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122

Connecting to the Host’s RS-422A/485 Port Section 5-2

• Communications using the RS-422A high-speed NT link (1:N) method is

possible only when a Serial Communications Board (CS Series only) or

Serial Communications Unit is installed in a CS/CJ-series CPU Unit.

Connecting between

NT31/NT31C Units

The relay terminal block is not included in this figure. Insert the relay terminal

block so as to achieve the wiring configuration shown below.

Make the connection between pin numbers 9 and 10 at the NT31/NT31C at

the end of the RS-422A cable (marked * in the figure above) only.

For details on handling shield wires, refer to 5-2-8 Handling the Shield on RS-

422A/485 Cables on page 128.

Connecting an NT31/NT31C and a Host

∗

RS-422A

NT31/NT31C Host

∗

13 25

Shielding wire

(

25-

in t

)(

25-

in t

)

NT31/NT31C side

−

TRM

RDB (+)

−

SDA (-)

RDA (-)

−

RSB (+)

RSA (-)

−

Abbreviation

Pin number

RS-232C/

422A/485

connector

Connector

hood