Omron Programmable Terminals NT631 Setup Manual page 105

Connecting to the Host's RS-232C Port
Connection between
NT631/NT631C Units (RS-
422A)
88
The relay terminal board is not included in the figure below. Insert a relay ter-
minal board so as to achieve the wiring configuration indicated below.
NT631/NT631C
RS-422A
:
RDA NT631/NT631C side
TRM
RDB
RS-422A/
485
SDA
terminal
block
SDB
RSA
RSB
24V
+DC
* Short TRM and RDA terminals of the NT631/NT631C at the end of the RS-
422A 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.
Host
NT-AL001
NT631/NT631C side
Short-circuit tool
Abbreviation Abbreviation
:
RDA (-)
RDA (-)
TRM
TRM
RDB (+)
RDB (+)
SDA (-)
SDA (-)
SDB (+)
SDB (+)
RSA (-)
RSA (-)
RSB (+)
RSB (+)
Functional Functional
Shielding
ground ground
wire
Section 5-1
RDA
TRM
RDB
RS-422A/
485
terminal
SDA
block
SDB
RSA
RSB
24V
+DC