APC System

Up to APC Features Page Passenger Counting Unit Bus Interface Unit Infrared Transceivers PCU Accesories Bus Installation Kit Location Options Warranty Specs

System Components Passenger Counting Unit (PCU)  Bus Interface Unit (BIU)  Treadle Switches  Bus Installation Kit (BIK). The BIK is usually customized for the vehicle installation. A generic BIK is available for trial or small quantity installations. Typical APC options include a Signpost Receiver (SPR) for determining vehicle location, and Infrared Transceivers (IRTs) for garage wayside auto-offload. APC Block Diagram

 

	In addition to the PMT hardware, PMT also works with Wardrop Engineering, Inc. (Mississauga, Ontario, Canada) to supply turnkey systems that include garage wayside equipment, central office equipment, and data analysis software. The Passenger Counting Unit continuously monitors the state of the vehicle by checking the status of various input signals. Treadle Switches in the doorway stepwells are used to determine passenger flow. Door switches and the vehicle odometer signal are used to identify stops. All inputs, except the Treadle Switches, are first processed by the Bus Interface Unit for EMI filtering, transient protection, and conditioning for use use by the PCU.  The PCU interprets the stepping patterns of passengers by monitoring the closing and opening of the treadle switch elements and applying a proprietary finite state algorithm.
Back to Top	Vehicle Location Options PMT's standard vehicle location option uses 49 MHz RF signpost transmitters located at strategic points along the transit routes. The transmitters feature long-life lithium batteries, and broadcast unique codes for each transmitter. The codes contain a checksum byte for reliable reception. A microprocessor controlled Signpost Receiver is mounted on the vehicle, and communicates with the PCU over an RS-422 serial interface.  Other vehicle location options:  Signpost receivers compatible with existing Signpost Transmitter systems, such as Motorola 153 MHz equipment.  Optical signpost transmitters and receivers. GPS or DGPS receivers, with or without dead reckoning interpolation. Contact PMT for details. Maintenance Tools Detailed Technical Manual and Schematics  Information Display Unit - test set for APC maintenance and backup data retrieval
Back to Top	Warranty Two years for hardware products returned to factory  90 days for software products  On-site service contracts available  Technical Support Technical training available  Technical support is available by phone and fax during regular business hours.  Secure Online Web Server available through Internet or direct dialup
Back to Top	General System Specifications Power  +9 to 15 Vdc (+15 to 28 Vdc optional) Filtered/Fused/Regulated by BIU 500 to 1000 mA (depending on options) Programmable power auto-shutdown Treadle Inputs:  Direct to PCU or isolated (optional) Door Switch Inputs:  Up to 4 inputs Level sensitive, 12 or 24 Vdc Odometer Input:  Analog: 200 mV minimum Digital: 0 to 2V = Logic 0,  > 3V = Logic 1 Engine Run Signal:  Level sensitive, 12 or 24 Vdc Environmental:  -40 to +85 Deg. C,  Dust proof and Splash proof