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Connecting to the Host’s RS-232C Port Section 5-1
Wiring for a Memory Link Connection
Prepare the adapter cable while referring to the diagram shown below.
Since it is necessary to input a voltage of +5 V to the number 6 pin of NT-
AL001, supplying a voltage of 5 V from the host or an external voltage supply
for NT-AL001 is required.
5-1-3 1:N Connection between RS-422A/485 at the PT and RS-232C at
the Host
The connection method in which the RS-422A/485 ports of multiple NT631/
NT631Cs are connected to the RS-232C port of one host in a 1:N connection
is described here.
An RS-232C/RS-422A Adapter (NT-AL001) is used to convert between the
RS-232C and RS-422A/485 communications methods.
(9-pin type)
Shielding wire
No +5 V output is at the host side
A +5 V out
p
ut is
p
resent at the host side
NT-AL001 side
Host side
1
6
5
9
Abbreviation Pin number
Abbreviation
RS-232C
connector
Connector
hood
RS-232C
connector
1
2
3
4
5
6
8
9
FG
−
SD
RD
RS
CS
+5V
−
−
SG
SD
RD
RS
CS
+5V
SG
Connector
hood
NT631/NT631C
Host Link Unit or CPU Unit
9-pin connector
9-pin connector
NT631/NT631C
NT631/NT631C
RS-422A/485 cable
(max. total length: 500 m)
Serial port B
(RS-422A/485, terminal block)
RS-422A terminal
block
RS-232C cable with
connectors
RS-232C/RS-422A
convertor unit
(NT-AL001)
CS/CJ-series PLC,
C200HX/HG/HE(-Z)E