Product data

APCI-7xxx-3 Figures and Tables
7.8.4 Current Loop (20 mA) cabling
Active/passive: When a transmitter and a receiver communicate, one of them has
to supply the necessary current. If the transmitter supplies the current, it is active.
The receiver is passive. In reverse, if the receiver supplies the current, it is active.
Fig. 7-25: Active transmission/active reception
Fig. 7-26: Active transmission/passive reception
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