> For the complete documentation index, see [llms.txt](https://docs.lorric.com/qr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lorric.com/qr/fp-as310-english-v5/communication/modbus-rtu-protocol/read-only-memory-rom.md).

# Read-Only Memory (ROM)

Read-Only Memory is used to store the device's real-time status, measurement results, and flow-related memory. The data is read-only and can only be accessed via the Read command. Values cannot be modified using write commands.


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