For Modbus TCP/IP in Unity go to Modbustools.com and purchase the client. No license restrictions. License number is entered in script. Just include the DLL and you’re on your way. I used Unity for an HMI talking to a Do-More plc from Automation Direct. The client only cost about 200 dollars. Works great!! HMI screens turned out sweet. Made the HMI communication multithreaded for the Modbus client,which is like having two PCs asking for updates one after the other, and the HMI was the fastest responding I have ever seen in 40 years in the field. Good luck!
For Modbus TCP/IP in Unity go to Modbustools.com and purchase the client. No license restrictions. License number is entered in script. Just include the DLL and you’re on your way. I used Unity for an HMI talking to a Do-More plc from Automation Direct. The client only cost about 200 dollars. Works great!! HMI screens turned out sweet. Made the HMI communication multithreaded for the Modbus client,which is like having two PCs asking for updates one after the other, and the HMI was the fastest responding I have ever seen in 40 years in the field. Good luck!