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Modbus or MODBUS is a client/server data communications protocol in the application layer. [1] It was originally designed for use with programmable logic controllers (PLCs), [2] but has become a de facto standard communication protocol for communication between industrial electronic devices in a wide range of buses and networks.
In theatre and performance venues, RS-485 networks are used to control lighting and other systems using the DMX512 protocol. RS-485 serves as a physical layer for the AES3 digital audio interconnect. RS-485 is also used in building automation as the simple bus wiring and long cable length is ideal for joining remote devices. It may be used to ...
An RTU may be interfaced to multiple master stations and IEDs (Intelligent Electronic Devices) with different communication protocols (usually serial (RS-232, RS-485, RS-422) or Ethernet). An RTU may support standard protocols ( Modbus , IEC 60870-5 -101/103/104, DNP3 , IEC 60870-6 -ICCP, IEC 61850 etc.) to interface any third party software.
Modbus RTU or ASCII or TCP; oBIX - Open Building Information Exchange is a standard for RESTful Web Services-based interfaces to building control systems developed by OASIS. UPB - 2-way Peer to Peer Protocol; VSCP - Very Simple Control Protocol is a free protocol with main focus on building- or home-automation; xAP – Open protocol
While interfaces such as Ethernet, FireWire, and USB also send data as a serial stream, the term serial port usually denotes hardware compliant with RS-232 or a related standard, such as RS-485 or RS-422. Modern consumer personal computers (PCs) have largely replaced serial ports with higher-speed standards, primarily USB.
In its first version Modbus used a two wire cable with EIA 485 UART signals. The protocol itself is very simple with a master/slave protocol and the number of data types are limited to those understood by PLCs at the time. Nevertheless, Modbus is (with its Modbus-TCP version) still one of the most used industrial networks, mainly in the ...