NT631C-ST153-EV3 Omron, NT631C-ST153-EV3 Datasheet - Page 110

• Manufacturer Part Number: NT631C-ST153-EV3
• Description: 10.48-ColrDisplay,TFT,Ivy,Eng
• Manufacturer: Omron

Specifications of NT631C-ST153-EV3

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

5-2
Connecting to the Host’s RS-422A/485 Port
Connecting to the Host’s RS-422A/485 Port
Reference:
The methods for connecting the RS-422A/485 port of the NT631/NT631C 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-@).
• The internal circuit of the NT631/NT631C is shown below.
• For details on setting the terminal resistance of NT-AL001, refer to Set-
• Method in which the RS-422A ports of the NT631/NT631C and host are
• Method in which the RS-485 ports of the NT631/NT631C and host are
• Method in which the RS-422A ports of multiple NT631/NT631Cs and the
• Method in which the RS-485 ports of multiple NT631/NT631Cs and the
tings at the RS-232C/RS-422A Adapter (NT-AL001) (page 81).
connected directly by an RS-422A cable (page 115).
connected by an RS-485 cable (page 118).
RS-422A port of the host are connected in a 1:N connection (page 119).
RS-485 port of the host are connected in a 1:N connection (page 121).
When this method is used, the cable length can be extended up to
500 m.
When this method is used, the cable length can be extended up to
500 m.
This connection method can be used only with the NT Link (1:N) meth-
od (standard or high-speed) of type RS-485.
This connection method is used with the RS-422A NT Link (1:N) meth-
od (standard or high-speed).
+
-
Terminal resistor (120 Ω)
PT
PT
PT
RDA
TRM
RDB
RS-422A cable
(max. total length 500 m)
RS-422A cable
(max. 500 m)
RS-485 cable
(max. 500 m)
Making a connection here inserts a terminator between
+ (RDB) and - (RDA).
Host
Host
Host
Section 5-2
93