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632 ScadaWorks Technical Reference Manual User's Guide Parameters sock: DINT Socket used for listening for a new connection and monitoring an established connection. Return Values rslt: DINT -2 invalid SOCK. -1 = idle (no client connected). 0 = connected (client just connected). 1 = active (client still connected). Remarks ST Example SockListen should be called and the status checked before every read and write of the socket. SockListen will handle link status changes every time it is called. SockListenResult := SockListen( Socket1Handle ); (* did we get a connection *) if SockListenResult >= 0 then (* go on and read or write from the connection *) end_if; Write Data To a Socket -- SockWrite() Type C Function Function Write data to an active connection. FBD Syntax DINT SockWrite( DINT SOCK, STRING DATA, DINT SIZE ) Parameters sock: DINT connection to write data to. data: STRING data bytes to write size: DINT number of data bytes to write. Return Values rslt: DINT -2 = invalid SIZE (must be <= 255) or invalid SOCK. -1 = no connection established. 0 = success (data written). 1 = blocked (retry call later until complete).
