MBMap Registry
  1. Devices
  2. KRON
  3. Mult-K

KRON Mult-K Modbus register map

Also covers Mult-K Plus, Mult-K Grafic, Mult-K C, Mult-K 05, Mult-K 120

Three-phase multimeter and transducer family: voltages, currents, frequency, power, power factor, energy, demand, THD, minimums and maximums, settings and reset commands

  • Official
  • 139 registers
  • Modbus RTU
  • Revision 1 · 2026-11-10

Official: Written from the manufacturer's documentation, but not tested on a device yet. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.

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Communication

Protocol
Modbus RTU
Unit ID
1
Serial
9600 8N1 · 9600 baud, 8 data bits, none parity, 1 stop bit
Byte / word order
DCBA · bytes little-endian, words low first (word swap)
Addresses
1-based · wire address = address − 1
Max read
12 registers per request

Connection values are defaults: the device may be configured differently.

Map

Registers
9 holding registers, 108 input registers, 18 coils, 4 discrete inputs
Groups
15
Translation tables
2
Revision
1 · 2026-11-10
Added
()
File
maps/kron/mult-k.mbmap.json · 27 KB · history
SHA-256
5d8e1aa26529224bce80216ed275f40f48cd3881b3ad14e76cea3009310c436a
Manufacturer
kron.com.br

Sources and notes

Source: KRON, "Protocolo MODBUS – Família Mult-K", rev. 4.7 (May 2023)

