NT31C-ST143-EV3 Omron, NT31C-ST143-EV3 Datasheet - Page 111

• Manufacturer Part Number: NT31C-ST143-EV3
• Description: 5.7 8-Color Dsp,STN,Ivory,Eng
• Manufacturer: Omron

Specifications of NT31C-ST143-EV3

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Connecting to the Host’s RS-422A/485 Port
5-2
94
Connecting to the Host’s RS-422A/485 Port
Reference:
Note
Before connecting or disconnecting cables between devices, make sure that
the power supply to all of the connected devices (NT31/NT31C, PLC, etc.) is
OFF.
The methods for connecting the RS-422A/485 port of the NT31/NT31C and
the RS-422A/485 port of the host are described here. There are the following
methods.
The following discussion is focused on the connection method to OMRON
PLCs (By using the memory link method, a connection can be made to any
arbitrary RS-422 unit). When making a connection to a host other than
OMRON PLCs, refer to the PLC Connection Manual (V042-E1-@) or Multi
Vendor Connection Manual (V060-E1-@).
Shorted
Open
Pin Nos. 9 and 10
• The internal circuit of the NT31/NT31C is shown below.
• For details on setting the terminal resistance of NT-AL001-E, refer to Set-
• Method in which the RS-422A ports of the NT31/NT31C and host are
• Method in which the RS-485 ports of the NT31/NT31C and host are con-
tings at the RS-232C/RS-422A Adapter (NT-AL001-E) (page 81).
connected directly by an RS-422A cable (page 116).
When this method is used, the cable length can be extended up to 500 m.
nected by an RS-485 cable (page 119).
PT
When this method is used, the cable length can be extended up to
500 m.
−
+
RS-422A cable
(max. 500 m)
Terminal resistance is applied.
Short only at the NT31/NT31C connected to the end of an RS-
422A/485 cable.
Terminal resistance is not applied.
Leave the terminals open when connecting an NT31/NT31C
anywhere other than at the end of the RS-422A/485 cable.
Terminal resistor (120 Ω)
10 (RDB)
16 (RDA)
9 (TRM)
Abbreviation
-
-
RDB (+)
SDB (+)
TRM
FG
-
-
-
-
-
Pin number
-
Connector
hood
10
11
12
25
-
9
-
Host
Making a connection here inserts
a terminator between + (RDB)
and - (RDA).
Terminal resistor setting
Function
Section 5-2