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ITGlossary · Communication and monitoring
USB Port
A USB interface used for communication between UPS and computers.
Technical level:Basic
Through the USB port, the UPS tells the computer about its status: whether it is running on mains or battery, the charge level, the load and any faults. Many UPS units appear to the operating system as an HID device, like a laptop battery, so Windows, macOS or Linux recognise them without extra drivers.
The most useful function is automatic, controlled shutdown: when the battery falls below a threshold, the computer saves its data and shuts down properly instead of switching off abruptly. A USB connection usually serves one computer. For several servers or remote monitoring, an SNMP network card is needed.
Connect the cable and configure the software right after installation. Without it, the UPS simply drains its battery and the computer switches off without warning.
Related terms
- Serial PortA communication port on a UPS used to connect and transmit signals to computers or monitoring equipment.
- Ethernet Port (RJ45)The UPS's Ethernet network port, through which it can be monitored and controlled from any computer on the network via a browser, SNMP or shutdown software.
- ModbusA communication protocol used for connecting industrial electronic devices, including UPS systems.
- RS-232Point-to-point serial communication standard, usually on a DB9 connector, for linking a UPS to one computer over a distance of a few metres.
- Dry ContactA passive relay contact used to transmit status signals without applying voltage.
- Network Management Card (NMC)An interface card enabling remote monitoring and control of UPS systems via network.