4-3 High-speed 1:N NT Link
Setting the Front Panel Switches
• Using RS-422A
Port 1
RS-232C
Port 2
RS-422A
Terminating resistance switch (TERM)
Set to ON:
Terminating resistance used
(right position)
Two-wire/four-wire switch (WIRE)
For RS-422A:
Set to 4 for four-wire (right position).
Connecting to CS-series Serial Communications Units
CS-series Rack-mounted Type:
CS1W-SCU21
Reference
High-speed 1:N NT Links can be used with Serial Communications Boards and Serial
Communications Units from lot numbers 991220 (December 20, 1999) or later. Boards
and Units with earlier lot numbers cannot be used, so confirm that the lot number is
supported.
CPU Unit DM Area Settings
Write the settings directly from the Programming Device (Programming Console) or Support
Software (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) instruc-
tion.
The following table shows the allocated DM Area words and settings.
Using RS-232C
m = 30000 + 100 × unit number
Allocated DM Area words
Port 1 Port 2
Write value
Settings
DM m DM m + 10 8200 1:N NT Link Mode
DM m + 1 DM m + 11 000A Baud rate (high-speed)
DM m + 6 DM m + 16
000@ @: Largest unit number (1 to 7) of the connected
PTs. (See note.)
Note: When connecting a single Unit in a 1:N connection, set the value of @ to 1 or higher.
Reference
To set high-speed 1:N NT Link communications from the CX-Programmer, set the baud
rate to 115,200 bps.
4-21
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