1:N Connection Between Rs-422A/485 At The Pt And Rs-232C At The Host - Omron Programmable Terminals NT31 NT31C Setup Manual

Connecting to the Host's RS-232C Port
5-1-3 1:N Connection between RS-422A/485 at the PT and RS-232C at
the Host
92
If there is +5 V output at the PC side, no external power supply is required for
the NT-AL001.
Wiring for a Memory Link Connection
Prepare the adapter cable while referring to the diagram shown below.
1
5
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.
The connection method in which the RS-422A/485 ports of multiple
NT31/NT31Cs are connected to the RS-232C port of one host in a 1:N connec-
tion is described here.
An RS-232C/RS-422A convertor unit (NT-AL001) is used to convert between
the RS-232C and RS-422A/485 communication methods.
NT31/NT31C
Serial port B
(RS-422A/485,
25-pin type)
25-pin connector
Relay terminal block
Max. 2 m
RS-422A terminal
block
RS-422A/485 cable
(max. total length: 500 m)
NT-AL001 side
6
Abbreviation Pin number
Connector
FG
hood
−
1
SD 2
RS-232C
connector
RD 3
RS 4
CS 5
+5V 6
−
7
−
8
SG
9
(9-pin type) Shielding wire
9
No +5 V output is at the host side
A +5 V output is present at the host side
Host link unit/CPU
RS-232C/RS-422A
convertor unit
(NT-AL001)
RS-232C cable with
connectors
9-pin connector
Section
Host side
Abbreviation
Connector
hood
SD
RS-232C
RD
connector
RS
CS
(+5V)
SG
CS1G/H
C200HX/HG/HE(-Z)E
9-pin connector
5-1