NT31C-ST143-EV3 Omron, NT31C-ST143-EV3 Datasheet - Page 112

• 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

5-2-1
Connecting to the Host’s RS-422A/485 Port
Host Types and Settings
Reference:
Note
One end of the wire must always be connected to the host (PLC), and there
must be no branching. Branching will cause problems such as transmission
delays and communications failures.
CS/CJ-series CPU Units cannot be connected with the 1:1 connection NT link
method. Use the 1:N connection NT link method (standard or high-speed) in-
stead to make the 1:1 connection. For details, refer to Using the NT link (1:N)
Method (page 109) or Using the High-speed NT link (1:N) Method (page 113).
The types of host that have an RS-422A port and can be connected to the
RS-422A/485 port of the NT31/NT31C, and the settings to be made at the
host, are described here.
(Not at
termination)
NT31C
• Method in which the RS-422A ports of multiple NT31/NT31Cs and the
• Method in which the RS-485 ports of multiple NT31/NT31Cs and the RS-
PLC
RS-422A port of the host are connected in a 1:N connection (page 121).
485 port of the host are connected in a 1:N connection (page 124).
Example of Good Connection
(At termination)
(Not at
termination) (Not at
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 type NT link (1:N)
method (standard or high-speed).
This connection method is used with the RS-485 type NT link (1:N)
method (standard or high-speed).
NT31
PT
PT
PT
termination)
NT31
Relay terminal block
Max. 2 m
RS-485 cable
(max. total length 500 m)
RS-422A cable
(max. total length 500 m)
RS-485 cable
(max. 500 m)
(At
termination)
NT31
NT31
NT31C
Host
Host
Host
PLC
Examples of Bad Connections
NT31
NT31
NT31C
Section 5-2
PLC
Relay terminal block
NT31
95