Handa HD RJ45 Nectwork Connector is optional and is only used when a network cable is required to connect the network, so that customers can connect the network cable from the outside of the inverter or battery directly without having to open the wiring box. Dissemble the socket part of HD RJ45 connector,install the socket on the inverter or battery, universal PCS, then connect the socket and the network port of the device with a network cable. Disassemble the plug part of RJ45 connector, please install the network cable into the plug part and tighten it. Connect the plug part to the socket part, and then finally tighten it to fix it.