Open (FB)

FUNCTION_BLOCK Open EXTENDS CBM.ETrig

Open a serial com port.

The input Parameters are a list of settings, with which the COM port should be opened.

Example: COMPort = 1, Baudrate = 115200, Parity = None, StopBits = 1

DECLARATION:

MyComOpen : COM.Open;
aParamsB115200 : ARRAY [1..7] OF COM.PARAMETER := [
    (udiParameterId := COM.CAA_Parameter_Constants.udiPort,             udiValue := 1),
    (udiParameterId := COM.CAA_Parameter_Constants.udiBaudrate,         udiValue := 115200),
    (udiParameterId := COM.CAA_Parameter_Constants.udiParity,           udiValue := COM.PARITY.NONE),
    (udiParameterId := COM.CAA_Parameter_Constants.udiStopBits,         udiValue := COM.STOPBIT.ONESTOPBIT),
    (udiParameterId := COM.CAA_Parameter_Constants.udiTimeout,          udiValue := 0),
    (udiParameterId := COM.CAA_Parameter_Constants.udiByteSize,         udiValue := 8),
    (udiParameterId := COM.CAA_Parameter_Constants.udiBinary,           udiValue := 1)
];

IMPLEMENTATION:

So to parameterize the FB looks like:

MyComOpen(usiListLength := SIZEOF(aParamsB115200)/SIZEOF(COM.PARAMETER), pParameterList := ADR(aParamsB115200));
...

InOut:

Scope	Name	Type	Comment	Inherited from
Input	xExecute	BOOL	Rising edge: Action starts Falling edge: Resets outputs If a falling edge occurs before the function block has completed its action, the outputs operate in the usual manner and are only reset if either the action is completed or in the event of an error. In this case, the corresponding output values (xDone, xError) are present at the outputs for exactly one cycle.	ETrig
Output	xDone	BOOL	TRUE: Action successfully completed	ETrig
	xBusy	BOOL	TRUE: Function block active	ETrig
	xError	BOOL	TRUE: Error occurred, function block aborts action FALSE: No error	ETrig
Input	usiListLength	USINT	Number of entries in the pParameterList
	pParameterList	CAA.PVOID	Pointer to ARRAY of parameter entries
Output	eError	ERROR	Local library error ID (0: no error; 5001: time out)
	hCom	CAA.HANDLE	specific Outputs