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Angled shot of RS485 Shield for Arduino with gold pins and colored connectors-DFRobot product sku:DFR0259 image.
Angled shot of Arduino RS485 shield for industrial communication
Angled shot of back of RS485 shield for Arduino showing abstract texture representing industrial communication protocol
Angled shot of back of Arduino RS485 Shield with industrial communication design in blue and white waves
Angled shot of front side showing Arduino RS485 shield with control knobs and indicator lights for industrial communication.

RS485 Shield for Arduino

$9.90
SKU: DFR0259
Volume Discount
  • $9.70 2+ items
  • $9.50 5+ items
  • $9.30 10+ items
The Arduino RS485 communication shield for connecting Arduino UNO-compatible boards to RS485 sensors, industrial controllers, relay modules, and long-distance serial devices. It converts Arduino UART signals to RS485 and supports both automatic and manual transmit/receive modes for flexible project integration.
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Introduction

RS485 is an industrial standard for long-distance, anti-interference, and reliable communication. The Arduino RS485 shield, specially designed for the Arduino Uno board. It converts the UART/serial protocol to the RS485 protocol. This RS485 board allows Arduino to talk to industrial devices.

In contrast to RS-422, which has a single driver circuit that 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. The equipment located along a set of RS-485 wires is interchangeably called nodes, stations, or devices.

  • Integrated a standard RS485 port, a mini RS485 port, RS485 headers
  • Provide the welding areas to make full use of the free space. And more importantly, it's convenient for your DIY design.
  • Switch between automatic mode and manual transmission mode, which expands the scope of application.
  • Besides Tx/Rx interface, there is a switch to block/disable this shield, when Arduino needs to be programmed.
  • Gold immersion PCB. Long pins on the back adapt to most Arduino controllers.

    • Arduino RS485 Shield Demo Project

    What is RS485?

    "RS-485 enables the configuration of inexpensive local networks and multidrop communications links. It offers data transmission speeds of 35 Mbit/s for distances up to 10m and 100 kbit/s up to 1200 m. Since it uses a differential balanced line over twisted pair (like RS-422), it can span relatively large distances up to 1,200 m (4,000 ft). A rule of thumb is that the speed in bit/s multiplied by the length in meters should not exceed 10^8. Thus, a 50-meter cable should not signal faster than 2 Mbit/s." From Wiki.


    Before You Buy

    This shield converts Arduino UART/Serial signals to RS485. A complete RS485 project usually also requires:

  • An Arduino UNO-compatible controller
  • At least one RS485 sensor, relay, meter, or another RS485 device
  • Twisted-pair wiring for A/B communication lines
  • A shared GND reference when required by the connected device
  • Protocol commands such as Modbus RTU, depending on the device
  • Termination or biasing considerations for longer RS485 bus wiring

    For noisy industrial environments, long outdoor wiring, or equipment protection, an isolated RS485 interface is recommended.

    Note: The screws for the terminal blocks may have slightly different cross-head styles. Both versions work perfectly with a standard Phillips head screwdriver.

    • Specification

  • Power module: +5V
  • Module size: 55mmx53mm (2.16"x2.08")
  • 16 digital IO ports (including an I2C interface)
  • 6 analog IO ports and power
  • Operation and programming mode switch
  • Automatic and manual transceiver mode switch (When in manual transceiver mode, the enable end is the 2nd digital IO port)
  • Transceiver indicating LED
  • Standard RS485 interface, mini RS485 interface, and RS485 pins
  • Welding area
  • Reset switch
  • PH2.0 sensor interface for DFRobot RS485 series sensor: URM04 Ultrasonic sensor

    • Shipping List

  • RS485 Arduino shield     x1

    • Documents

    Certifications

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    RS485 Shield for Arduino
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