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GW-7552-B / GW-7552-M PROFIBUS/MODBUS GATEWAY User Manual
(Version 1.60, May/2017)
PAGE: 22
GW-7552-M
Figure 20 the input data of Profibus master device receive from the GW-7552-B
/ GW-7552-M
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 21
.