4-2 1:N Host Connection
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:
Unit number setting
Set a value between 0 and F that is not the same
as that of other Units in the system.
CJ-series Units: CJ1W-SCU41 (Port 1 is an RS-422A port and Port 2 is an RS-
232C port.)
CPU Unit DM Area Settings
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) instruc-
tion.
The following table shows the allocated DM Area words and settings.
The allocations and settings are the same for RS-232C and RS-422A.
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 0000 to 0009 (See note 1.) Baud rate (normal)
DM m + 6 DM m + 16
000@ @: Largest unit number (1 to 7) of the
connected 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.
Reference When setting a 1:N NT Link in the CX-Programmer, set the baud rate to 38,400 bps.
4-14
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