Importance

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Abstract

This invention relates to a digital communication circuit which is particularly adapted to be used in factories employing flexible machining systems where pallets supporting workpieces are moved from one work station to another. An identification transponder in accordance with this invention is powered by a battery supply and travels on the pallet. Once the pallet is in close proximity to a work station, a flash of light is provided by an interrogator which is received by a transponder. The transponder is then activated to transmit a light signal modulated by a stored binary coded identification word which is received by the interrogator. The identification code is transmitted by the transponder through the use of frequency shift keying modulation. The circuit according to this invention features low battery current draw during the normally unenergized condition and further provides a battery voltage monitoring circuit.

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First Claim