Hello guys,
I have an Ethernet Lan Shield W5100 and an Arduino uno. I want to communicate with some PLC devices using the Modbus protocol. I don't know if it's possible with the ethernet shield? What protocol can we use with this shield?
Could someone help me please?
Thank you beforehand
What sort of voltage levels is your PLC expecting?
The Modbus project I worked on used a RS485 bus.
I was under the impression the Ethernet shield used Ethernet communication. I don't know much about Ethernet but I don't think it uses RS485 compatible levels.
If you tell us more about what sort of protocol (both physical and data), then someone might be able to provide a better answer to your question.
The Modbus project I worked on required even parity. I'm not sure how one configures the serial output of an Arduino to send even parity (if needed).