SIM card slot for wide connectivity: supports IoT traffic cards or ordinary mobile phone cards, providing full network access. Installation note: the metal side of the SIM card faces down, and the card direction should be observed. RS485 communication interface: connect A+ to the inverter RS485+ and B to the inverter RS485 for reliable data exchange. TypeC USB 5V power supply interface: power can be supplied via KF128 terminal power supply or via USB power supply. DC436V terminal power port: supports 836V input with GND linked to the inverter 24V GND interface for stable operation. Compatibility and practical performance: designed to integrate with standard inverter RS485 wiring and KF128 power configurations, offering flexible power options and dependable network connectivity for remote monitoring and control. Use scenarios: Remote monitoring of solar or battery inverter systems in offgrid or gridtied installations, using an IoT SIM for data transmission and RS485 for inverter communication. Industrial automation setups requiring reliable RS485 links to an inverter and flexible power supply options (KF128 terminal or USB) in harsh or remote environments. Mobile or temporary deployments where a USB power source is available, or KF128 power supply is used, with ongoing network access via a standard SIM card. Key benefits: Flexible power options (KF128 terminal or USB) for varied installation environments. Reliable RS485 connection to the inverter ensures stable control and monitoring. Broad SIM card compatibility enables IoT connectivity and full network access. Clear installation guidance for SIM orientation to ensure proper operation.