Omron NT31 Operation Manuals page 45

Method for Connection to the Host
Communication Communication
Type at PT Type at Host
RS-232C
RS-485 RS-485
RS-485
34
Usable Connection Method
1:1 connection via a convertor unit
PT
Convertor unit
(NT-AL001)
RS-485
(max. 500 m)
1:N connection via a convertor unit
PT
Convertor unit
(NT-AL001)
RS-485
(total length 500 m)
Direct 1:1 connection
PT
RS-485 (max. 500 m)
1:N connection
PT
RS-485 (total length 500 m)
- The RS-232C/RS-422A convertor unit (NT-AL001) requires +5 V, 150 mA at
pin 6 of the RS-232C connector. Check the signals of the RS-232C connector
at the host.
- +5 V is not output from serial port B of the NT31/NT31C. When connecting an
NT-AL001 at serial port B, a separate power supply is required for the NT-
AL001.
- The cable of an NT-AL001 cannot be connected or disconnected while the
power is ON. Always connect or disconnect the cable while the power supply
from the RS-232C cable is OFF (while the host power supply is OFF).
- NT link (1:N) connection is possible even when RS-232C is used at the
NT31/NT31C side for communication with the host, but in this case one NT-
AL001 unit is required for each NT31/NT31C. In this case, it is convenient to
use serial port A of the NT31/NT31C. +5 V is not output from serial port B.
Usable Communication
Host
link
Host
RS-232C
(max. 2 m)
Host
RS232C
(max. 2 m)
Host
Host
f: Connection possible
Section 2-1
Method
Details
NT NT Mem
Link Link ory
(1:1) (1:N) link
f
f
f
f
: Connection not possible
99
104
138
142