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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 ...
J1708 – RS-485 based SAE specification used in commercial vehicles, agriculture, and heavy equipment. J1939 and ISO11783 – an adaptation of CAN for agricultural and commercial vehicles Keyword Protocol 2000 (KWP2000) – a protocol for automotive diagnostic devices (runs either on a serial line or over CAN)
Protocol information; Type of network: Open fieldbus and industrial Ethernet: Physical media: RS485, optical fiber, Ethernet (gigabit & 100Mbit) Network topology: bus, star, ring, line (depending on type)
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 ...
The Manchester decoder uses a phase/quadrature demodulation (not RS-485, that operates with zero-crossings) which allows to span 750 m under worst-case conditions, especially when only the two extremity vehicles are equipped, as is the case with multiple traction for freight trains. No repeaters are foreseen since vehicles in between can have ...
Distributed Network Protocol 3 (DNP3) is a set of communications protocols used between components in process automation systems. Its main use is in utilities such as electric and water companies. Usage in other industries is not common. It was developed for communications between various types of data acquisition and control equipment.
IEC 61850 is an international standard defining communication protocols for intelligent electronic devices at electrical substations.It is a part of the International Electrotechnical Commission's (IEC) Technical Committee 57 reference architecture for electric power systems. [1]