Wiring Rs-422 Communication Units; Rs-422 Communications Wiring - Omron E3X-DRT21 Operation Manual

Wiring RS-422 Communication Units

4-4 Wiring RS-422 Communication Units
4-4-1

RS-422 Communications Wiring

The RS-422 Connector pin arrangement is as follows:
RDB
RDA
SDB
SDA
SG
• Multidrop wiring can be used. (The left and right terminals are internally
connected to allow multidrop connections).
• Connect the RS-422 in a 1:1 or a 1: N configuration.
For a 1:N configuration, up to 32 nodes can be connecting, including the
host computer or PLC.
• The total cable length is 500 m max.
• Use shielded, twisted-pair cables with a wire gauge of AWG24 to AWG12.
FG
SDB
SDA
RDB
RDA
Note 1. The following crimp terminals are recommended for cables.
• Phoenix Contact AI Series
AI0, 5-8 (AWG20) or other (Use a crimp terminal appropriate for the
wire diameter)
The following tool is recommended.
ZA3 manufactured by Phoenix Contact
• Nichifu TC Series
TME TC-1.25-11 (AWG22 to AWG16) or other (Use a crimp terminal
appropriate for the wire diameter.)
The following tool is recommended.
NH-32 manufactured by Nichifu
RDB
RDA
SDB
SDA
SG
RDB
RDA
SDB
SDA
SG
RDB
RDA
SDB
SDA
SG
RDB
RDA
SDB
SDA
SG
Connect terminating resistance
to the last Communication Unit.
Section 4-4
73