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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 ...
MECHATROLINK – open protocol originally developed by Yaskawa, supported by the MMA; MelsecNet, and MelsecNet II, /B, and /H, supported by Mitsubishi Electric. Modbus PEMEX; Modbus Plus; Modbus RTU or ASCII or TCP; MPI – Multi Point Interface; OSGP – The Open Smart Grid Protocol, a widely use protocol for smart grid devices built on ISO ...
Industrial Ethernet (IE) is the use of Ethernet in an industrial environment with protocols that provide determinism and real-time control. [1] Protocols for industrial Ethernet include EtherCAT , EtherNet/IP , PROFINET , POWERLINK , SERCOS III , CC-Link IE , and Modbus TCP .
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 ...
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.
The medium consists of a duplicated shielded twisted pair cable, which runs in the UIC cables between the vehicles. The connector between the vehicles is the 18-pole UIC connector. Since connectors are exposed and can oxidize, a current pulse is applied at connection establishment to evaporate the oxide layer, called fritting. The standard ...
The network runs on a 4-twisted-pair cable of 100Ω 100 MHz CAT5E [permanent dead link ] [1] or a flat cable with RS485 serial port, usually with a RJ-12 connector. A daisy-chain serial network topology is strongly recommended with no stubs. The recommended [1] cable colour-coding is: Green/White pair = paralleled for GND