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Connecting to the Host’s RS-422A/485 Port Section 5-2
5-2-3 Direct Connection between RS-485 Ports at Both Units
The connection method in which the RS-485 ports of an NT631/NT631C and
a host are connected is described here.
Reference: When RS-485 is used at the PT side, only the NT Link (1:N) method (standard
or high-speed) can be used.
Connecting an NT631/NT631C and Host
Wiring When Connecting a CS-series Serial Communications Board, CS/
CJ-series Serial Communications Unit, C-series C200HX/HG/HE(-Z)E
Communications Board, or CQM1H Serial Communications Board
Applicable Units:
Note A Serial Communications Board cannot be installed.
For details on handling shield wires, refer to 5-2-8 Handling the Shield on RS-
422A/485 Cables on page 125.
NT631/NT631C
CPU Unit
9-pin connector
RS-485 cable with connectors (max. length: 500 m)
CS/CJ-series PLC,
C200HX/HG/HE(-Z)E
Serial port B
(RS-422A/485, terminal block)
CS1W-SCU31-V1
CJ1W-SCU31-V1/CJ1W-SCU41(-V1)
CS1G-CPU42/43/44/45-E(V1)
CS1H-CPU63/64/65/66/67-E(V1)
CS1G-CPU42H/43H/44H/45H
CS1H-CPU63H/64H/65H/66H/67H
CS1D-CPU66H/67H (See note.)
C200HE-CPU32/42-(Z)E
C200HG-CPU33/43/53/63-(Z)E
C200HX-CPU34/44/54/64-(Z)E
C200HX-CPU65-ZE/85-ZE
CQM1H-CPU51/61
NT631/NT631C
RS-485
Host
6
5
9
1
Shielding wire
RDA
TRM
RDB
SDA
SDB
RSA
RSB
24V
+DC
Short-circuit tool
PS
CS
SDA (-)
SDB (+)
−
−
RDB (+)
−
NT631/NT631C side PLC side
(9-pin type)
Pin number
1
2
3
4
5
6
7
8
9
Abbreviation
FG
RDA (-)
Abbreviation
RDA (-)
TRM
RDB (+)
SDA (-)
SDB (+)
RSA (-)
RSB (+)
RS-422A/
485
interface
RS-422A
interface
Connector
hood
Functional
ground