Figure 45. Modbus RTU to Modbus TCP
When users use the Modbus protocol conversion, there are two different conditions: Ethernet device works as
Modbus master or serial device works as Modbus master, we will introduce the setting of these two conditions in
the following chapter.
We will test this feature with Modbus Poll and Modbus slave tool which can be downloaded by Google or
other search engines. You can download the Modbus tool by yourselves.
5.1.1. Ethernet master with serial slave
In this condition, USR-TCP232-30x should work as TCP server and local port can’t be 0 and 80 etc. that maybe
occupied by the other functions.
Figure 46. Ethernet master with serial slave
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