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2-15
2 Initial Settings and Allocations of Device Variable for CJ-series Unit
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
2-3 De
vice
V
a
ri
a
b
le f
o
r CJ-series Un
it
2
2-3-2 D
e
vice V
ar
ia
b
le f
or CJ-ser
ies Unit f
or System Settings
You can use the following methods to set the Unit settings.
1
Use CX-Protocol or Special Unit Setup Editing screen of Sysmac Studio.
2
Use a user program.
If it is necessary to change the System Settings while the user program is executed, use the user pro-
gram to change the System Settings.
Correct the settings, and make the new setting valid.
Restart the Unit, or change the Port 1/2 Settings Change Flag to TRUE, to make the new setting valid.
For the system-defined variable for each flag, refer to 2-4 System-defined Variable.
The usage of the System Settings differs according to the serial communications mode. For details,
refer to the sections that explain the application when used in each serial communication mode.
Precautions for Correct Use Precautions for Correct Use
When you make Unit settings using Edit Special Unit Settings view of the Unit Configuration on
System Studio, always enable User settings whenever the default settings for port communica-
tions conditions are not used. Otherwise, any changes on the communications setting such as
baud rate will be invalid.
System Setting Procedure
Protocol Macro Mode:
→
Section 4
Serial Gateway:
→
Section 5
No-protocol Mode:
→
Section 6
Modbus-RTU Mode:
→
Section 7
Loopback Test:
→
Section 8
Specify use of User
settings here.
If you do not specify
user settings, all
settings for the serial
communications
mode will be ignored