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  2. Samrello
  3. MMS-03

Samrello MMS-03 Modbus register map

Three-phase multifunction energy meter with LCD and RS485 Modbus

  • Official
  • 235 registers
  • Modbus RTU
  • Revision 1 · 2026-11-11

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.

Download .mbmap.json Raw JSON View on GitHub Suggest a correction Report a problem

Communication

Protocol
Modbus RTU
Unit ID
1
Serial
9600 8E1 · 9600 baud, 8 data bits, even parity, 1 stop bit defaults
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
1 holding register, 234 input registers
Groups
11
Translation tables
1
Revision
1 · 2026-11-11
Added
()
File
maps/samrello/mms-03.mbmap.json · 64 KB · history
SHA-256
2ee76d51d8e158e851e53703ef6e5ed1fa39c8a8a8973e86a7a3466dadf70396
Manufacturer
samrello.com.br

Sources and notes

  • MMS-03 Modbus Registers
    Spreadsheet supplied with the map request

Source: Samrello, MMS-03 Modbus Registers (spreadsheet)

  • Addresses are those in the spreadsheet, used as they are (address_base 0). Input registers are read with function 0x04. All values are big endian.
  • Energies are 64-bit integers in micro-units (µWh, µvarh, µVAh); the scale converts them to Wh, varh and VAh.
  • The spreadsheet gives the hour timers at 53 and 55 as '33 bit' and '34 bit' unsigned; they are taken as 32-bit like the first one at 51.
  • The spreadsheet gives no serial settings (baud rate, parity, stop bits) or unit id, so none are set here.
  • The THD values are sent as the actual value divided by 100 (a ratio), so the scale of 100 gives percent. The individual harmonics 2 to 31 are sent as the actual value multiplied by 100, so the scale of 0.01 gives percent.
  • Register 4000 is write-only: the spreadsheet says to send 'T' for relay on and 'F' for relay off.
AreaAddressNameTypeAccessUnitScaleDescription
IR 0 uint16 R
IR 2 uint16 R
IR 4 uint16 R
IR 6 uint16 R
IR 8 uint16 R
IR 9 uint64 ABCD R Wh ×0.000001 Sent in µWh
IR 13 uint64 ABCD R VARh ×0.000001 Sent in µVARh
IR 17 uint64 ABCD R VARh ×0.000001 Sent in µVARh
IR 21 uint64 ABCD R VAh ×0.000001 Sent in µVAh
IR 25 uint64 ABCD R Wh ×0.000001 Sent in µWh
IR 29 uint64 ABCD R VARh ×0.000001 Sent in µVARh
IR 33 uint64 ABCD R VARh ×0.000001 Sent in µVARh
IR 37 uint64 ABCD R VAh ×0.000001 Sent in µVAh
IR 41 float32 ABCD R Hz
IR 43 float32 ABCD R kW/kVA
IR 45 float32 ABCD R kW/kVA
IR 47 float32 ABCD R kW/kVA
IR 49 float32 ABCD R kW/kVA
IR 51 uint32 ABCD R h ×0.1 Sent in tenths of an hour
IR 53 uint32 ABCD R h ×0.1 Sent in tenths of an hour
IR 55 uint32 ABCD R h ×0.1 Sent in tenths of an hour
IR 57 float32 ABCD R V
IR 59 float32 ABCD R V
IR 61 float32 ABCD R °
IR 63 float32 ABCD R A
IR 65 float32 ABCD R
IR 67 float32 ABCD R W
IR 69 float32 ABCD R var
IR 71 float32 ABCD R VA
IR 73 float32 ABCD R °
IR 75 float32 ABCD R % ×100 The device sends the actual value divided by 100
IR 77 float32 ABCD R % ×100 The device sends the actual value divided by 100
IR 79 float32 ABCD R V
IR 81 float32 ABCD R V
IR 83 float32 ABCD R °
IR 85 float32 ABCD R A
IR 87 float32 ABCD R
IR 89 float32 ABCD R W
IR 91 float32 ABCD R var
IR 93 float32 ABCD R VA
IR 95 float32 ABCD R °
IR 97 float32 ABCD R % ×100 The device sends the actual value divided by 100
IR 99 float32 ABCD R % ×100 The device sends the actual value divided by 100
IR 101 float32 ABCD R V
IR 103 float32 ABCD R V
IR 105 float32 ABCD R °
IR 107 float32 ABCD R A
IR 109 float32 ABCD R
IR 111 float32 ABCD R W
IR 113 float32 ABCD R var
IR 115 float32 ABCD R VA
IR 117 float32 ABCD R °
IR 119 float32 ABCD R % ×100 The device sends the actual value divided by 100
IR 121 float32 ABCD R % ×100 The device sends the actual value divided by 100
IR 1000 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1001 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1002 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1003 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1004 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1005 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1006 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1007 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1008 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1009 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1010 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1011 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1012 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1013 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1014 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1015 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1016 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1017 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1018 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1019 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1020 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1021 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1022 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1023 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1024 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1025 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1026 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1027 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1028 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1029 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1030 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1031 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1032 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1033 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1034 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1035 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1036 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1037 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1038 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1039 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1040 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1041 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1042 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1043 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1044 uint16 R % ×0.01 The device sends the actual value multiplied by 100
IR 1045 uint16 R % ×0.01 The device sends the actual value multiplied by 100

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