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
Input	`pParameterList`	`CAA.PVOID`	Pointer to ARRAY of parameter entries
Output	`eError`	ERROR	Local library error ID (0: no error; 5001: time out)
Output	`hCom`	`CAA.HANDLE`	specific Outputs