when the port is closed?

In the manual about fixedresource, it says:
When the flowitem is released, the FixedResource calls the Sendto function. Like the Pull from Port function, this function returns a port number. The FixedResource then opens that port. If the port number is 0, then it will open all of its output ports. Once the ports are opened, the FixedResource waits until a downstream object becomes ready to receive the flowitem.

Then, the flowitem will go into the downstream object.

what I want to know is will the state of the port be changed automaticly? For example, will the outport be closed when the flowitem have exited?

The answer is yes, but it depends on how the fixed resource is programmed. On a processor it is closed, on the queue it will stay open if there products in the queue that can go out.

If you switch "Show Connections" on you will see either red or green boxes at the end of the connections. Red means closed and green means open.

Steven