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RS-485, also known as TIA-485(-A) or EIA-485, is a standard, originally introduced in 1983, defining the electrical characteristics of drivers and receivers for use in serial communications systems. Electrical signaling is balanced , and multipoint systems are supported.
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.
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 ...
MIL-STD-1553B does not specify the length of the cable. However, the maximum length of cable is directly related to the gauge of the cable conductor and time delay of the transmitted signal. A smaller conductor attenuates the signal more than a larger conductor. Typical propagation delay for a 1553B cable is 1.6 nanoseconds per foot.
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
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 ...
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Ability to have more than two nodes on link, which was possible with RS-485 but not with RS-232; Potential to use peer-to-peer architectures as opposed to client–server ones; Better interoperability; Difficulties of using industrial Ethernet include: Migrating existing systems to a new protocol; Real-time performance may suffer for protocols ...