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Connecting with 1:N NT Links
Setting the Front Panel Switches
Using RS-422A/485
RDY
COMM1
COMM2
Section 3-5
Port 1
RS-232C
OFF
2
PORT1
ONTERM
4 WIRE
Terminating resistance switch (TERM)
Set to ON:
Terminating resistance used
(right position)
Two-wire/four-wire switch (WIRE)
Port 2
RS-422A/485
SCB41
PORT2
(RS422/
RS485)
For RS-422A:
Set to 4 for four-wire (right position).
For RS-485:
Set to 2 for two-wire (left position).
Connecting to CS-series
Serial Communications
Units
CS1W-SCU21 (Both ports 1 and 2 are RS-232C ports.)
CPU Unit DM Area Settings
Using RS-232C
Write the settings directly from the Programming Device or Support Software
(Programming Console or CX-Programmer) to the DM Area (Parameter Area)
in the CPU Unit. After writing the settings, enable the settings by turning ON
the power again, restarting the Unit, restarting the communications port, or
executing the CHANGE SERIAL PORT SETUP (STUP) instruction.
The following table shows the allocated DM Area words and settings.
m = 30000 + 100 × unit number
Allocated DM Area words
Port 1 Port 2
Write value
Settings
DM m
DM m+1
DM m+10
DM m+11
8200
0000 to 0009
1:N NT Link Mode
Baud rate (normal)
(See note 1.)
DM m+6
DM m+16
000 @
@ : Largest unit number (0 to 7) of the
connected PTs.
Note
Precautions
for Correct Use
(1) Set the baud rate to a numeric value between 0000 to 0009 Hex. (The
setting is the same for any value between 0000 and 0009 Hex.)
When setting a 1:N NT Links in the CX-Programmer, set the baud rate
to 38,400 bps.
Setting the Front Panel Switches
Using RS-232C
Set the unit number of the Serial Communications Unit with the rotary
switches on the front of the Unit. Use a flat-blade screwdriver to set the
numerals and symbols in the switches setting display window, as follows:
35
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