MBMap Registry
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  2. Electron do Brasil
  3. MNO

Electron do Brasil MNO Modbus register map

Oil level monitor (Monitor de Nível de Óleo): float level, alarm and shutdown thresholds, four relays, analog output and Modbus RTU

  • Official
  • 45 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
ABCD · bytes big-endian, words high first
Addresses
1-based · wire address = address − 1

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

Map

Registers
45 holding registers
Groups
6
Translation tables
7
Revision
1 · 2026-11-10
Added
()
File
maps/electron/mno.mbmap.json · 11 KB · history
SHA-256
6eee0d795b6d89b0ccd36789d04f7d2ec4cfac3d8de5fa8104b501f185e8b94c
Manufacturer
electron.com.br

Sources and notes

Source: Electron do Brasil, Mapa de Registradores Modbus RTU, MNO – Monitor de Nível de Óleo, v3.0.2

  • All registers are holding registers. The document numbers them 1 to 38 and calls the type Read Holding Register (40.000), so the addresses are 1-based (address on the wire = number minus 1). The document does not say so explicitly: if a read fails, try address_base 0.
  • The document allows 2400 to 57600 bps, 8 data bits, 1 stop bit and no, even or odd parity. It gives no default baud rate or slave address: 9600 N and 1 are placeholders; the slave address is in register 25.
  • Levels are shown in the document with one decimal and a scale of -1000:10, which it does not explain. They are given as raw values: check against the display before applying a scale. The shutdown delay has no unit in the document.
  • Registers 7, 9, 12, 18, 19 and 20 are bit fields, one entry per bit. The command bits are write-only. The baud rate, parity and protocol registers (22 to 24) are read-only in this document. Registers 26, 29 and 33 to 34 are not in the document.
  • The serial number is 48 bits in registers 35 to 37; it is given as a 16-bit register and a 32-bit one, so it has no serial role.
  • Written from the manufacturer's document; not tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 1 uint16 RW Range 0.1 to 100.0; the document's scale column (-1000:10) is not explained, so the value is raw (check against the display)
HR 2 uint16 RW Range 0.1 to 100.0; the document's scale column (-1000:10) is not explained, so the value is raw (check against the display)
HR 3 uint16 RW Range 0.1 to 100.0; the document's scale column (-1000:10) is not explained, so the value is raw (check against the display)
HR 4 uint16 RW Range 0.1 to 100.0; the document's scale column (-1000:10) is not explained, so the value is raw (check against the display)
HR 5 uint16 RW ×0.1 Range 0.1 to 30.0
HR 6 uint16 RW Range 0 to 20; the unit is not stated
HR 7 bool bit 0 RW
HR 7 bool bit 1 RW
HR 8 uint16 RW
HR 9 bool bit 1 W Write 1
HR 9 bool bit 2 W Write 1
HR 9 bool bit 3 W Write 1
HR 10 uint16 RW Range 0.0 to 999.9; the document's scale column (-1000:10) is not explained, so the value is raw (check against the display)
HR 11 uint16 RW Range 0.0 to 1000.0; the document's scale column (-1000:10) is not explained, so the value is raw (check against the display)
HR 12 bool bit 0 RW
HR 12 bool bit 1 RW
HR 12 bool bit 2 RW
HR 12 bool bit 3 RW
HR 13 int16 RW Range -10.0 to 10.0; the document's scale column (-1000:10) is not explained, so the value is raw (check against the display)
HR 14 uint16 RW
HR 15 int16 RW Range -10.0 to 10.0; the document's scale column (-1000:10) is not explained, so the value is raw (check against the display)
HR 16 int16 RW Range -50.0 to 250.0; the document's scale column (-1000:10) is not explained, so the value is raw (check against the display)
HR 17 int16 RW Range -50.0 to 250.0; the document's scale column (-1000:10) is not explained, so the value is raw (check against the display)
HR 18 bool bit 0 R
HR 18 bool bit 1 R
HR 18 bool bit 2 R
HR 19 bool bit 0 R
HR 19 bool bit 1 R
HR 19 bool bit 2 R
HR 19 bool bit 3 R
HR 19 bool bit 4 R
HR 20 bool bit 0 R
HR 21 uint16 RW
HR 22 uint16 R
HR 23 uint16 R
HR 24 uint16 R
HR 25 uint16 R Range 1 to 254
HR 27 int16 RW Range -1.00 to 1.00; the document's scale column (-1000:100) is not explained, so the value is raw (check against the display)
HR 28 uint16 R Ω ×0.1 Range 0.0 to 1000.0
HR 30 uint16 R Range 1 to 31
HR 31 uint16 R Range 1 to 12
HR 32 uint16 R Range 0 to 99
HR 35 uint16 R Bits 32 to 47 of the 48-bit serial number
HR 36 uint32 ABCD R Registers 36 (bits 16 to 31) and 37 (bits 0 to 15)
HR 38 uint16 R Range 0 to 9999

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