The SL MA-210 serves as the interface between the fiber optic sensor and the processing unit on system level. It should be installed indoors or in a weatherproofed road side cabinet. The interface responds to the optical sensor signal in a dynamic (AC-coupled) manner, i.e. the electrical signal caused when a load is applied to the sensor decreases to zero as the load remains applied. At a tunable threshold, a digital trigger signal per channel is generated. This signal is automatically reset after an adjustable time period. These characteristics allow the SL MA-210 interface to operate without the need for adjustment. If the interface detects an interruption in the light transmission path of any channels, it flashes a particular light for each interrupted channel. The output signals (trigger signals) are transmitted via optocouplers which behave similar to relays, allowing the use of a variety of output circuitry.
2 channel digital interface
Up to 30dB dynamic range with IR LED lasers
Flexible optocoupler digital outputs
Trigger level and minimum pulse duration are adjustable via jumpers
Sensor failure indication
Designed for compatibility with existing toll equipment
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