Q. How to confirm the connection with Modbus/TCP slave device.
A.
This library can communicate by Modbus/TCP communication as Modbus Master on your PC.
Most of Modbus/TCP slave devices support Ethernet communication.
Fortunately, the general PC has Ethernet port on it.
You can use this library when you connect Modbus/TCP slave device and
these Ethernet ports.
And also, you can use ModbusTCP Master Communication
Sample included this library to communicate by Modbus/TCP communication,
immediately.
Please refer the hardware manual of your PC to know more your Ethernet port.