Making Rs-422A/485 Connecting Cable - Omron NV Series Setup Manual

Wiring the Power Supply and Serial Communications
4-4-5

Making RS-422A/485 Connecting Cable

Wiring Cables (RS-422A or RS-485)
74
■
Recommended Cable
Use shielded twisted-pair cables for communications cables.
Recommended RS-442A/485 Cables
Model
CO-HC-ESV-3P×7/0.2
■ Grounding
Connect the shield wire from the Communications Cable to the shell (FG) on
the RS-422A/485 connector on the Serial Communications Board/Unit.
At the same time, ground to 100 Ω or less the ground terminal on the Power
Supply Unit on the CPU Rack or the Expansion Rack.
Note (1) Use shielded cables for wiring.
(2) Use only one type of transmission cable. Do not use two different types
of cable together.
(3) When cross-connecting lines and using a shielded cable for the RS-485
transmission path, ground only one end of the line. Do not connect it at
both ends. If the line is grounded at both ends, it may cause damage due
to the electric potential between the ground points.
■
Wiring the Connector
To connect the cable to the Serial Communications Unit/Board, use the
(XM3A-0921 or the equivalent model) Plug and (XM2S-0911-E or the equiva-
lent model) Hood included with each port on the Unit/Board and solder the
wires to the connector.
1 mm
Heat-shrinking tube,
Hishi Tube F, Internal
diameter: 1.5 mm,
Length: 10 mm
Refer to the manual for the Serial Communications Board/Unit (Cat. No.
W336) for details on wiring the connector.
Manufacturer
Hirakawa Hewtech Corporation
Soldering
Section 4-4
Restriction
Total length: 500 m max.,
T-brand drop line length:
10 m max.