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Connection Examples: Two-wire and Four-wire Transmission Circuits
The transmission circuits for two-wire and four-wire connections are different, as shown in the fol-
lowing diagram.
Example of Four-wire Connections
Example of Two-wire Connections
Two/four-wire
switch
Option Board
Two/four-wire
switch
Option Board
Other Unit
Other Unit
Other Unit
Other Unit
Connect to one of a pair
SDA+/- or RDA+/-.
Set a terminating resistance if it is the end of transmission circuit.
Precautions for Correct Use
• Use the same type of transmission circuit (two-wire or four-wire) for all nodes.
• Do not use four-wire connections when the two/four-wire switch on the Board is set to two-
wire.
• Always install a terminating resistance on the last RS-422A/485 node. Refer to the
NX-series
NX1P2 CPU Unit Built-in I/O and Option Board User’s Manual
(Cat. No. W579) for details on
the wiring example of a terminating resistance.
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Wiring Example: 1:1 Connections
a. Two-wire Connections
SDA -
SDB +
RDA -
RDB +
SHLD
3
4
1
2
5
FG
A(–)
B(+)
RS-422A/485 Option Board
Pin
Signal
Signal
Shield
Remote device
Ground the shield at one end
when using NX1W-CIF12.
b. Four-wire Connections
SDA-
SDB+
RDA-
RDB+
SHLD
3
4
1
2
5
RDA
RDB
SDA
SDB
FG
RS-422A/485 Option Board
Pin
Signal
Signal
Shield
Remote device
Ground the shield at one end
when using NX1W-CIF12.
5 Installation and Wiring
5-76
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
Содержание NX1P2 series
Страница 8: ...Manual Structure 6 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 52: ...Revision History 50 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 82: ...2 System Configuration 2 10 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 170: ...a b Flat blade screwdriver 1 2 5 Installation and Wiring 5 26 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 174: ...4 Close the Memory Card cover 5 Installation and Wiring 5 30 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 176: ...4 Close the Memory Card cover 5 Installation and Wiring 5 32 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 224: ...0 4 mm Side view Front view 2 5 mm 5 Installation and Wiring 5 80 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 258: ...Appendices A 10 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 259: ...I Index I 1 NX series NX1P2 CPU Unit Hardware User s Manual W578 I...
Страница 262: ...Index I 4 NX series NX1P2 CPU Unit Hardware User s Manual W578...
Страница 263: ......