The “Geysitech (Bayern-Hessen) Protocol” ( “Geysitech Protokoll” / “Bayern-Hessen Datenprotokoll” ) for climate telemetry systems, used by the IT infrastructure of the german trade and industrial inspectorates ( “Gewerbeaufsichtsamt” ) in Germany.
HW group "HWg-PWR: M-Bus IP energy meter (SNMP, WEB)" - “M-Bus or S0 pulse counter? The M-Bus is a standard in energy metering. As opposed to pulse counters (S0), it works with absolute values (acquired data can be used as an argument against the utility bill). At the same time allows working with additional values (quantities), such as voltage, current, flow, drift, etc.”.
NettedAutomation GmbH - “The Net is the Automation. We bring people, systems and devices together” - “IEC61850Li® - Lite implementations. The free evaluation DLL for an IEC 61850 (IEC 61400-25) as a Starter Kit for Client/Server and Publisher/Subscriber is now available”.
SISCO, Inc "MMS-EASE Lite" - “A source code product for embedding the IEC 61850 protocols in Intelligent Electronic Devices (IEDs) such as RTUs, reclosers, PLCs, meters and other resource constrained systems”.
EN.Wikipedia "DNP3", DE.Wikipedia "DNP3" ( Distributed Network Protocol ) - “A set of communications protocols used between components in process automation systems. It was developed for communications between various types of data acquisition and control equipment. It plays a crucial role in SCADA systems, where it is used by SCADA Master Stations (aka Control Centers), Remote Terminal Units (RTUs), and Intelligent Electronic Devices (IEDs)”.
Standad UARTs of microcontrollers are not suitable for implementation of PROFIBUS, MODBUS or other high-speed serial communication ( as a standard UART can't be configured to run with 12 Mhz bus clock speed ). You need specially designed devices ( on the microcontroller chip ) for such.