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Scenario details:
- We need to read an energy meter, periodically, every 10 minutes through a 3G-RS232 gateway. We will call it “Real-Time” connection
- In parallel, an energy operator (like Endesa, Iberdrola, …) once a day will establish a IP connection (i.e., a 3G-RS232 gateway AS WELL, NOT A GSM CALL) to carry out the daily meter reading
- Operator’s IP connection should be of TOP PRIORITY. That is to say, when receiving a IP connection from the energy operator, the modem should “freeze” the ‘Real Time” connection to give way to operator’s readings. “Real Time” communication should be re-etablished after the operator’s IP connection is ended
Config.txt configuration file:
| Configuration | Observations |
| COMM_baudrate: 9600 COMM_bitsperchar: 8 COMM_autorts: off COMM_autocts: off COMM_stopbits: 1 COMM_parity: none GPRS_apn: internetestatico.movistar.es GPRS_login: MOVISTAR GPRS_password: MOVISTAR GPRS_timeout: 0 MTX_mode: server MTX_model: 199801422 MTX_ping: 35 MTX_pingIP: 8.8.8.8 MTX_port: 20010 MTX_portb: 20011 Firewall_enabled: off |
Serial port baud rate Number of bits No flow control No flow control 1 stop bit No parity GPRS APN GPRS Login GPRS Password Modem is always GPRS connected MTX server mode MTX terminal model Ping every 35 minutes without comms IP address to ping TCP port for real time reading ETCP port for Energy Operator Accept incoming connections from any IP |
Details:
- RS232 port of MTX-Java-T modem is used to establish a 3G-RS232 transparent gateway
- 2 simultaneous 3G-RS232 gateways are created. 1 in TCP20010 port, other in TCP 20011 port
- Both gateways can’t run simultaneously. When the operator establishes connects with 20011, communications with 20010 are suspended. Then, only the operator has access to the meter
- When the operator connection ends in 20011, communications with 20010 are resumed
Enter the “ethernet” or “modem” connection type:
For an ethernet configuration, make sure the IP parameters are compatible with server access according to the concentrator local network configuration. For an ethernet connection, the configuration must be compatible with the concentrator’s local network topology so that it can access the servers. This configuration is done from the “Networks” configuration page (see section 3.2.2.3: “Networks”).
For a modem connection, the modem configuration must be correct before a connection can be set up. This configuration is done from the “Modem” configuration page (see section 3.2.2.4: “Modem”).
The parameters for the servers to be configured are at least the following:
Therefore the following fields need to be configured: “Interface”, “Type”, “Server type”, “Address”, “Port”, “Login” and “Password”.
The other fields can be left at the default values subject to the directories having been properly created beforehand. See section 3.1.2: “Configuration files” for more details.
Wait. The concentrator will reboot using its factory configuration.
