Optical Equipment

RF/Optical Priority Detector

The ST-9365 Priority Detector is a dual-card, two or four channel universal phase selector to be used for encoded or non-encoded optical priority requests from all major brands of optical emitters, as well as EMTRAC 900 MHz FHSS radio.

EMTRAC Universal Phase Selector - Dual RF/Optical Priority Detector

ST-9365  -  Dual RF/Optical

The Priority Detector responds to frequencies from all major optical emitter brands, and it recognizes the frequency rates of requesting vehicles to differentiate their priority levels. The Priority Detector is capable of receiving both optical and RF requests and prioritizing them by priority level and class of vehicle.

The Priority Detector is compatible with NEMA, 170/2070, Caltrans, ITS, and custom cabinets. It can be installed directly into the input file of Type 170 controller cabinets or may be provided with a Priority Detector Case (ST-9194) for NEMA cabinets (when input-file space is not available).

  • Detects and calls up to four optical channels while simultaneously detecting EMTRAC RF requests
  • Records both optical and RF activity, logging each event by request type
  • Logs up to 5,000 locally-stored events (up to 10,000 events with removable memory)
  • Signal-phase monitoring and priority-request confirmation
  • Standby/Active switch enables testing and configuration without affecting the live signal
  • Multiple vehicle priority levels (to accommodate both EVP and TSP)
  • Compatible with all major brands of NEMA and 170/2070 controllers
  • Optically-isolated outputs (and auxiliary inputs)
  • Time to Hold Request After Loss of Signal
  • Max. Request Time/Min. Request Times (by channel)
  • Priority Service Control (define how simultaneous priority requests are served)
  • Communications Baud Rate
  • Configurable Output Channels (by direction)
  • Activity Log Display of Most Recent Events
  • Vehicle Allowance or Denial (by vehicle ID)
  • Optical Signal-Range Thresholds by Direction: Range up to 2,500 feet (3,000 feet in optimal conditions)
  • Audible Indicator (on Priority Detector): On or Off
Two & Four-Channel Optical Priority Detectors

The ST-9320 and ST-9340 Priority Detectors are single-card, two and four-channel devices to be used for encoded or non-encoded optical priority requests from optical emitters.

EMTRAC Two and Four-Channel Optical Priority Detectors

ST-9340 (4-channel) and ST-9320 (2-channel)

The Priority Detectors respond to frequencies from all major optical emitter brands, and recognize the frequency rates of requesting vehicles to differentiate their levels of priority. The Priority Detectors are capable of prioritizing simultaneous signal requests by priority level and class of vehicle.

The Priority Detectors can be installed directly into the input file of Type 170 controller cabinets or may be provided with a Priority Detector Case for NEMA cabinets (when input-file space is not available).

The ST-9320 and ST-9340 Priority Detectors are equipped with robust onboard memory and are capable of storing up to 5,000 detailed activity logs, which include Intersection ID, Vehicle ID*, Vehicle Class*, Vehicle Priority Level, Directional Code, Priority-Request Duration, Controller Confirmation (optional), and Request Start/Stop Date and Time.

*Vehicle ID and Class must be provided by emitting system.

  • Detects & calls up to four optical channels from all major brands of optical emitters.
  • Records vehicle-request activity, logging each event by request type
  • Logs up to 5,000 locally-stored events
  • Capable of monitoring and logging signal-phase states as well as priority-request confirmations
  • Standby/Active switch enables testing and configuration without affecting the live signal
  • Receives two-channel (ST-9320) and four-channel (ST-9340) ranging probe frequencies
  • Multiple vehicle priority levels (to accommodate both EVP and TSP)
  • Compatible with all major brands of NEMA and 170/2070 controllers
  • Optically-isolated outputs (and auxiliary inputs)
  • Time to Hold Request After Loss of Signal
  • Max. Request Time/Min. Request Times (by channel)
  • Priority Service Control (define how simultaneous priority requests are served)
  • Allow/Deny signal priority by Vehicle ID
  • Configurable Output Channels (by direction)
  • Vehicle Allowance or Denial (by vehicle ID)
  • Optical Signal-Range Thresholds by Direction: Range up to 2,500 feet (3,000 feet in optimal conditions)
  • Activity Log Display of Most Recent Events
Optical Sensors

The EMTRAC Optical Sensor detects optical strobe signals from vehicle-mounted emitters and outputs the interpreted signals to the cabinet-mounted EMTRAC Priority Detector.

EMTRAC Optical Sensors for Emergency Vehicle Preemption and Transit Vehicle Priority

Optical Sensors (1 dir, 2 dir, 2 dir/2ch)

EMTRAC Optical Sensors detect optical pulses from both EMTRAC and non-EMTRAC vehicle emitters. The Optical Sensor is fully compliant with NEMA TS2 standards and is encapsulated in a rigid weatherproof enclosure and is supplied with all hardware and sealing gaskets.

The Optical Sensor may be mounted on mast arms, span wire, or other appropriate structure with a direct, line-of-sight view of the intersection approach.

The EMTRAC Optical System is the preferred method for signal-priority control for agencies looking to update existing optical systems, while adding the ability to detect multiple types of legacy emitters.

For more detailed specifications, refer to the Optical Sensors cut sheet (PDF).