전류 루프 통신의 광접합 소자 특성 비교 분석

Current Loop Communication is suitable for long distance because it separate emitter and detector by electronics. Emitter of photocoupler covert signal to light and current can flow by the light in transmitter. And photocoupler covert light to singal in receiver. So selection of photocoupler is important in current loop communication as various production company make a lot of photocouplers today. Therefore we need to analyze characteristic of photocouplers and select proper them. In this paper, we propose characteristic of various photocouplers. Also, we describe attention point of circuit configuration for interface.