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Chapter 3 Creating and Editing Screens
GETCHARS (Get Characters by COM Port)
Equation
Var1 = GETCHARS (Var2, Var3, Var4)
Explanation
This command gets characters by COM port. Var1 is the response value after the
communication, Var2 is the starting address of transmission data, Var3 is the data
length, and Var4 is the allowance communication time (unit is ms). The result will be
stored in Var1.
Remark
Var1: Response value after communication
1: Completed normally
0: Failed
Var1 and Var2 can be internal memory only. Var3 and Var4 can be internal
memory or constant.
Example
Get three consecutive WORD data starting from $1 and store the result in $0.
SELECTCOM (Select COM Port)
Equation
SELECTCOM (Var1)
Explanation
This command is used to select COM port. When not connecting to the external
controller (set PLC to NULL) in Options > Configuration in Screen Editor software
program, the user can use two COM ports (0:COM1, 1:COM2, 3:COM3 (for some
models only)) at the same time.
Revision May, 2010 3-359