Tunnel – An advanced example for reading 2 serial devices using a single modem/SIM and simultaneously using GPRS connection and GSM calls. There is additional serial tunnelling when there are no GSM/GPRS connections
Scenario details: In this scenario you have a modem with 2 serial ports. One serial port is connected to an energy meter; the other is connected to a PLC When there is no GPRS connection with the modem and a GSM call has not been established by the operator, the modem acts as a serial tunnel. This […]
Tunnel – A basic example for meter reading with simultaneous GPRS connections and GSM calls
Scenario details: The intention is to take electrical meter readings periodically, every 10 minutes. By obtaining readings so frequently you will access the meter via GPRS instead of with GSM calls in order to save costs At the same time, the energy operator (Endesa, Iberdrola, etc.) will obtain a reading once a day with a conventional GSM call […]