Rs422 Cabling; Rs485 Cabling; Current Loop (20 Ma) Cabling; Fig. 7-14: Rs422 Cabling - 1-Port And 2-Port Serial Interface - Addi-Data ADDICOM APCI-7300 Technical Description

APCI-7xxx

RS422 cabling

Fig. 7-14: RS422 cabling - 1-port and 2-port serial interface

RS485 cabling

Fig. 7-15: RS485 cabling - 1-port and 2-port serial 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.
Connecting the peripheral
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