Omron Programmable Terminals NT631C - Manual (Page 105)

88
Connecting to the Host’s RS-232C Port Section 5-1
Connection between
NT631/NT631C Units (RS-
422A) 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.
* 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.
:
RS-422A
NT631/NT631C Host
NT-AL001
:
Abbreviation
RDA (-)
TRM
RDB (+)
SDA (-)
SDB (+)
RSA (-)
RSB (+)
NT631/NT631C side NT631/NT631C side RDA
TRM
RDB
SDA
SDB
RSA
RSB
24V
+DC
RDA
TRM
RDB
SDA
SDB
RSA
RSB
24V
+DC
Short-circuit tool
Abbreviation
RDA (-)
TRM
RDB (+)
SDA (-)
SDB (+)
RSA (-)
RSB (+)
RS-422A/
485
terminal
block
Functional
ground Functional
ground
RS-422A/
485
terminal
block
Shielding
wire