Direct Connection Between Rs-485 Ports At Both Units - Omron NT31 Setup Manual

Connecting to the Host's RS-422A/485 Port
1
13
5-2-3

Direct Connection between RS-485 Ports at Both Units

14
NT31/NT31C side
Abbreviation Pin number
Connector
FG
hood
−
1
SD
2
3
RD
RS-232C/
422A/485
4
RS
connector
CS
5
−
6
SG
7
−
8
9
TRM
−
10
RDB (+)
11
SDB (+)
−
12
−
13
−
14
SDA (-)
15
25
16
RDA (-)
−
−
−
RSB (+)
23
RSA (-)
24
−
25
(25-pin type)
For details on handling shield wires, refer to 5-2-8 Handling the Shield on RS-
422A/485 Cables on page 128.
Wiring for a Memory Link Connection
Prepare the adapter cable while referring to the following diagram.
1
14
NT31/NT31C side
RS-232C/
422A/485
connector
13 25
For details on handling shield wires, refer to 5-2-8 Handling the Shield on RS-
422A/485 Cables on page 128.
The connection method in which the RS-485 ports of an NT31/NT31C and a
host are connected is described here.
PLC (CPU Unit) side
Pin number
Abbreviation
Connector
FG
hood
1
SDA
2
SDB
−
3
4
RS
5
CS
6
RDA
−
7
8
RDB
9
−
(9-pin type)
Shielding wire
Abbreviation Pin number
Connector
FG
hood
−
1
SD
2
3
RD
4
RS
CS
5
−
6
SG
7
−
8
9
TRM
−
10
RDB (+)
11
SDB (+)
−
12
−
13
−
14
SDA (-)
15
16
RDA (-)
−
Shielding wire
−
−
RSB (+)
23
RSA (-)
24
−
25
(25-pin type)
Section 5-2
1
RS-422A
5
connector
Host side
Abbreviation
Connector
hood
SDA
SDB
RS-422A
connector
RS
CS
ROA
ROB
119
6
9