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52 DOCA0005EN-04
Communications via Modbus RS-485 iEM3100 / iEM3200 / iEM3300 series user manual
Modbus functions
Function list
The table below lists the supported Modbus functions:
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: 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:
Function code
Function name
Decimal Hexadecimal
3 0x03 Read Holding Registers
16 0x10 Write Multiple Registers
43/14 0x2B/0x0E Read Device Identification
Register Address Action (R/W/WC) Size Type Units Range Description
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 —