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the serial port RTU device is as master, the Modbus Gateway work in TCP Client, and
the destination IP fill the IP of the computer that Modbus TCP software in, the destination
port usually is 502.
7.2 Storage Modbus Gateway
The new generation of ZLAN5143 (end with 3 all storage) is Modbus register storage
type gateway, compared with the ordinary ZLAN5142 (end with 2 or 0 all non-storage),
ZLAN5143 can store the content of reading register inside the gateway, so the Modbus
TCP can greatly improve the query speed, support for performance more superior when
multiple host access.
Figure 46 Storage Modbus Gateway Work Mode
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