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.