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  2. Electron do Brasil
  3. EPU

Electron do Brasil EPU Modbus register map

Thermal protection unit with 16 temperature sensors, alarm, trip, fault and two fan relays, analog outputs and Modbus RTU

  • Official
  • 252 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
252 holding registers
Groups
7
Translation tables
8
Revision
1 · 2026-11-10
Added
()
File
maps/electron/epu.mbmap.json · 46 KB · history
SHA-256
821ffb9c60bfda09548c00499307752eb74f6726072a2c56d0b283f2e69b79af
Manufacturer
electron.com.br

Sources and notes

Source: Electron do Brasil, Mapa de Registradores MODBUS RTU, EPU, v4.0

  • All registers are holding registers. The document numbers them from 1 and calls the type 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 with automatic baud rate detection and 8 data bits, 1 stop bit. It gives no default baud rate or slave address: 9600 N and 1 are placeholders; the slave address is in register 205.
  • Temperatures have the scale -1000:10 in the document. It is read here as: value = raw / 10 - 100, which fits the stated range of -50 to 250 with raw values from 500 to 3500. This reading is not confirmed by the document: check one value against the display.
  • The document has 16 temperature sensors. Register 169 (sensor 10) is printed as 196 in the document; the sequence 160 to 175 is used.
  • Left out because the document is unclear or inconsistent: the sensor offset registers 80 to 95 (called OF7), the current output range registers 100 to 135 (register 105 is missing and 135 repeats S15), the output correction registers 148 to 152, register 153 (commands, no detail), the minimum temperatures 211 to 226 (no scale given) and the latitude, longitude and serial number registers 228 to 231 and 235 to 237.
  • Registers 77, 78, 155, 156, 198 to 204 are bit fields, one entry per bit.
  • Written from the manufacturer's document; not tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 1 uint16 RW °C ×0.1 −100
HR 2 uint16 RW °C ×0.1 −100
HR 3 uint16 RW °C ×0.1 −100
HR 4 uint16 RW °C ×0.1 −100
HR 5 uint16 RW °C ×0.1 −100
HR 6 uint16 RW °C ×0.1 −100
HR 7 uint16 RW °C ×0.1 −100
HR 8 uint16 RW °C ×0.1 −100
HR 9 uint16 RW °C ×0.1 −100
HR 10 uint16 RW °C ×0.1 −100
HR 11 uint16 RW °C ×0.1 −100
HR 12 uint16 RW °C ×0.1 −100
HR 13 uint16 RW °C ×0.1 −100
HR 14 uint16 RW °C ×0.1 −100
HR 15 uint16 RW °C ×0.1 −100
HR 16 uint16 RW °C ×0.1 −100
HR 20 uint16 RW °C ×0.1
HR 21 uint16 RW °C ×0.1 −100
HR 22 uint16 RW °C ×0.1 −100
HR 23 uint16 RW °C ×0.1 −100
HR 24 uint16 RW °C ×0.1 −100
HR 25 uint16 RW °C ×0.1 −100
HR 26 uint16 RW °C ×0.1 −100
HR 27 uint16 RW °C ×0.1 −100
HR 28 uint16 RW °C ×0.1 −100
HR 29 uint16 RW °C ×0.1 −100
HR 30 uint16 RW °C ×0.1 −100
HR 31 uint16 RW °C ×0.1 −100
HR 32 uint16 RW °C ×0.1 −100
HR 33 uint16 RW °C ×0.1 −100
HR 34 uint16 RW °C ×0.1 −100
HR 35 uint16 RW °C ×0.1 −100
HR 36 uint16 RW °C ×0.1 −100
HR 40 uint16 RW min
HR 41 uint16 RW °C ×0.1 −100
HR 42 uint16 RW °C ×0.1 −100
HR 43 uint16 RW °C ×0.1 −100
HR 44 uint16 RW °C ×0.1 −100
HR 45 uint16 RW °C ×0.1 −100
HR 46 uint16 RW °C ×0.1 −100
HR 47 uint16 RW °C ×0.1 −100
HR 48 uint16 RW °C ×0.1 −100
HR 49 uint16 RW °C ×0.1 −100
HR 50 uint16 RW °C ×0.1 −100
HR 51 uint16 RW °C ×0.1 −100
HR 52 uint16 RW °C ×0.1 −100
HR 53 uint16 RW °C ×0.1 −100
HR 54 uint16 RW °C ×0.1 −100
HR 55 uint16 RW °C ×0.1 −100
HR 56 uint16 RW °C ×0.1 −100
HR 57 uint16 RW
HR 61 uint16 RW °C ×0.1 −100
HR 62 uint16 RW °C ×0.1 −100
HR 63 uint16 RW °C ×0.1 −100
HR 64 uint16 RW °C ×0.1 −100
HR 65 uint16 RW °C ×0.1 −100
HR 66 uint16 RW °C ×0.1 −100
HR 67 uint16 RW °C ×0.1 −100
HR 68 uint16 RW °C ×0.1 −100
HR 69 uint16 RW °C ×0.1 −100
HR 70 uint16 RW °C ×0.1 −100
HR 71 uint16 RW °C ×0.1 −100
HR 72 uint16 RW °C ×0.1 −100
HR 73 uint16 RW °C ×0.1 −100
HR 74 uint16 RW °C ×0.1 −100
HR 75 uint16 RW °C ×0.1 −100
HR 76 uint16 RW °C ×0.1 −100
HR 77 bool bit 0 RW 0 = automatic, 1 = forced on
HR 77 bool bit 1 RW 0 = automatic, 1 = forced on
HR 78 bool bit 0 RW
HR 79 uint16 RW °C ×0.1
HR 136 uint16 RW
HR 137 uint16 RW
HR 138 uint16 RW
HR 139 uint16 RW
HR 140 uint16 RW
HR 141 uint16 RW
HR 142 uint16 RW Bit mask of the sensors that feed the output: bit 0 is sensor 1, bit 15 is sensor 16, 1 = enabled
HR 143 uint16 RW Bit mask of the sensors that feed the output: bit 0 is sensor 1, bit 15 is sensor 16, 1 = enabled
HR 144 uint16 RW Bit mask of the sensors that feed the output: bit 0 is sensor 1, bit 15 is sensor 16, 1 = enabled
HR 145 uint16 RW Bit mask of the sensors that feed the output: bit 0 is sensor 1, bit 15 is sensor 16, 1 = enabled
HR 146 uint16 RW Bit mask of the sensors that feed the output: bit 0 is sensor 1, bit 15 is sensor 16, 1 = enabled
HR 147 uint16 RW Time between sensors in scan mode; the document gives no unit or range
HR 154 uint16 RW
HR 155 bool bit 0 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 1 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 2 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 3 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 4 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 5 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 6 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 7 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 8 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 9 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 10 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 11 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 12 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 13 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 14 RW The document describes only the disabled state (0); 1 is taken to be enabled
HR 155 bool bit 15 RW The document describes only the disabled state (0); 1 is taken to be enabled

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