Omron CP1E Series - Wiring for Serial Communications; A-4-1 Recommended RS-232 C Wiring

A-33
Appendices
CP1E CPU Unit Hardware User’s Manual(W479)
A-4 Wiring for Serial
Communications
App
A-4-1 Recommended RS-232C Wiring
A-4 Wiring for Serial Communications
This method can be used only with a CP1E N-type CPU Unit.
We recommend the following wiring method for the RS-232C, especially in environments prone to
noise.
1 Use shielded twisted-pair cables for the communications cables.
• Recommended RS-232C Cables
2 Combine a signal wire and SG (signal ground) wire in a twisted-pair cable.
At the same time, bundle the SG wires at the connectors on Option Board and the remote
device.
3 Connect the shield of the communications cable to the hood (FG) of the RS-232C connector on
the Option Board.
At the same time, ground the ground terminal (GR) of the CPU Unit to 100 Ω or less.
z Connection Example
Example: Twisted-pair Cable Connecting SD-SG, and RD-SG Terminals in Host Link Mode
A-4-1 Recommended RS-232C Wiring
Recommended RS-232C Wiring
Model numbers Manufacturer
UL2464 AWG28x5P IFS-RVV-SB (UL product)
AWG28x5P IFVV-SB (non-UL product)
Fujikura Ltd.
UL2464-SB (MA) 5Px28AWG (7/0.127) (UL product)
CO-MA-VV-SB 5Px28AWG (7/0.127) (non-UL product)
Hitachi Cable,
Ltd.
1
2
3
4
5
6
7
8
9
CD
RD
SD
ER
SG
DR
RS
CS
CI
1
2
3
4
5
6
7
8
9
FG
SD
RD
RS
CS
5V
DR
ER
SG
CPU Unit
DOS/V computer
Signal SignalPin Pin
RS-232C
interface
RS-232C
interface
D-sub, 9-pin connector (male)
D-sub, 9-pin connector (female)
SG signal wires
Bundle the SG wires
Aluminum foil
XM2S-0911-E