Title: 32 Pumper modbuss teknisk data.pdf.pdf
3. CIU 260 is now ready for a client, for example the SCADA system, to establish a socket connection and begin TCP/IP data exchange. When a client connects CIU 260, the connection state will change to "Connected", and the cellular connection status LED1 indicates when data transfer takes place. See section 5.5 Status LEDs. When no data is being transferred, the connection states "Attached", "Context active" and "Connected".All show the same LED1 status (short pulse).A client, for example SCADA, establishes connection to CIU 260 by specifying the IP address and the TCP port 502. Data transfer is always initiated from the client in the form of a Modbus TCP telegram embedded in a TCP/IP frame and directed to TCP port 502. To the client software, the connection to CIU 260 is completely transparent.