How is the power cable connected to the back of the Sapphire Site Controller?

The power cable for the Sapphire Site Controller is connected through a serial style port. This type of port is designed to facilitate direct communication and power delivery between devices, making it suitable for connecting peripherals like the power supply.

Serial ports are commonly used in various electronic devices due to their simplicity and ability to maintain stable connections over longer distances compared to some other connection types. In this context, using a serial style port allows for a reliable way to ensure the controller receives the necessary power to operate effectively.

The other connection types listed are not intended for power connection. For example, USB ports are typically used for data transfer and do not provide a robust power connection that a device like the Sapphire Site Controller would require. Ethernet ports are primarily for network connections, enabling communication over a local area network, while HDMI ports are used for transmitting high-definition video and audio signals, not for power supply.