Thank you so much Ian Rogers for your valuable guidance.Right!! If the HMI hasn't a web server then you cannot use RTU with TCP... RTU will not run on a wireless radio setup..
The reason Modbus ASCII was introduced is so they could go through a modem..
Answer!!! Buffer... Make a wireless Modbus RTU connection at each end..
View attachment 149895
The HMI can send to the RTU server then transports wirelessly to the other.. The Micro's can buffer the data to keep the timing correct and send the same data over and over unit its refreshed... RTU has a 100ms timeout so you can maintain the connection and just update the new data as it comes in..
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