Product data

APCI-7xxx-3 Figures and Tables
RS485 cabling
Fig. 7-8: RS485 cabling - 4-port interface
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. 7-9: Active transmission/active reception
4-port serial interface
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