These gateway models can connect existing devices to IIoT without the need to modify system architecture. The cMT-G04 can function as an Ethernet switch. By connecting the upper layer device (HMI/SCADA) and the exiting device (PLC) with its SW ports, it bridges the upper layer-to-device connection while being completely transparent to the system and ensures that the existing operation is not affected. The compact, power-saving product features the same data analysis functions as an HMI.