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Its possible to use an arduino as slave and with some restrictions also as master in modbus applications but a rs485 interface is needed.
Arduino rs485 beispiel. See on rs 485 communication. Check out the detailed tutorial on rs 485 modbus serial communication with arduino as master. Rs485 is a physical connection standard for serial data transfer.
There is also a usb to rs485 module top right for use on pc s. Our rs422 rs485 serial shield is a fully galvanic isolated serial communication hat designed for use with the arduino uno and other compatible boards like arduino 101 stm nucleo. It can be used between 2 or more arduinos and to various i o devices that support it.
This library supports the maxim integrated max3157 and equivalent chipsets. How to install simplecomm libraries. The example here shows two arduinos connected with low cost rs485 electronic bricks or breakout boards that use a max485 chip.
Simplecomm libraries installed on your arduino ide. More details about rs 485 modules here. For using rs 485 in arduino a module called 5v max485 ttl to rs485 which is based on maxim max485 ic is needed as it allows serial communication over long distance of 1200 meters and it is bidirectional.
This shield the perfect choice for such kind of applications. The network has 120 ohm termination resistors at each end. Rs485 library for arduino enables sending and receiving data using the rs485 standard with rs485 shields like the mkr 485 shield.
Next we will proceed to explain how this example works. In half duplex mode it has a data transfer rate of 2. Rs 485 example communication and how to use our libraries.
See rs485 example of two arduinos communicating over re 485 here.
Source : pinterest.com
