TCP_WRITE_STATE (ENUM) ¶ TYPE TCP_WRITE_STATE : InOut: Name Initial IDLE 0 SENDING DONE

HoTo (GVL) ¶ Attributes: qualified_only InOut: Name Type iDummy INT

Function Blocks ¶ TCP TCP_Client (FunctionBlock) TCP_Connection (FunctionBlock) IPAddress (Property) TCP_Read (FunctionBlock) TCP_ReadBuffer (FunctionBlock) TCP_Server (FunctionBlock) TCP_Write (FunctionBlock) TCP_WriteBuffer (FunctionBlock) UDP UDP_Peer (FunctionBlock) UDP_Receive (FunctionBlock) UDP_ReceiveBuffer (FunctionBlock) UDP_Send (FunctionBlock) UDP_SendBuffer (FunctionBlock)

TCP ¶ TCP_Client (FunctionBlock) TCP_Connection (FunctionBlock) IPAddress (Property) TCP_Read (FunctionBlock) TCP_ReadBuffer (FunctionBlock) TCP_Server (FunctionBlock) TCP_Write (FunctionBlock) TCP_WriteBuffer (FunctionBlock)

TCP_Connection (FB) ¶ FUNCTION_BLOCK TCP_Connection EXTENDS CBM.LTrig The next free connection is determined by handle exchange and set to active. As long as xActive is TRUE the handle of the connection is valid. If xActiveis FALSE the handle of the connection is invalid. hConnection can be used as input hConnection for function blocks TCP_Write , TCP_WriteBuffer , TCP_Read and TCP_ReadBuffer . InOut: Scope Name Type Comment Inherited from Input xEnable BOOL TRUE : Action starts FALSE : Action stops, outputs xDone , xBusy , xError are resetted LTrig Output xDone BOOL TRUE : Action successfully completed LTrig xBusy BOOL TRUE : Function block active LTrig xError BOOL TRUE : Error occurred, function block aborts action FALSE : No error LTrig Input hServer CAA.HANDLE Output eError ERROR xActive BOOL hConnection CAA.HANDLE Properties: IPAddress Structure: IPAddress (Property)

TCP_Read (FB) ¶ FUNCTION_BLOCK TCP_Read EXTENDS CBM.LTrig This function block serves to read data from the previously established connection given in hConnection . As long as xEnable is TRUE the handle of the connection is valid. The pointer pData specifies the memory area to write the read data to. szSize defines the max number of bytes to read. When the data was read successfully, xReady is set to TRUE and szCount indicates the actually read number of bytes. InOut: Scope Name Type Comment Inherited from Input xEnable BOOL TRUE : Action starts FALSE : Action stops, outputs xDone , xBusy , xError are resetted LTrig Output xDone BOOL TRUE : Action successfully completed LTrig xBusy BOOL TRUE : Function block active LTrig xError BOOL TRUE : Error occurred, function block aborts action FALSE : No error LTrig Input hConnection CAA.HANDLE szSize CAA.SIZE pData CAA.PVOID Output eError ERROR xReady BOOL szCount CAA.SIZE

TCP_ReadBuffer (FB) ¶ FUNCTION_BLOCK TCP_ReadBuffer EXTENDS CBM.LTrig Like TCP_Read this function block serves to read data from the previously established connection given in hConnection . As long as xEnable is TRUE the handle of the connection is valid. The function block returns the handle of the buffer containing the data. If xReady is TRUE , data has been read successfully and the handle of the buffer is valid. The buffer is passed on and not copied like at TCP_Read . InOut: Scope Name Type Comment Inherited from Input xEnable BOOL TRUE : Action starts FALSE : Action stops, outputs xDone , xBusy , xError are resetted LTrig Output xDone BOOL TRUE : Action successfully completed LTrig xBusy BOOL TRUE : Function block active LTrig xError BOOL TRUE : Error occurred, function block aborts action FALSE : No error LTrig Input hConnection CAA.HANDLE Output eError ERROR xReady BOOL hBuffer CAA.HANDLE

Decode (FUN) ¶ FUNCTION Decode : BOOL Function decodes “Source” (ARRAY OF BYTE) into “Destination” (ARRAY OF DWORD), meaning 4 BYTEs are decoded into 1 DWORD. Assumes “uiNumberOfBytes” is a multiple of 4, whereas if it is not “FALSE” will be returned. InOut: Scope Name Type Comment Return Decode BOOL function returns “TRUE” if decoding succeded Input pSource POINTER TO ARRAY [0..0] OF BYTE address of source memory pDestination POINTER TO ARRAY [0..0] OF DWORD address of destination memory uiNumberOfBytes UINT number of bytes to decode

Encode (FUN) ¶ FUNCTION Encode : BOOL Function encodes “Source” (ARRAY OF DWORD) into “Destination” (ARRAY OF BYTE), meaning 1 DWORD is split up into 4 BYTEs. Assumes “uiNumberOfBytes” is a multiple of 4, whereas if it is not “FALSE” is returned. InOut: Scope Name Type Comment Return Encode BOOL function returns “TRUE” if encoding succeeded Input pSource POINTER TO ARRAY [0..0] OF DWORD address of source memory pDestination POINTER TO ARRAY [0..0] OF BYTE address of destination memory uiNumberOfBytes UINT number of bytes to encode

MemFill (FUN) ¶ FUNCTION MemFill : BOOL Function fills all bytes of a memory block with the value “byFillValue”. In case of success, the function will return “TRUE”. Only if “MemoryBlock” is set to “0”, the initialization will not be carried out and the function will return “FALSE”. InOut: Scope Name Type Comment Return MemFill BOOL function returns “TRUE” if filling succeeded Input pMemoryBlock POINTER TO BYTE address of memory block uiLength UINT length of memory block in byte byFillValue BYTE Fill value for the memory block