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ITGlossary · Service and warranty
Serial Number
The unique code of each device, printed on its label, which you need for warranty and repairs.
Technical level:Basic
Two units of the same model always have different serial numbers. The serial number identifies that particular unit: when it was made, whether its warranty is active and what its repair history is.
It is on a sticker, usually at the back or underneath the device, and often repeated on the box. You need it to register the warranty and for every fault report.
Take a photo of the label as soon as you install the device. A UPS inside a rack or behind furniture is hard to turn around at the moment you need the number.
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Related terms
- WarrantyThe manufacturer’s commitment to repair or replace a device that develops a defect within a set period.
- RMA (Return Merchandise Authorization)The number each repair request receives, so you can follow your device through the repair.
- Charging Power (kW)How much energy flows into the battery per hour, which in AC charging depends on voltage, current and the number of phases.
- IP Rating (Ingress Protection)Two-digit code under IEC 60529 in which the first digit shows protection against dust and solid objects and the second against water.
- Operating Temperature and Humidity RangeThe limits of room temperature and relative humidity within which a device is designed to operate correctly.
- RS-485Differential serial interface over a wire pair that links many devices on one bus over long distances, usually with the Modbus RTU protocol.