What is the range of data transmission in RS485?
4,000 feet
RS485 is popular for inexpensive local networks, multidrop communication links and long haul data transfer over distances of up to 4,000 feet. The use of a balanced line means RS485 has excellent noise rejection and is ideal for industrial and commercial applications.
What differential voltages are used in RS485?
The RS-485 Transmitter The standard RS-485 Tx is a driver with differential outputs that is specified to deliver at least a 1.5V differential voltage into a 54Ω differential load. The 54Ω load is derived from the maximum allowed two 120Ω termination resistors in parallel with 32, 1 UL receivers.
What is the point to point communication of RS-485?
What is RS-485? RS-485 is an industrial specification that defines the electrical interface and physical layer for point-to-point communication of electrical devices. The RS-485 standard allows for long cabling distances in electrically noisy environments and can support multiple devices on the same bus.
What kind of voltage does a RS-485 encoder use?
This allows designers to create RS-485 systems using their existing board voltages. With that being said, it is important to verify the product specifications to ensure that the device supports the full voltage range of the standard. For example, CUI Devices’ RS-485 encoders use 3.3 V on the board, so they use an RS-485 3.3 V transmitter.
What’s the difference between RS-422 and RS-485?
In contrast to RS-422, which has a driver circuit which cannot be switched off, RS-485 drivers use three-state logic allowing individual transmitters to be deactivated. This allows RS-485 to implement linear bus topologies using only two wires.
Where does the RS-485 serial interface take place?
RS-485 is well-contained within the first three layers of the OSI model with the actual implementation of the bus being characterized within the application layer. This layer covers the addresses or command sets used by the devices as well as the interpretation of the data.