MBMap Registry
  1. Devices
  2. Electron do Brasil
  3. MoniTemp Plus

Electron do Brasil MoniTemp Plus Modbus register map

Digital temperature monitor for transformers (ANSI 49I / 49): oil and two winding sensors, thermal image, two fan groups, alarm, shutdown and fault relays, analog output and Modbus RTU

  • Official
  • 104 registers
  • Modbus RTU
  • Revision 1 · 2026-11-10
  • Identity: serial number

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
104 holding registers
Groups
7
Translation tables
10
Revision
1 · 2026-11-10
Added
()
File
maps/electron/monitemp-plus.mbmap.json · 24 KB · history
SHA-256
9c04e090d89ec7add6db76fbe4445d1cf2cb3356ba2187ed877b9bdb92180aa9
Manufacturer
electron.com.br

Device identity

What a tool can read to check that this map fits the connected device (SPEC.md section 4.7). Registers with a role are read like any other register.

Registers
RoleRegisterAddressTypeValues
Serial number Serial number holding 83 uint32 CDAB

Sources and notes

Source: Electron do Brasil, Mapa de Registradores Modbus RTU, MoniTemp Plus, v3.2

  • All registers are holding registers. The document numbers them 2 to 89 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 1200 to 57600 bps with automatic baud rate detection, 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 78.
  • Temperatures 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. Registers with a scale of 1:10, 1:100 or 1:1000 are scaled as written.
  • Registers 17, 19, 23, 30, 48, 66, 67, 68 and 71 are bit fields, one entry per bit. The command bits 3 to 5 of register 19 are write-only. Registers 1, 44, 45, 49, 53, 54, 72, 73 and the fan state registers 69 and 70 (their labels repeat the shutdown labels) are not mapped.
  • The document has several copy-and-paste slips; where a label is clearly wrong the register description says how it was read (winding 2 alarm bit, oil shutdown bit, the fan drive bits).
  • Written from the manufacturer's document; not tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 2 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 3 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 4 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 5 int16 RW The document calls it "desligamento por carregamento habitado" with a temperature range; its meaning is not clear. 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 6 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 7 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 8 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 9 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 10 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 11 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 12 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 13 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 14 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 15 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 16 int16 RW min The document gives a temperature range and scale for it
HR 17 bool bit 0 RW
HR 17 bool bit 1 RW Bit 1 set: fan group drive activated
HR 18 uint16 RW
HR 19 bool bit 0 RW 0 = automatic, 1 = forced on
HR 19 bool bit 1 RW 0 = automatic, 1 = forced on; the document writes "when 3" for the on state
HR 19 bool bit 2 RW Write 1
HR 19 bool bit 3 W Write 1
HR 19 bool bit 4 W Write 1
HR 19 bool bit 5 W Write 1
HR 20 uint16 RW
HR 23 bool bit 0 RW
HR 23 bool bit 1 RW
HR 23 bool bit 2 RW The document describes both states as automatic
HR 23 bool bit 3 RW
HR 23 bool bit 4 RW
HR 23 bool bit 5 RW
HR 24 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 25 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 26 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 27 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 28 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 29 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 30 bool bit 0 R Read only in the document
HR 30 bool bit 1 RW
HR 30 bool bit 2 RW
HR 31 uint16 R
HR 32 uint16 RW ×0.1
HR 33 uint16 RW ×0.1
HR 34 uint16 RW ×0.1
HR 35 uint16 RW ×0.1
HR 36 uint16 RW ×0.1
HR 37 uint16 RW
HR 38 uint16 RW
HR 39 uint16 RW ×0.001 Range 1 to 9999, scale 1:1000
HR 40 uint16 RW ×0.001 Range 1 to 9999, scale 1:1000
HR 41 uint16 RW
HR 42 uint16 RW
HR 43 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 46 int16 RW Range -1.00 to 1.00; the document's scale column (-1000:10) is not explained, so the value is raw (check against the display)
HR 47 int16 RW Range -1.00 to 1.00; the document's scale column (-1000:10) is not explained, so the value is raw (check against the display)
HR 48 bool bit 0 RW
HR 48 bool bit 1 RW
HR 48 bool bit 2 RW
HR 48 bool bit 3 RW
HR 48 bool bit 4 RW
HR 48 bool bit 5 RW
HR 48 bool bit 6 RW
HR 48 bool bit 7 RW
HR 50 int16 R 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 51 int16 R 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 52 int16 R 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 55 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 56 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 57 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 58 uint16 R ×0.1 Range 0 to 2000, scale 1:10
HR 59 uint16 R ×0.1 Range 0 to 2000, scale 1:10
HR 60 uint16 R ×0.1 Range 0 to 9999, scale 1:10
HR 61 uint16 R ×0.01 Range 0 to 9999, scale 1:100 (as printed; register 60 is 1:10)
HR 62 uint16 R ×0.01 Range 0 to 9999, scale 1:100
HR 63 uint16 R ×0.01 Range 0 to 9999, scale 1:100
HR 64 uint16 R ×0.01 Range 0 to 9999, scale 1:100
HR 65 uint16 R ×0.01 Range 0 to 9999, scale 1:100
HR 66 bool bit 0 R
HR 66 bool bit 1 R
HR 66 bool bit 2 R The document labels this bit winding 1, like bit 1; taken to be winding 2
HR 67 bool bit 0 R
HR 67 bool bit 1 R
HR 67 bool bit 2 R
HR 68 bool bit 0 R The document labels this bit fan/pump of the oil; taken to be the oil shutdown
HR 68 bool bit 1 R
HR 68 bool bit 2 R
HR 71 bool bit 0 R
HR 71 bool bit 1 R
HR 71 bool bit 2 R
HR 74 uint16 R
HR 75 uint16 R
HR 76 uint16 R
HR 77 uint16 R
HR 78 uint16 R Range 1 to 254
HR 79 uint16 R Range 0 to 9999
HR 80 uint16 R
HR 81 uint16 R
HR 82 uint16 R Range 2017 to 2099
HR 83 uint32 CDAB R Registers 83 (LSB) and 84 (MSB), up to 0xFFFFFF
HR 85 uint16 RW

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