4-2 1:N Host Connection
4-14
Connecting to CS-series Serial Communications Boards
Serial Communications Boards with RS-232C and RS-422A Ports 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.)
Setting DM Area Allocations in CPU Unit
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, restart-
ing the communications port, or executing the CHANGE SERIAL PORT SETUP (STUP) in-
struction.
The following table shows the allocated DM Area words and settings.
The allocations and 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 0000 to 0009
(See note 1.)
Baud rate (normal)
DM32006 DM32016
000@ @: Largest unit number (1 to 7) of the con-
nected PTs. (See note 2.)
Note 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.)
2. When using a 1:N connection, set the value for @ 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 0000 Hex, and DM32006 to 0006 Hex.
Reference
When setting a 1:N NT Link in the CX-Programmer, set the baud rate to 38,400 bps.
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