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See rs485 example of two arduinos communicating over re 485 here.

Arduino rs485 beispiel. In half duplex mode it has a data transfer rate of 2. Check out the detailed tutorial on rs 485 modbus serial communication with arduino as master. Rs485 library for arduino enables sending and receiving data using the rs485 standard with rs485 shields like the mkr 485 shield.

Its possible to use an arduino as slave and with some restrictions also as master in modbus applications but a rs485 interface is needed. There is also a usb to rs485 module top right for use on pc s. Connect correctly the communication ports of rs 485 between both plcs.

See on rs 485 communication. How to install simplecomm libraries. Next we will proceed to explain how this example works.

Simplecomm libraries installed on your arduino ide. This shield the perfect choice for such kind of applications. See the example rs485 network diagram scroll down.

The network has 120 ohm termination resistors at each end. It can be used between 2 or more arduinos and to various i o devices that support it. Rs 485 example communication and how to use our libraries.

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. More details about rs 485 modules here. The example here shows two arduinos connected with low cost rs485 electronic bricks or breakout boards that use a max485 chip.

This library supports the maxim integrated max3157 and equivalent chipsets.

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