Omron Programmable Terminals NT631 Setup Manual page 139

Connecting to the Host's RS-422A/485 Port
Connecting between NT631/NT631C Units
Connecting an NT631/
NT631C and a Host
122
NT631/NT631C
RS-485
∗
NT631/NT631C side
Abbreviation
RDA
RDA (-)
TRM
TRM
RS-422A/
RDB (+)
485
RDB
terminal
SDA (-)
block
SDA
SDB (+)
RSA (-)
SDB
RSB (+)
RSA
Functional
ground
RSB
24V
+DC
* Short TRM and RDA terminals of the NT631/NT631C at the end of the RS-
485 cable (* marked in the above figure) using the short-circuit tool sup-
plied with the NT631/NT631C.
For details on handling shield wires, refer to 5-2-8 Handling the Shield on RS-
422A/485 Cables on page 125.
The relay terminal block is not included in this figure. Insert the relay terminal
block so as to achieve the wiring configuration shown below.
NT631/NT631C
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:
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.)
Host
NT631/NT631C side
Short-circuit tool
Abbreviation
∗
RDA (-)
TRM
RS-422A/
485
RDB (+)
terminal
SDA (-) block
SDB (+)
RSA (-)
RSB (+)
Functional
ground
Shielding wire
RS-485
Section 5-2
RDA
TRM
RDB
SDA
SDB
RSA
RSB
24V
+DC
Host