4. Configuration
198
This variable, when true, enables the function
block use.
Select the serial port, as described in the
SERIAL_PORT data type.
Table 4-133. SERIAL_GET_CTRL Input Parameters
This variable is true when the block is
completely executed. It is false otherwise.
This variable is true while the block is being
executed. It is false otherwise.
This variable is true when the block concludes
the execution with an error. It is false otherwise.
It is connected to the variable DONE, as its
status is showed after the block conclusion.
In case the ERROR variable is true, the
STATUS structure will show the error found
during the block execution. The possible states,
already described in the SERIAL_STATUS data
type, are:
- NO_ERROR
- ILLEGAL_SERIAL_PORT
- PORT_BUSY
- HW_ERROR_UART
- HW_ERROR_REMOTE
- FB_GET_CTRL_NOT_ALLOWED
- NOT_CONFIGURED
Value read in the CTS control signal.
Value read in the DSR control signal.
Value read in the DCD control signal.
Table 4-134. SERIAL_GET_CTRL Output Parameters
Utilization example in ST language, after the library is inserted in the project and the serial port
configured:
PROGRAM MainPrg
VAR
Get_Control: SERIAL_GET_CTRL;
Port: SERIAL_PORT := COM1;
Status: SERIAL_STATUS;
END_VAR
//INPUTS:
Get_Control.REQUEST := TRUE;
Get_Control.PORT := Port;
//FUNCTION:
Get_Control();
//OUTPUTS:
Get_Control.DONE;
Get_Control.EXEC;
Get_Control.ERROR;
Status := Get_Control.STATUS; // If it’s necessary to treat the error.
Get_Control.CTS_VALUE;
Get_Control.DSR_VALUE;
Get_Control.DCD_VALUE;
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