritizes signals from the detectors, logs preemption and priority control activity, communicates with other traffic control devices, and optically isolates the preemption channels.

The 4140 is delivered default programmed to respond on a first-come, first-served basis to optical signals from vehicles within two signal bands.  Emergency band signals are typically emitted  by  emergency  vehicles to effect a preemption of normal traffic control timing and are given the highest priority to allow rapid emergency response with enhanced safety.  Transit band signals are generally emitted by transit or other non-emergency municipal vehicles to effect a priority change for the vehicle’s approach direction without necessarily interrupting traffic control timing.  Up to 65,000 vehicles in each signal band can be individually identified.

Using a simple Windows-based configuration program, the user can define up to 16 additional classes within each signal band with different priorities, detection ranges, and choices of actions, from simple logging to full traffic preemption.

Equipped with an Ethernet port and the ability to classify and announce the presence of multiple vehicles in real-time, the 4140 makes an excellent intelligent vehicle sensor for ITS applications.

The 4140 OSP is compatible with NEMA TS-1, TS-2, and CA/NY 170, and 2070 controllers  and  meets  all  NEMA  and CalTrans environmental requirements.  The 4140 plugs directly into a 170 input file without any additional hardware and does not use the internal 24VDC cabinet power.  For NEMA cabinets without prewired preemption slots, the TOMAR model 1881 rack provides the necessary hardware and harnessing to allow simple connection to detector outputs and controller inputs.


Plug-and-Play Firmware allows the ability to add accessories in the field without manual configuration.  This allows you to buy only what is needed today and add more capability later, saving precious funds.

Active Reflection Suppression prevents cross street preemption due to reflected emitter technology.  Only TOMAR’s advanced, digital signal processing can eliminate this troublesome side effect making system installation and setup far less critical.

Expansion Port provides easy connection of the 4140 to other accessory modules like green phase monitors, confirmation light drivers, and external preemption adapters for controllers that do not have internal preemption software.

  • 65,000 vehicles per band and over 14,000 log records standard
  • Built-in Ethernet port providing a full-featured TCP/IP stack, with enterprise grade security features, for configuration, diagnostics, and log information
  • Firmware upgradable remotely via Ethernet port for simple future feature additions
  • Fully supports OSPsoft and OSPtrack3 software via Ethernet
  • Universal AC input voltage
  • Enhanced transient/lightning protection
  • Short-circuit proof detector power
  • Simplified front panel interface