Title: 32 Pumper modbuss teknisk data.pdf.pdf
1. CIU 260 locates the APN service. The connection state changes from "Detached" to "Attached".2. CIU 260 attempts to connect to the APN it has been given and requests an IP address. The base station looks through its record of legal SIM cards and finds the IP address, the address associated with this SIM card, to assign to CIU 260. After CIU 260 has got the IP address, the connection state changes to "Context active".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".