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Figure 1-2 shows the relationship between multiple products (slaves) and a Modbus master (assuming RS-485).

Figure 1-3 shows the relationship between multiple products (slaves) and multiple Modbus masters (assuming RS-485 in the example) with one of those products being µC/Modbus-M. You will note that only one master can be present on each RS-485 network.

Figure 1-4 shows the relationship between multiple products (slaves) and multiple Modbus masters (assuming RS-232C in the example). As you can see, with RS-232C, each master needs to have a direct connection to each slave. µC/Modbus supports this topology since each product can have multiple communication channels. Although RS?232C requires more point-to-point connections, it offers the benefit of higher throughput since communications can occur concurrently instead of sequentially.

Modbus allows you to read or write integer, floating-point (assuming the Daniels Extensions) and discrete values from/to your target system. µC/Modbus can read or write from/to:

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