4. Configuration
204
finished. The time unit is 10µs. This output
parameter type is important to detect the silence
time in protocols as MODBUS RTU. It might not
be the silence time after the last received
character by this function block, as it is only true if
RX_REMANING = 0.
Table 4-142. SERIAL_RX_EXTENDED Output Parameters
Utilization example in ST language, after the library is inserted in the project and the serial port
configured:
PROGRAM MainPrg
VAR
Receive_Ex: SERIAL_RX_EXTENDED;
Port: SERIAL_PORT := COM1;
Buffer_Pointer: ARRAY [0..1023] OF SERIAL_RX_CHAR_EXTENDED;
Status: SERIAL_STATUS;
END_VAR
//INPUTS:
Receive_Ex.REQUEST := TRUE;
Receive_Ex.PORT := Port;
Receive_Ex.RX_BUFFER_POINTER := ADR(Buffer_Pointer);
Receive_Ex.RX_BUFFER_LENGTH := 1024; //Max size.
Receive_Ex.RX_TIMEOUT := 10000;
//FUNCTION:
Receive_Ex();
//OUTPUTS:
Receive_Ex.DONE;
Receive_Ex.EXEC;
Receive_Ex.ERROR;
Status := Receive_Ex.STATUS; //If it’s necessary to treat the error
Receive_Ex.RX_RECEIVED;
Receive_Ex.RX_REMAINING;
Receive_Ex.RX_SILENCE;
SERIAL_SET_CTRL
This block is used to write on the control signals (RTS and DTR), when they are available in the
serial port. It can also set a busy condition for the transmission, through BREAK parameter and it can
only be used if the modem signal is configured for RS232_MANUAL.
Figure 4-100. Block for Control Signals Writing
To Next Page
Loading...
General