M-Bus ("Meter-Bus") is a new European standard for remote reading of heatmeters. It is usable for many types of consumption meters as well as for various sensors and actuators. Up to 250 devices can be connected to a Master over a single line at low cost.
SML (Smart Message Language) is a communication protocol for applications in the area of data acquisition and parametrisation of devices. User data are packed into SML-messages, which are again combined to SML files for transmission. SML-files are independent of the transmission method. They can be sent via e-mail, modem-connection or IP-Telemetry.