I am trying to establish communication between HMI and PLC by using the Raspberry Pi. The existing setup between HMI directs to PLC via serial communication and protocol on Modbus RTU.
I am trying to put Raspberry Pi between HMI and PLC. Raspberry pi will be master serial to pull data from PLC via Serial Modbus RTU and be slave serial for HMI. HMI will be master to pull data from raspberry pi.
How I can achieve this? I am trying this to get some extra data from plc for monitoring purpose and didn't disturb the existing system.