The TRMI 4200MP Serial Lane Interface (SLI) card is a micro processor-based product for interfacing axle-counting treadles with computerized toll systems. The SLI ensures correct sequencing for forward and reverse counts. It continuously tests the state of the treadle strips and reports any changes in the status of the strips. In addition to reporting open, shorted, or intermittent strips, malfunctioning strips are automatically disabled and proper axle-counting will continue; preventing unnecessary maintenance calls. The host computer may interrogate the current strip status and has full control over the operating mode of the Serial Lane Interface.
The incomplete passage of a wheel in either direction or casual walking on the treadle does not produce treadle counts. A directional count is produced only if the vehicle completes passage over the treadle in the initial direction. With a single strip, only forward counts are possible.
The Serial Lane Interface is supplied in two versions. The Stand Alone Version is sold as a single circuit card or in a NEMA enclosure with power supplies and connectors. In the PC Version, the card plugs directly into a standard personal computer slot. Both versions include software which can be used to test and monitor treadles.
Specifications
Inputs:
Direct connection of treadle strip wires. Optically isolated.
Strip voltage is isolated 24 or 48 volts @ 20 ma
Outputs:
RS-232 - DB25 Connector (Standard) Pulse - Forward and Reverse to logic ground. 5 to 30 volt, 100 ma 50 MS duration.
Strip - Debounced open collector to logic ground. 5 to 30 volt, 100 ma.
Physical:
PC Card - 4.75" W x 5.5" L
Enclosure - H 5" x W 10" x D 12"
Interfaces:
Standard communication uses RS-232, transmit, receive, and ground. 9600 Baud, 8 data bits, no parity, one stop bit.
All messages to and from the Serial Lane Interface are in ASCII and are terminated with a carriage return (OD hex).
Key Features
- Intelligent strip processing
- PC-compatible with software
- Automatic failure compensation
- Solid state logic design
- Communicates to other computers
- Automatically adjusts for bad strips
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Operation with four, three, two, or one strip
- Process time of 10 msec or less
- May replace existing treadle logic cards
- Forward and reverse counts maintained internally
- Optical isolation and LED indicators
- Serial, pulsed, or debounced strip outputs
We are pleased to custom-build systems and components for our customers. Please don't hesitate to call us with an idea, a plan or a design.
4200MP SLI Card