高電平時接成形式，低電平輸入時接成形式。圖2(c)為差動型接法，它具有兩個約束條件，對于防止干擾有明顯的優(yōu)越性，適用于外部干擾嚴(yán)重的環(huán)境，當(dāng)外部設(shè)備電流較大時，其傳輸距離可達100~200m，圖2(d)考慮到COMS電路的輸出驅(qū)動電流較小，不能直接帶動發(fā)光二極管，所以加接一級晶體管作為功率放大，需要注意的是圖中發(fā)光二極管和光敏三極管應(yīng)分別由兩個電源供電，電阻值視電壓高低選取

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