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Check out the detailed tutorial on rs 485 modbus serial communication with arduino as master.
Arduino rs485 beispiel. Connect the other end of the power wire red wire from the arduino mega to the vcc power pin of the rs485 module picture 1 place a jumper between the de and re pins of the rs485 module picture 2 connect the other end of the tx wire green wire from the arduino mega to the di driver input pin of the rs485 module picture 3. The network has 120 ohm termination resistors at each end. Rs 485 example communication and how to use our libraries.
Its possible to use an arduino as slave and with some restrictions also as master in modbus applications but a rs485 interface is needed. 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. See on rs 485 communication.
Connect correctly the communication ports of rs 485 between both plcs. This library supports the maxim integrated max3157 and equivalent chipsets. See the example rs485 network diagram scroll down.
In half duplex mode it has a data transfer rate of 2. Rs485 library for arduino enables sending and receiving data using the rs485 standard with rs485 shields like the mkr 485 shield. 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. More details about rs 485 modules here. How to install simplecomm libraries.
It can be used between 2 or more arduinos and to various i o devices that support it. Next we will proceed to explain how this example works. Simplecomm libraries installed on your arduino ide.
The example here shows two arduinos connected with low cost rs485 electronic bricks or breakout boards that use a max485 chip.
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