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EncodingModbus Term

Word-Swap (CD AB / CDAB)

Registers are swapped but bytes within each register stay in big-endian order.

Definition

Word-swap (CD-AB) places the least significant 16-bit word in the lower register address, but keeps the bytes within each register in their natural big-endian order. This is very common in Schneider Energy meters, SolarEdge inverters, and many other industrial devices. Example: FLOAT32 200.0 — Reg0=0x0000 Reg1=0x4348.

Quick Facts

Also calledCD-AB, CDAB, 1032
Register orderLSW first
Byte order in regBig-endian
200.0 float32Reg0=0x0000 Reg1=0x4348

Related Terms

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ModPackQT Modbus Glossary · Updated 2026