Very easy for RS422/RS485
Simple, easy, work well.
Tom Green
DFRobot
RS485 Shield For Arduino
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Arduino RS485 is an industrial standard for long distance, anti-interferrence and reliable communication. So we create this RS485 Arduino shield, espe...
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Arduino RS485 is an industrial standard for long distance, anti-interferrence and reliable communication. So we create this RS485 Arduino shield, especially designed for the Arduino controller board. It converts UART/Serial protocol to RS485 protocol. This RS485 board allows Arduino access to industrial standard protocol easily.
In contrast to RS-422, which has a single 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. The equipment located along a set of RS-485 wires are 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 expand 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.
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 distandances up to 10 m 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 108. Thus a 50 meter cable should not signal faster than 2 Mbit/s." From Wiki.
SPECIFICATIONS
- Power module: +5V
- Module size: 55mmx53mm(2.16"x2.08")
- 16 digital IO port (including a I2C interface)
- 6 analog IO port 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
DOCUMENTS
SHIPPING LIST
- RS485 arduino shield x1
Jargon buster
Plain-language definitions for the technical terms used above.
- Headers
- Rows of connector contacts on a fixed pitch (commonly 2.54 mm) used to link a board to a breadboard, jumper wires, or another board. They come as male pin headers and female socket headers; when a module ships with pre-soldered headers it can be used straight away, whereas bare pads require soldering the pins yourself.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- PCB
- A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
- RS485
- RS485 is a robust differential serial communication standard often used in factories, farms and buildings where cables may be long or electrically noisy, and it can link many devices on a single pair of wires. When a product lists RS485, it can communicate with industrial sensors, meters and control equipment over longer distances than typical hobby serial wiring.
- RX
- RX means receive, usually showing data being received by the board. An RX indicator LED can help with troubleshooting USB or serial communication.
- Shield
- An add-on board that plugs into a main controller board to give it extra features such as sensing, motor control or communication. Knowing a product supports shields helps you judge whether it can connect neatly into an existing maker-board setup.
- TX
- TX means transmit, usually showing data being sent from the board. A TX indicator LED can help you see when the board is communicating or uploading code.
- UART
- UART is a simple asynchronous serial interface that sends data over separate transmit and receive wires, usually labelled TX and RX, with both ends set to the same baud rate. It is a common way for microcontrollers and other serial devices to exchange data.
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