Generic Modbus Data Types

Type

Description

I1one-byte character
UI1unsigned one-byte value
I2signed two-byte integer
UI2unsigned two-byte integer
I4signed four-byte integer
UI4unsigned four-byte integer
R4single precision IEEE floating point
R8double precision IEEE floating point
BOOLBoolean (on/off) value
ARRAYarray of specified data type
STRINGstring

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