  • Modbus RTU on RS-485. Addresses are numbered from 1 as in the document (30.015 is input register 15, sent as 14; 40.001 is holding register 1). Commands are coils: command 006 is coil 6, sent as 5.
  • Float values use the KRON sequence F2, F1, F0, EXP, which is the bytes fully reversed (the document's example sends 60 Hz as 00 00 70 42): little byte order and little word order. That is the default of holding register 301; changing it breaks the float registers. Integer registers (MSB, LSB) override this with big byte order.
  • The document lists the models Mult-K, Mult-K Plus, Mult-K Grafic, Mult-K C, Mult-K 05 and Mult-K 120. Some registers exist only on some of them; this is said in the description of each register. The document does not say whether the registers are absent or return an error on the others.
  • Holding registers are read at most 12 at a time and written at most 10; input registers up to 94 at a time. The max_read_registers value of 12 is the smaller limit.
  • Serial settings: 9600 to 57600 bit/s, 8 data bits, parity none, even or odd, 1 or 2 stop bits. The document gives no factory default; 9600 8N1 and address 1 are assumed here. The baud rate and format fields are available on Mult-K 05, Mult-K 120 and Mult-K 30Wh through holding register 7; the other models are set on the display.
  • The document also describes unsigned and signed 16-bit copies of the readings (registers 38.301 to 38.762). They are scaled by model, TP and TC with formulas in the document and are not mapped. The minimums and maximums are listed for Mult-K Grafic and Mult-K C; the document marks some of them as also available on Mult-K Plus from firmware 3.0. The special functions (0x42 Config Address, 0x71, 0x75, 0x76) and Report Slave ID, whose answer is not the standard layout, are not mapped.
  • Written from the protocol document; this map has not been tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
IR 1 uint32 ABCD R
IR 3 float32 DCBA R V
IR 5 float32 DCBA R A
IR 7 float32 DCBA R
IR 9 float32 DCBA R VA
IR 11 float32 DCBA R var
IR 13 float32 DCBA R W
IR 15 float32 DCBA R Hz
IR 17 float32 DCBA R V In delta systems (connection types 48 and 49) this register holds the line-to-line voltage, for compatibility with the MKM line
IR 19 float32 DCBA R V In delta systems (connection types 48 and 49) this register holds the line-to-line voltage, for compatibility with the MKM line
IR 21 float32 DCBA R V In delta systems (connection types 48 and 49) this register holds the line-to-line voltage, for compatibility with the MKM line
IR 23 float32 DCBA R A
IR 25 float32 DCBA R A
IR 27 float32 DCBA R A
IR 29 float32 DCBA R W
IR 31 float32 DCBA R W
IR 33 float32 DCBA R W
IR 35 float32 DCBA R var
IR 37 float32 DCBA R var
IR 39 float32 DCBA R var
IR 41 float32 DCBA R VA
IR 43 float32 DCBA R VA
IR 45 float32 DCBA R VA
IR 47 float32 DCBA R
IR 49 float32 DCBA R
IR 51 float32 DCBA R
IR 53 float32 DCBA R kWh
IR 55 float32 DCBA R kvarh
IR 57 float32 DCBA R kWh
IR 59 float32 DCBA R kvarh
IR 61 float32 DCBA R kW
IR 63 float32 DCBA R kW
IR 65 float32 DCBA R kVA
IR 67 float32 DCBA R kVA
IR 85 float32 DCBA R V
IR 87 float32 DCBA R V
IR 89 float32 DCBA R V
IR 91 float32 DCBA R V
IR 93 float32 DCBA R A
IR 95 float32 DCBA R Mult-K 120 only
IR 97 float32 DCBA R Mult-K 120 only
IR 99 float32 DCBA R kWh Mult-K 05 and Mult-K 120 only
IR 101 float32 DCBA R A Mult-K Plus from firmware 3.0, Mult-K Grafic and Mult-K C only
IR 201 int16 R % ×0.1
IR 202 int16 R % ×0.1
IR 203 int16 R % ×0.1
IR 204 int16 R % ×0.1
IR 205 int16 R % ×0.1
IR 206 int16 R % ×0.1
IR 221 uint16 R Bit field, see Read Exception Status: 1 phase reversal or loss, 2 math error, 4 pulse overflow, 8 Vrms or Irms limit exceeded, 16 incorrect restart, 128 mass memory failure (Plus and Grafic)
IR 403 float32 DCBA R V Mult-K Grafic and Mult-K C only
IR 405 float32 DCBA R A Mult-K Grafic and Mult-K C only
IR 407 float32 DCBA R Mult-K Grafic and Mult-K C only
IR 409 float32 DCBA R VA Mult-K Grafic and Mult-K C only
IR 411 float32 DCBA R var Mult-K Grafic and Mult-K C only
IR 413 float32 DCBA R W Mult-K Grafic and Mult-K C only
IR 415 float32 DCBA R Hz Mult-K Grafic and Mult-K C only
IR 417 float32 DCBA R V Mult-K Grafic and Mult-K C only
IR 419 float32 DCBA R V Mult-K Grafic and Mult-K C only
IR 421 float32 DCBA R V Mult-K Grafic and Mult-K C only
IR 423 float32 DCBA R A Mult-K Grafic and Mult-K C only
IR 425 float32 DCBA R A Mult-K Grafic and Mult-K C only
IR 427 float32 DCBA R A Mult-K Grafic and Mult-K C only
IR 429 float32 DCBA R W Mult-K Grafic and Mult-K C only
IR 431 float32 DCBA R W Mult-K Grafic and Mult-K C only
IR 433 float32 DCBA R W Mult-K Grafic and Mult-K C only
IR 435 float32 DCBA R var Mult-K Grafic and Mult-K C only
IR 437 float32 DCBA R var Mult-K Grafic and Mult-K C only
IR 439 float32 DCBA R var Mult-K Grafic and Mult-K C only
IR 441 float32 DCBA R VA Mult-K Grafic and Mult-K C only
IR 443 float32 DCBA R VA Mult-K Grafic and Mult-K C only
IR 445 float32 DCBA R VA Mult-K Grafic and Mult-K C only
IR 447 float32 DCBA R Mult-K Grafic and Mult-K C only
IR 449 float32 DCBA R Mult-K Grafic and Mult-K C only
IR 451 float32 DCBA R Mult-K Grafic and Mult-K C only
IR 485 float32 DCBA R V Mult-K Grafic and Mult-K C only
IR 487 float32 DCBA R V Mult-K Grafic and Mult-K C only
IR 489 float32 DCBA R V Mult-K Grafic and Mult-K C only
IR 501 float32 DCBA R A Mult-K Grafic and Mult-K C only
IR 703 float32 DCBA R V Mult-K Grafic and Mult-K C only
IR 705 float32 DCBA R A Mult-K Grafic and Mult-K C only
IR 707 float32 DCBA R Mult-K Grafic and Mult-K C only
IR 709 float32 DCBA R VA Mult-K Grafic and Mult-K C only
IR 711 float32 DCBA R var Mult-K Grafic and Mult-K C only
IR 713 float32 DCBA R W Mult-K Grafic and Mult-K C only
IR 715 float32 DCBA R Hz Mult-K Grafic and Mult-K C only
IR 717 float32 DCBA R V Mult-K Grafic and Mult-K C only
IR 719 float32 DCBA R V Mult-K Grafic and Mult-K C only
IR 721 float32 DCBA R V Mult-K Grafic and Mult-K C only
IR 723 float32 DCBA R A Mult-K Grafic and Mult-K C only
IR 725 float32 DCBA R A Mult-K Grafic and Mult-K C only
IR 727 float32 DCBA R A Mult-K Grafic and Mult-K C only
IR 729 float32 DCBA R W Mult-K Grafic and Mult-K C only
IR 731 float32 DCBA R W Mult-K Grafic and Mult-K C only
IR 733 float32 DCBA R W Mult-K Grafic and Mult-K C only
IR 735 float32 DCBA R var Mult-K Grafic and Mult-K C only
IR 737 float32 DCBA R var Mult-K Grafic and Mult-K C only
IR 739 float32 DCBA R var Mult-K Grafic and Mult-K C only
IR 741 float32 DCBA R VA Mult-K Grafic and Mult-K C only
IR 743 float32 DCBA R VA Mult-K Grafic and Mult-K C only

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