Schneider Electric iEM3200, iEM3300 Modbus functions, Function list, Table format, Unit table

Communications via Modbus RS-485 iEM3100 / iEM3200 / iEM3300 series user manual

Modbus functions

Function list

The table below lists the supported Modbus functions:

Function code		Function name
Decimal	Hexadecimal
3	0x03	Read Holding Registers
16	0x10	Write Multiple Registers
43/14	0x2B/0x0E	Read Device Identification

For example:

•To read different parameters from the meter, use function 3 (Read).

•To change the tariff, use function 16 (Write) to send a command to the meter.

Table format

Register tables have the following columns:

Register Address Action (R/W/WC)

Size

Type

Units Range

Description

•Register Address: Modbus address of register encoded in the Modbus frame, in decimal (dec)

•Action: The read/write/write by command property of the register

•Size: The data size in Int16

•Type: The encoding data type

•Units: The unit of the register value

•Range: The permitted values for this variable, usually a subset of what the format allows

•Description: Provides information about the register and the values that apply

Unit table

The following data types appear in the Modbus register list:

Type	Description	Range
UInt16	16 bit unsigned integer	0	– 65535
Int16	16 bit signed integer	-32768 to +32767
UInt32	32 bit unsigned integer	0	– 4 294 967 295
Int64	64 bit unsigned integer	0	– 18 446 744 073 709 551 615
UTF8	8 bit field	multibyte character encoding for Unicode
Float32	32 bit value	Standard representation IEEE for floating number (with single precision)
Bitmap	—	—
DATETIME	See below	—

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