Receiving from a Port – ESDL

If your software component uses a SenderReceiver or NVData interface as Rport, at least one runnable entity must receive data over the interface. Use one of the following possibilities to specify receiving data:

• Implicit
• Explicit (without status)
• Explicit with status

Rules and restrictions are listed here: Sender-Receiver Communication -Rules

Implicit

1. Open the SWC you want to edit.

2. Enter the following code to use implicit read:

   <variable> = <SRinterface>.<data element>;

   • <variable> is the element that reads the interface element
   • <SRinterface> is the SenderReceiver/NVData interface used as Rport
   • <data_element> is the SenderReceiver/NVData interface element you want to read

Explicit

1. Open the SWC you want to edit.

2. Enter the following code to use explicit read:

   <SRinterface>.<data element>.explicitRead(<variable>);

   • <variable> is the element that reads the interface element
   • <SRinterface> is the SenderReceiver/NVData interface used as Rport
   • <data_element> is the SenderReceiver/NVData interface element you want to read

Explicit with Status

1. Open the SWC you want to edit.

2. Declare a method-/runnable-local variable of type Std_ReturnType.

   This variable will hold the status from the explicit read procedure.

3. Enter the following code to use explicit read with status information:

   <status_variable> = <SRinterface>.<data_element>.explicitRead(<variable>);

   • <status_variable> is the variable of type Std_ReturnType that holds the returned status
   • <SRinterface> is the SenderReceiver/NVData interface used as Rport
   • <data_element> is the SenderReceiver/NVData interface element you want to read
   • <variable> is the element that reads the interface element

4. Specify the status inquiry as follows:

   if (<status_variable> != RTE_E_OK)

   {

   ... // your statement or statement block

   }

See also

Sender-Receiver Communication

Specifying a SenderReceiver or NVData Interface Prototype

RTE Access Macros – Error Codes