There are a lot of different variants of RS-485 shields for Arduino:
- https://www.waveshare.com/wiki/RS485_CAN_Shield
- https://www.tinyosshop.com/arduino-rs232-rs485-shield
- https://www.dfrobot.com/wiki/index.php/IO_Expansion_Shield_For_Arduino(V5)_(SKU:_DFR0088)
- https://www.hwhardsoft.de/english/projects/rs485-arduino/
RS485/CAN Arduino Shield
https://www.waveshare.com/wiki/RS485_CAN_Shield
RS232/RS485 Arduino Shield
https://www.tinyosshop.com/arduino-rs232-rs485-shield
IO_Expansion_Shield_For_Arduino(V5)
RS422/485 Arduino Shield
https://www.hwhardsoft.de/english/projects/rs485-arduino/
Example of using the shield with Modbus RTU termo sensor.
Example, how to work with not expensive Arduino RS485 Shield ordered from Aliexpress.
