Diagram of an SCU-SCP Set-Up

The diagram given below shows a simple example of an SCU-SCP connection and a series of function calls used to transfer messages and data.

SCU		SCP

LDicomNet::StartUp	Initialize the DICOM DLL. This must be done before calling any DICOM operation functions, but only needs to be called once per application.	LDicomNet::StartUp
LDicomNet::LDicomNet	Create a DICOM Network object.	LDicomNet::LDicomNet
	The SCP listens for incoming connection requests.	LDicomNet::Listen
LDicomNet::Connect	--------------------------------------------------> The SCU calls this function to connect to an SCP. This generates a call to this function on the SCP	LDicomNet::OnAccept
LDicomNet::OnConnect	<-------------------------------------------------- The SCP calls LDicomNet::CreateNet for each connection it accepts. This provides the SCP memory to store information about this specific connection. LDicomNet::Accept is called to accept the connection. This generates a call to this function on the SCU.	LDicomNet::LDicomNet LDicomNet::Accept
	DICOM Network Connection established
LDicomNet::SendAssociateRequest	--------------------------------------------------> The SCU calls this function to request a DICOM Associate connection. This generates calls to these functions on the SCP.	LDicomNet::OnReceive LDicomNet::OnReceiveAssociateRequest
LDicomNet::OnReceive LDicomNet::OnReceiveAssociateAccept or LDicomNet::OnReceive LDicomNet::OnReceiveAssociateReject	<-------------------------------------------------- The SCP calls LDicomNet::SendAssociateAccept to accept the DICOM Associate connection. This generates calls to LDicomNet::OnReceive and LDicomNet::OnReceiveAssociateAccept on the SCU. LDicomNet::SendAssociateReject is sent to reject the DICOM Associate connection. This generates calls to LDicomNet::OnReceive and LDicomNet::OnReceiveAssociateReject on the SCU.	LDicomNet::SendAssociateAccept or LDicomNet::SendAssociateReject
	DICOM Associate Connection established
LDicomNet::SendCStoreRequest	--------------------------------------------------> The SCU calls this function to request the storage of data. This generates calls to these functions on the SCP.	LDicomNet::OnReceive LDicomNet::OnReceiveData LDicomNet::OnReceiveCStoreRequest
LDicomNet::OnReceive LDicomNet::OnReceiveData LDicomNet::OnReceiveCStoreResponse	<-------------------------------------------------- The SCP calls this function to respond to the storage request. This generates calls to these functions on the SCU.	LDicomNet::SendCStoreResponse
LDicomNet::SendReleaseRequest or LDicomNet::SendAbort	--------------------------------------------------> The SCP calls LDicomNet::SendReleaseRequest to request a release from the DICOM Associate connection. This generates calls to LDicomNet::OnReceive and LDicomNet::OnReceiveReleaseRequest on the SCP. This is the preferred method of closing a connection. LDicomNet::SendAbort can also be sent to close a connection. This generates calls to LDicomNet::OnReceive and LDicomNet::OnReceiveAbort on the SCP.	LDicomNet::OnReceive LDicomNet::OnReceiveReleaseRequest or LDicomNet::OnReceive LDicomNet::OnReceiveAbort
LDicomNet::OnReceive LDicomNet::OnReceiveReleaseResponse	<-------------------------------------------------- The SCP calls this function to respond to the release request. This generates calls to the following functions on the SCU.	LDicomNet::SendReleaseResponse
LDicomNet::Close	---------------------------------------------------> The SCU calls this function to close the DICOM Associate connection. This generates a call to this function on the SCP.	LDicomNet::OnClose
LDicomNet::ShutDown	When the DICOM DLL is no longer needed, call this function to shut down the DLL and free all associated memory. This function should be called once for every call to LDicomNet::StartUp.	LDicomNet::ShutDown