EIA-485 is used:
- In an extensive range of computer and automation systems. In a
computer system, SCSI-2 and SCSI-3 may use this specification to
implement the physical layer for data transmission between a controller and a disk drive.
- For low-speed data communications in commercial aircraft cabins
vehicle bus where it requires minimal wiring, and can share the wiring
among several seats, resulting in reduced weight.
- As the physical layer underlying many standard and proprietary automation protocols used to implement Industrial Control Systems,
including the most common versions of Modbus and Profibus.
- In programmable logic controllers and on factory floors. Since
it is differential, it resists electromagnetic interference from motors
and welding equipment.
- In theatre and performance venues to control sound systems and
lighting. The EIA-485 link is typically implemented over standard XLR
cables more commonly used for microphones, and so can be run between
stage and control desk without laying special cables. Theatrical and
disco lighting is controlled with the DMX protocol.
- EIA-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 control video surveillance systems or to interconnect security control panels and devices such as access control card readers.
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