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EncodingModbus Term

Big-Endian (AB CD / ABCD)

The most significant byte is in the lowest address — the 'natural' network order.

Definition

In big-endian byte order (also called AB-CD or 3412 in some tools), the most significant word is in the lower-numbered register and the most significant byte is in the high byte of each register. This is the standard network byte order. Example: for FLOAT32 200.0 (0x43480000), register 0 = 0x4348 and register 1 = 0x0000.

Quick Facts

Also calledAB-CD, ABCD, 3412
MSWLower register
200.0 float32Reg0=0x4348 Reg1=0x0000

Related Terms

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ModPackQT Modbus Glossary · Updated 2026