Omron Programmable Terminals NT631 Setup Manual page 78

Connecting to the RS-232C Port at the Host
Allocation DM area (CH)
Port 1
m
m+1
m+2
m+3
When Using the NT Link
(1:1) Method
SCU21
RUN RDY
ERC ERH
SD1 SD2
RD2
RD1
UNIT
F E
1 0
No.
3 2 D
C B
5 4
A
7 6
9 8
Allocation DM Area Settings for CPU Unit
Settings are written from the Programming Device (a Programming Console
or CX-Programmer) directly into the allocation DM area (system setting area)
of the CPU Unit. After the settings are written, they become effective by turn-
ing the power ON, restarting the Unit, restarting the communications port, or
execution of the STUP command.
In the following, the channel numbers of the allocation DM area and the set-
tings are shown.
m=DM30000+100 × unit # (CH)
Writing Value
Port 2
m+10 8000
m+11 0000
0007
m+12 0000
m+13 0000
Compatible Host Units
Some models and series of OMRON PLCs have the NT link (1:1) function
built in. With CQM1H PLCs, a Serial Communications Board can be added to
provide 1:1 NT Link communications. Some C200HX/HG/HE(-Z)E CPU Units
can be connected by the NT link (1:1) method by installing a Communications
Board.
Check the model and series of the PLC against the type of CPU Unit before
making the connections.
Set the unit number to 0 through F so that
it will not overlap with the numbers used in
other units.
Settings
Host link mode, 2 stop bits, even parity, data
length 7 bits
Communications speed 9600 bps.
Communications speed 19200 bps.
Transmit delay time 0 ms.
No CTS control Unit No.0 for host link
Section 4-1
61