IEC 101 protocol was designed in the early 90ies and still widely used in the energy sector.
The protocol was originally designed for circuit switched communication and is based on Synchronous polling.
With the advent of packet-switched data, IEC 104 protocol emerged which harnesses both synchronous polls, asynchronous events along with advanced acknowledgement mechanisms.
Today most energy SCADA systems use IEC 104 protocol. Maestro IEC 101 – IEC 104 package helps seamlessly bridge an IEC 101 device with an IEC 104 SCADA system.
It supports both balanced and un-balanced IEC 104 mode and multi-master IEC 104 SCADA support.