Omron NT31 Setup Manual

93
Connecting to the Host’s RS-232C Port Section 5-1
Recommended connectors, cables and crimp terminals for RS-422A/485
When making an RS-422A/485 connecting cable, as far as possible
use the recommended parts indicated in the table below. Some Units
come supplied with one connector and connector hood.
Check the required parts and prepare them in advance.
The terminal screws of the NT-AL001 are M3 specification. When wiring,
use crimp terminals for M3 use. Tighten terminal screws with a tightening
torque of 0.5 N
⋅m.
Note Always use crimp terminals for wiring.
Examples of applicable terminals
5-1-5 Setting the Terminal Resistance for RS-422A/485
Communications
The serial port B connector of the NT31/NT31C has a terminal resistance set-
ting terminal (TRM).
In RS-422A/485 communications, a terminal resistor must be set at the device
at the end of the communications cable, but not at any other device.
The NT31/NT31C has a built-in terminal resistor, and whether or not the ter-
minal resistance is applied is set by the wiring at the terminal resistance set-
ting terminals (pins No. 9 and 10 of serial port B). The terminal resistance is
120
Ω. When carrying out RS-422A/485 communications using serial port B,
short between terminals No. 9 and 10 at the NT31/NT31C at the end of the
RS-422A/485 cable. Leave terminals No. 9 and 10 open at NT31/NT31C PTs
other than the one at the end of the cable.
When not using RS-422A/485 communications, the terminal resistance set-
ting is ineffective.
In order to set the terminal resistance, wiring work is required at the cable’s
connector: carry out the wiring correctly by referring to Appendix E Making the
Cable.
Name Model Maker Remarks
Connector XM2A-2501 25-pin type
Made by OMRON
Delivered with the following Units:
C500-LK203
DB-25P F-N 25-pin type
Made by JAE
Delivered with the following Units:
3G2A6-LK201-EV1
3G2A5-LK201-EV1
Connector
hood
XM2S-2511 25-pin type
Made by OMRON
Delivered with the following Units:
C500-LK203
DB-C2-J9 25-pin type
Made by JAE
Delivered with the following Units:
3G2A6-LK201-EV1
3G2A5-LK201-EV1
Cable TKVVBS4P-03 Tachii Electric Wire
Co., Ltd.
Crimp
terminals
1.25-N3A
(fork type)
Japan Solderless
Terminal MFG
Recommended cable size:
AWG22 to 18
(0.3 to 0.75 mm
2
)
Y1.25-3.5L
(fork type)
Molex Inc.
Fork type
6.2 mm max.
Round type
6.2 mm max.

Omron NT31 Specifications

General

Brand	Omron
Model	NT31
Category	Touch terminals
Language	English