Precautions In Wiring Serial Communications - Omron NV Series Setup Manual

Wiring the Power Supply and Serial Communications
4-4-6

Precautions in Wiring Serial Communications

Wiring the NV3W(-V1) for a
5-V Input and RS-232C
Communications
Wiring the NV3W(-V1),
NV4W, or NV3Q for a 24-V
Input and RS-232C
Communications
1,2,3...
There are precautions related to the communications specifications that must
be observed when wiring the serial communications/power connector and
power terminals. Wire according to the following information.
Applicable models: NV3W-MG20L(-V1) and NV3W-MR20L(-V1)
• Route the cables so that noise does not enter the system through them.
• Use shielded cables for wiring.
• Conforms to CE Marking, provided that the cable shield is grounded to
100 Ω or less, as shown below.
• NV3W
100 mm max.
28 mm max.
Ferrite core
• NV3W-V1
Shield
Applicable models: NV3W-MG20(-V1), NV3W-MR20(-V1), NV4W-MG21,
MV4W-MR21, NV3Q-MR21, and NV3Q-SW21
• The NV3W does not have RS and CS control lines.
• Route the cables so that noise does not enter the system through them.
• Use shielded cables for wiring.
• The PTs are certified for CE Marking under the condition that the follow-
ing wiring is used.
1. The cable shield must be grounded to 100 Ω or less.
2. Ground the FG (functional ground) terminal to 100 Ω or less.
3 turns
Shield
SD
RD
RS
CS
SG
Section 4-4
75