Which serial communication protocol is best for long distance?
There are many different types of serial communication protocols like I2C and SPI which can be easily implemented with Arduino and today we are going to look at another most commonly used protocol called RS485 which is very commonly used in high noise industrial environments to transfer the data over a long distance.
How fast is Arduino serial communication?
Sets the speed (baud rate) for the serial communication. Supported baud rates are 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 31250, 38400, 57600, and 115200.
How far can UART?
With appropriate line drivers, a UART can work over long distances: from 15 meters (m) for the RS-232 serial data bus to 1000 m for RS-485 or RS-422 interfaces.
What serial communication does Arduino use?
Serial is used for communication between the Arduino board and a computer or other devices. All Arduino boards have at least one serial port (also known as a UART or USART): Serial. It communicates on digital pins 0 (RX) and 1 (TX) as well as with the computer via USB.
What is the fastest communication protocol?
Advantages of using SPI
- The protocol is simple as there is no complicated slave addressing system like I2C.
- It is the fastest protocol compared to UART and I2C.
- No start and stop bits unlike UART which means data can be transmitted continuously without interruption.
Which interface is used for long distance communication?
The RS-485 has been used since the late 90s in a variety of industrial systems where data needs to be transmitted over long distances, in the presence of electromagnetic interference. As a rule, the RS-485 interface is used together with specialized protocols, such as ModBus or DMX512.
Why is baud rate 9600?
In the serial port context, “9600 baud” means that the serial port is capable of transferring a maximum of 9600 bits per second. The higher the baud rate, the more sensitive the cable becomes to the quality of installation, due to how much of the wire is untwisted around each device.
How reliable is UART?
So, based on this simplified analysis, eight-data-bit UART communication should be reliable as long as the difference between transmitter baud rate and receiver baud rate is less than 3.75%.
How to create long-distance serial communication between…?
In order to connect two Arduino boards via the RS-485 interface, we need a special module. Typically, such modules use the popular MAX485 chip. Project schematic. Cable connection with a length of several meters. Note: In the figure above, wires A and B are straight. This will suffice if the distance is small.
Which is better RS485 or Arduino serial communication?
Signal High and Lows are measured against the GND level so shifting the GND level will have a disastrous effect on the data transfer. On the other hand, RS485 is more industry-based communication which is developed for a network of multiple devices that can be used over long distances and at greater speeds too.
Which is the serial communication protocol for Arduino?
There are many different types of serial communication protocols like I2C and SPI which can be easily implemented with Arduino and today we are going to look at another most commonly used protocol called RS485 which is very commonly used in high noise industrial environments to transfer the data over a long distance.
Is there a way to communicate between two Arduinos?
The range of this module can reach up to 1 km depending on the settings and the antenna used. These modules usually come with some factory settings, so that we can communicate between two HC-12 modules.