RS-485: A Serial Communication Standard

RS-485 is a standard for serial communication that uses a balanced signal to transmit data. This makes it more resistant to noise than other serial standards, such as RS-232. RS-485 can also support multiple devices on the same bus, up to a maximum of 32.

Here are some of the key features of RS-485:

  • Balanced signal: RS-485 uses a balanced signal, which means that the two wires used to transmit data carry the same signal, but with opposite polarity. This makes the signal more resistant to noise.
  • Multipoint: RS-485 can support multiple devices on the same bus. This means that a single RS-485 cable can be used to connect multiple devices, such as sensors, actuators, and controllers.
  • Long distances: RS-485 can support long distances, up to 1,200 meters. This makes it a good choice for applications where the devices are spread out over a large area.
  • High speed: RS-485 can support data rates up to 10 Mbps. This makes it a good choice for applications where high-speed data transfer is required.

RS-485 is a popular standard for a variety of applications, including:

  • Industrial automation
  • Building automation
  • Medical equipment
  • Networked sensors
  • Distributed control systems

If you are looking for a serial communication standard that is resistant to noise, supports multiple devices, and can support long distances, then RS-485 is a good choice.


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