HART Protocol and 4–20 mA Loop Communication Fundamentals Practice Test

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What is the Read UID command used for in HART?

To update firmware

To uniquely identify a device for asset management, calibration records, and replacement

The Read UID command returns the device’s unique identifier, a stable tag assigned to that instrument. This unique ID allows you to clearly identify the exact device in your asset registry, link it to its calibration certificates and maintenance history, and ensure you replace the correct unit when needed. It’s specifically about identification and traceability, not about changing firmware, adjusting measurement ranges, or reading diagnostics—which are handled by other HART commands.

To adjust measurement range

To read digital diagnostics