2 modbus data exchange – B&B Electronics GW-7553 - Manual User Manual

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GW-7553 PROFIBUS/Modbus TCP Gateway User Manual (Version 1.00, Dec/2008) PAGE: 19

Figure 16 The input data of PROFIBUS Master device receive from the GW-7553

3.2 Modbus data exchange

Modbus protocol belongs to Master-Slave communication and it uses query and
response message to arrive at data exchange and device control, as shown in
figure 17.

Figure 17 Data exchange between the Modbus devices and the GW-7553