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3 Installation and Wiring
3-20
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
z
Recommended RS-422A/485 Cable
We recommend the following wiring method to ensure transmission quality.
1
Always use shielded twisted-pair cables as communications cables.
2
Connect the shield of the communications cable to the Shell (FG) of the RS-422A/485 connec-
tor on the Serial Communications Unit. At the same time, ground the ground (GR) terminal of
the Power Supply Unit on the CPU Rack or Expansion Rack to 100
Ω
or less.
3
Always turn ON the terminating resistance at the end node of the RS-422A/485 line.
Precautions for Correct Use
Precautions for Correct Use
Always ground the shield only at the Unit end. You may damage the device if you ground both
ends of the shield due to the potential difference between the ground terminals.
3-3-2
Recommended RS-422A/485 Wiring Examples
Model
Manufacturer
CO-HC-ESV-3Px7/0.2
Hirakawa Hewtech Corp.
ERC
RUN
RD2
SCU22
RD1
SD2
RDY
NO.
UNIT
ERH
SD1
PORT1
PORT2
0
1
23
4 56
7
89
AB
C
GR
Power Supply Unit
Ground the GR terminal to
ground the Shell (FG).
Hood and GR are
internally connected.
Ground to 100
Ω
or less.
Serial Communications Unit
Содержание CJ1W-SCU22
Страница 192: ...4 Using Protocol Macros 4 56 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 250: ...6 No protocol Mode 6 22 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 460: ...A Standard System Protocol R 126 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 473: ...Index 1 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494 I Index...