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Data TypesModbus Term

UINT32 (32-bit Unsigned Integer)

A 32-bit unsigned integer spanning two consecutive Modbus registers.

Definition

UINT32 stores a 32-bit unsigned integer (0–4,294,967,295) in two consecutive 16-bit registers. Common uses include energy counters (kWh × 10), odometers, and large counters. Byte order determines which register holds the high 16 bits — always check the device datasheet. Use FC03 to read 2 registers and combine them.

Quick Facts

Range0–4,294,967,295
Size2 registers (4 bytes)
Common useEnergy counters, large totals

Related Terms

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ModPackQT Modbus Glossary · Updated 2026