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  3. LKM111 / LKM114

REDZ LKM111 / LKM114 Modbus register map

IEC 62056-21 meter to Modbus RTU gateway with RS232 on the meter side; LKM111 has RS232 and LKM114 RS485 on the Modbus side. Reads one meter

  • Verified
  • 36 registers
  • Modbus RTU
  • Revision 2

Verified: Tested on a real device.

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Communication

Protocol
Modbus RTU
Unit ID
1
Serial
19200 8N1 · 19200 baud, 8 data bits, none parity, 1 stop bit
Byte / word order
ABCD · bytes big-endian, words high first
Addresses
0-based

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

Map

Registers
36 holding registers
Groups
3
Translation tables
1
Revision
2
Added
()
File
maps/redz/lkm111-lkm114.mbmap.json · 12 KB · history
SHA-256
0c37e5b181aad9afafcaad8558a4afd4e9ee9ffe4b0017d8c0a85d52cefe979b
Manufacturer
redz-sc.com

Sources and notes

Source: REDZ, "LKM Series Electricity Meter Protocol to Modbus Protocol Gateways User Manual", sections 6.1, 6.5-6.10 and 8 (standard 24-register firmware)

  • REDZ LKM111 / LKM114.
  • Standard firmware with the OBIS_EURO list (24 values per meter). Other firmware (OBIS_EURO_1..14, TRF, 64-register versions) keeps the same addresses but maps different OBIS codes, so the names below would be wrong for it.
  • Data addresses: the manual's table lists them as 1, 3, 5... (1-based), while its Modbus Poll and ZTerminal examples read
  • Time at wire address 0 and 1.8.0 at 4. This map follows the examples. The settings (128-133) and monitoring (160-189)
  • addresses are wire addresses, as the FC06/FC16 examples show.
  • Values are the read-out digits without the decimal point, so no scale or unit is given: they depend on the meter.
  • Mode switch 1 (OFF-OFF): 19200 8N1 on the Modbus side, 300 baud auto-switching on the meter side.
  • Tested on an LKM111 / LKM114 with one meter, November 2026. All 36 registers of the map were read without errors in 3 requests. Checked: the 32-bit word order (big), the meter values (time, date, energies, maximum demand), the settings, and the monitoring registers (IEC read counter, uptime, both firmware words). Instantaneous values (current, voltage, power factor, frequency) read 0 on the meter in use, so their scaling was not checked.
AreaAddressNameTypeAccessUnitScaleDescription
HR 0 uint32 ABCD R OBIS 0.9.1. hhmmss as digits (10:25:07 reads 102507). 0 if not in the read-out
HR 2 uint32 ABCD R OBIS 0.9.2. yymmdd as digits (22-09-14 reads 220914). 0 if not in the read-out
HR 4 uint32 ABCD R OBIS 1.8.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 6 uint32 ABCD R OBIS 2.8.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 8 uint32 ABCD R OBIS 3.8.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 10 uint32 ABCD R OBIS 4.8.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 12 uint32 ABCD R OBIS 5.8.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 14 uint32 ABCD R OBIS 6.8.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 16 uint32 ABCD R OBIS 7.8.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 18 uint32 ABCD R OBIS 8.8.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 20 uint32 ABCD R OBIS 1.6.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 22 uint32 ABCD R OBIS 2.6.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 24 uint32 ABCD R OBIS 1.5.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 26 uint32 ABCD R OBIS 1.7.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 28 uint32 ABCD R OBIS 31.7.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 30 uint32 ABCD R OBIS 51.7.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 32 uint32 ABCD R OBIS 71.7.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 34 uint32 ABCD R OBIS 32.7.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 36 uint32 ABCD R OBIS 52.7.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 38 uint32 ABCD R OBIS 72.7.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 40 int32 ABCD R OBIS 13.7.0. Can be negative; the manual lists UInt32. 0 if not in the read-out
HR 42 uint32 ABCD R OBIS 14.7.0. Digits of the read-out value without the decimal point (e.g. 6895.2317 reads 68952317): apply the meter's decimals. 0 if not in the read-out
HR 44 uint32 ABCD R OBIS C.1.0. Meter ID / serial number. 0 if not in the read-out
HR 46 int32 ABCD R OBIS 16.7.0. Can be negative; the manual lists UInt32. 0 if not in the read-out
HR 128 uint16 RW Gateway slave id; answers the write with the old id
HR 129 uint16 RW s Wait after each read attempt (default 10)
HR 130 uint16 RW ASCII code sent in the IEC 62056-21 option select message (0x30 = '0' default; 0x37 = '7')
HR 131 uint16 RW Default 1
HR 132 uint16 RW Times the init string is sent before the request; 0 = off
HR 133 uint16 RW Meters read on the bus (this model reads one meter)
HR 160 uint32 ABCD RW IEC 62056-21 device address (usually the serial number); 0 = not used. Write with FC16
HR 162 uint32 ABCD R Successful meter reads
HR 164 uint32 ABCD R s Seconds since power-up; the gateway restarts every 24 h
HR 166 uint32 ABCD R 0xDDMYYYVV: day byte; month nibble; year 12 bits; version byte
HR 168 uint32 ABCD R Same layout as Firmware original; differs after a field upgrade
HR 170 uint32 ABCD RW 4 wake-up bytes sent before the read-out (needs Init string repeat count >= 1). Write with FC16

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