Omron Programmable Terminals NT631C User Manual
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Method for Connection to the Host
Section 2-1
❍: Connection possible
×: Connection not possible
• The RS-232C/RS-422A adapter (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 NT631/NT631C. When con-
necting 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
NT631/NT631C side for communications with the host, but in this case
one NT-AL001 Adapter is required for each NT631/NT631C. In this case,
it is convenient to use serial port A of the NT631/NT631C. +5 V is not out-
put from serial port B.
Communica-
tions Type at
PT
Communica-
tions Type at
Host
Usable Connection Method
Usable Communications
Method
Details
Host
link
NT
Link
(1:1)
NT
Link
(1:N)
Mem-
ory
link
RS-485
RS-232C
Ч
Ч
❍
Ч
Ч
Ч
❍
Ч
RS-485
Ч
Ч
❍
Ч
Ч
Ч
❍
Ч
1:1 connection via a convertor unit
PT
Host
Convertor unit
(NT-AL001)
RS-485
(max. 500 m)
RS-232C
(max. 2 m)
1:N connection via a convertor unit
PT
Host
Convertor unit
(NT-AL001)
RS-485
(total length 500 m)
RS-232C
(max. 2 m)
Direct 1:1 connection
PT
Host
RS-485 (max. 500 m)
1:N connection
PT
Host
RS-485 (total length 500 m)