There are two ways to connect the Infinity Evo Class B Woltmann Meter to the retrofit IoT Devices: - Infinity Evo Class B Woltmann Meter to Retrofit IoT Device: - Infinity Evo Class B Woltmann Meter - Visiosoft VisioUtil Device: please see the connection diagram here - Infinity Evo Class B Woltmann Meter - Telbit SmartWater Device: please see the connection diagram here - Elster PR7 to Retrofit IoT Device: - Elster PR7 - Visiosoft VisioUtil Device: please see the connection diagram here - Elster PR7 - Telbit SmartWater Device: please see the connection diagram here