Omron Programmable Terminals NT631C - Manual (Page 47)

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Names and Functions of Parts Section 2-2
Rear View
Note Confirm system safety before turning the power ON/OFF or resetting.
RDA
TRM
RDB
SDA
SDB
RSA
RSB
24V
+DC
PRINTER PORT B PORT A
RESET
Warning label
Reset switch (inside the cover)
Used to initializes all the statuses of the NT631/NT631C.
However, registered data such as screen data, and memory
switch settings, retain their statuses before initialization.
Serial port B terminal block
Connect the cable for RS-
422A/485 connection to the host
here. Depending on the setting
made at the NT631/NT631C
system menu, communications
through RS-422A/485 are
available. It is not possible to use
this terminal block and the serial
port B connector (9-pin) at the
same time.
GR terminal
Grounding terminal to prevent
malfunction due to noise.
Power input terminals
Connect the power to
the NT631/NT631C at
these terminals.
Battery cover
The battery is secured
underneath this cover.
Serial port A connector
Connect the cable for connection to the host or
Support Tool here. A bar code reader can also
be connected here. This is a 9-pin connector for
RS-232C use only.
Serial port B connector
Connect the cable for RS-232C connection to the host here.
Depending on the setting made at the NT631/NT631C
system menu, communications through RS-232C are
available. This is a 9-pin connector for RS-232C use only.It is
not possible to use this connector and the serial port B
terminal block at the same time.
Printer connector
Connect the printer cable here.
Output conforms to Centronics
specifications.
Expansion interface connector
(under the label)
When using an expansion
interface unit such as a
memory unit, peel off the label
and connect it here.