4-3 High-speed 1:N NT Link
Connecting to CS-series Serial Communications Boards
Serial Communications Boards with RS-232C Port for Use with CS-series CPU Units:
CS1W-SCB21 (Both ports 1 and 2 are RS-232C ports.)
CS1W-SCB41 (Port 1 is an RS-232C port and Port 2 is an RS-422A port.)
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 sup-
ported.
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. The settings are the
same for RS-232C and RS-422A (CS1W-SCB41 Port 2).
Allocated DM Area words
Port 1 Port 2
Write
value
Settings
DM32000 DM32010 8200 1:N NT Link Mode
DM32001 DM32011 000A Baud rate (high-speed)
DM32006 DM32016
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.
For example, to connect PTs with unit numbers 3 to 6 to Port 1 in 1:N NT Links, set DM32000
to 8200 Hex, DM32001 to 000A Hex, and DM32006 to 0006 Hex.
Serial Communications Boards with RS-422A Port for Use with CS-series CPU Units:
CS1W-SCB41 (Port 2 is an RS-422A port.)
Reference
To set high-speed 1:N NT Link communications from the CX-Programmer, set the baud
rate to 115,200 bps.
4-20
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