Sensys Access Point Controller Card (APCC)One of the newest hardware additions to its VDS240 wireless vehicle detection universal platform


Sensys: Access Point Controller Card (APCC)

The APCC combines the “brains” of the Access Point with contact closure card functionality in the cabinet. Able to integrate with up to two digital radios (SPP), the APCC doubles sensor coverage, reduces hardware usage and enhances communications, backhaul and data storage capabilities. The APCC system provides enhanced flexibility for all detection applications and is well suited for large and complex intersections.

  • Radio communications
  • Sensor data relay and processing
  • Data relay and storage
  • Master timebase for all supported wireless sensors
  • Radio signal quality measurement
  • Firmware upgrades
  • Easy installation
  • Low power
  • No calibration or adjustments needed


Access Point Controller Card (APCC)

The Sensys Networks Access Point Controller Card (APCC) is a second generation controller card that maintains low power consumption, supports multiple radios and allows for additional communication and processing power. The APCC, which is compatible with all of Sensys Networks VDS240 Wireless Vehicle Detection System products, receives and processes data from the sensors. The APCC then relays the sensor detection data to a roadside traffic controller or remote server traffic management system.

SPP Radio

The SPP is a low powered radio that maintains two-way wireless links to an installation's sensors and repeaters. The SPP establishes overall time synchronization, transmits configuration commands and message acknowledgements and receives and processes data from the sensors. The SPP then uses wireless connections to relay the sensor detection data to the APCC.


An isolator isolates and routes power from the APCC to the SPP and provides up to 2000 cable feet of communication for the APCC to and from the SPP at RS422 capabilities.

The minimum APCC system consists of an APCC, one SPP radio and a isolator. The system can also consist of two SPP radios with an isolator for each SPP radio that offers electrical isolation up to 150oV, surge protection up to 15ooV and AC power cross protection.

Types of APCC configurations

The APCC single-slot configuration consists of dual SPP radio ports, Sensys Networks expansion (EI) port and contact closure interface via backplane to a traffic controller. It also has dual USB 2.0 full speed host ports and io/iooBase-T network access. The APCC dual¬slot configuration adds an SD memory card, real-time battery-backed clock, optional dual serial (DB9) interface* and an optional second serial port or built in cellular modem.

* Full handshake control - COMM1 only