Recommended Rs-422A/485 Wiring Examples - Omron SYSMAC CS1W-SCB41-V1 Operation Manual

RS-232C and RS-422A/485 Wiring
3-4-2

Recommended RS-422A/485 Wiring Examples

Recommended RS-422A/
485 Cable
1,2,3...
2-Wire Connections
4-Wire Connections
Using a B500-AL001-E Link Adapter
116
1. Always use shielded twisted-pair cables as communications cables.
Model
CO-HC-ESV-3Px7/0.2
2. Connect the shield of the communications cable to the Hood (FG) of the
RS-422A/485 connector on the Serial Communications Board or Unit. At
the same time, ground the ground (GR) terminal of the Power Supply Unit
on the CPU Rack or CS Expansion Rack to 100 Ω or less.
Note Always ground the shield only at the Board/Unit end. Grounding both ends of
the shield may damage the device due to the potential difference between the
ground terminals.
Connection examples are shown below.
Serial Communications
Board/Unit
Pin Signal
Hood
Serial Communications
Board/Unit
Pin
Hood
Serial Communications
Board/Unit
Pin
Signal
Hood
Hirakawa Hewtech Corp.
Shield
Signal
Shield
B500-AL001
Pin
Signal Signal Pin
RS-422
interface
Signal
Pin
Section 3-4
Manufacturer
Remote device
Signal
Remote device
Signal
Remote device
Signal
Remote device
Signal