Siemens S7
S7 is a Siemens proprietary protocol made to connect Siemens S7 programmable logic controllers (PLCs) programming, data exchange and access purposes.
Profibus
PROFIBUS (Process Field Bus) is a standard fieldbus communication protocol for automation technology openly published as part of IEC61158.
UDP/IP
UDP (User Datagram Protocol) is a connectionless internet protocol (IP). It provides unreliable but a fast and simple service well suited  for many real-time applications.
TCP/IP
TCP (Transmission Control Protocol) is a connection-oriented internet protocol (IP). It is the basic communication protocol of the Internet.
RS-485
RS-485 is a differential communication protocol that can transfer data at rates up to 10 Mbit/s over cables up to 1200 m  in length. Up to 32 devices are supported.
