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  2. Electron do Brasil
  3. DVR

Electron do Brasil DVR Modbus register map

Digital voltage regulator relay (ANSI 90) for tap changers with eight regulation sets, parallel operation and Modbus RTU

  • Official
  • 351 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
351 holding registers
Groups
16
Translation tables
20
Revision
1 · 2026-11-10
Added
()
File
maps/electron/dvr.mbmap.json · 66 KB · history
SHA-256
e28e68ea6aa3a6dd1042aa5d3978d1ec9737c5d931a2098fad4141a46fb6a9d4
Manufacturer
electron.com.br

Sources and notes

Source: Electron do Brasil, Mapa de Registradores MODBUS RTU, DVR (Relé Regulador de Tensão Digital), v4.1

  • 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, 8 data bits and no, even or odd parity. It gives no default baud rate, stop bits or slave address: 9600 N 1 and unit 1 are placeholders.
  • Scales written as 1:N in the document are read as raw / N. An offset such as -100 (tap positions) is added to the raw value, and -250:10 (line drop components, raw 0 to 500) is read as raw / 10 - 25. These readings are interpretations of the document and are not confirmed on a device.
  • The document lists eight regulation sets with the same layout, 30 registers apart (10, 40, 70 ... 220). Set 1 has no schedule registers. The ranges printed for set 7 and some typing errors in the document were not used.
  • Primary side measurements are labelled kV, kA, MVA, MW and MVar after the display table of the document, but the measurement table gives no unit and its ranges do not fit a 16-bit value at the stated scale: check them against the display.
  • Left out because the document is unclear, repeated or inconsistent: the phase selector (register 1), registers 275 and 276, 293, 305 and 306, the relay configuration registers 430 to 564 (functions, logic, timing and triggers of 14 relays), the parallel network registers 570 to 724, the analog output range registers 340 to 374, the display line registers 379 to 390 and the maintenance and history registers 801 to 884.
  • Registers 3, 214, 260, 287 and 899 are bit fields, one entry per bit.
  • Written from the manufacturer's document; not tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 2 uint16 RW
HR 3 bool bit 0 RW
HR 3 bool bit 1 RW
HR 3 bool bit 2 RW
HR 3 bool bit 3 RW
HR 3 bool bit 4 RW
HR 3 bool bit 5 RW
HR 3 bool bit 6 RW
HR 3 bool bit 7 RW
HR 10 uint16 RW V ×0.1
HR 11 uint16 RW % ×0.1
HR 12 uint16 RW % ×0.1
HR 13 uint16 RW % ×0.1
HR 14 uint16 RW
HR 15 uint16 RW s
HR 16 uint16 RW s
HR 17 uint16 RW s
HR 18 uint16 RW s
HR 19 uint16 RW s
HR 20 uint16 RW s
HR 21 uint16 RW s
HR 22 uint16 RW
HR 23 uint16 RW V ×0.1 −25
HR 24 uint16 RW V ×0.1 −25
HR 25 uint16 RW % ×0.1
HR 26 uint16 RW % ×0.1
HR 40 uint16 RW V ×0.1
HR 41 uint16 RW % ×0.1
HR 42 uint16 RW % ×0.1
HR 43 uint16 RW % ×0.1
HR 44 uint16 RW
HR 45 uint16 RW s
HR 46 uint16 RW s
HR 47 uint16 RW s
HR 48 uint16 RW s
HR 49 uint16 RW s
HR 50 uint16 RW s
HR 51 uint16 RW s
HR 52 uint16 RW
HR 53 uint16 RW V ×0.1 −25
HR 54 uint16 RW V ×0.1 −25
HR 55 uint16 RW % ×0.1
HR 56 uint16 RW % ×0.1
HR 57 uint16 RW
HR 58 uint16 RW
HR 59 uint16 RW
HR 60 uint16 RW
HR 61 uint16 RW
HR 62 uint16 RW
HR 70 uint16 RW V ×0.1
HR 71 uint16 RW % ×0.1
HR 72 uint16 RW % ×0.1
HR 73 uint16 RW % ×0.1
HR 74 uint16 RW
HR 75 uint16 RW s
HR 76 uint16 RW s
HR 77 uint16 RW s
HR 78 uint16 RW s
HR 79 uint16 RW s
HR 80 uint16 RW s
HR 81 uint16 RW s
HR 82 uint16 RW
HR 83 uint16 RW V ×0.1 −25
HR 84 uint16 RW V ×0.1 −25
HR 85 uint16 RW % ×0.1
HR 86 uint16 RW % ×0.1
HR 87 uint16 RW
HR 88 uint16 RW
HR 89 uint16 RW
HR 90 uint16 RW
HR 91 uint16 RW
HR 92 uint16 RW
HR 100 uint16 RW V ×0.1
HR 101 uint16 RW % ×0.1
HR 102 uint16 RW % ×0.1
HR 103 uint16 RW % ×0.1
HR 104 uint16 RW
HR 105 uint16 RW s
HR 106 uint16 RW s
HR 107 uint16 RW s
HR 108 uint16 RW s
HR 109 uint16 RW s
HR 110 uint16 RW s
HR 111 uint16 RW s
HR 112 uint16 RW
HR 113 uint16 RW V ×0.1 −25
HR 114 uint16 RW V ×0.1 −25
HR 115 uint16 RW % ×0.1
HR 116 uint16 RW % ×0.1
HR 117 uint16 RW
HR 118 uint16 RW
HR 119 uint16 RW
HR 120 uint16 RW
HR 121 uint16 RW
HR 122 uint16 RW
HR 130 uint16 RW V ×0.1
HR 131 uint16 RW % ×0.1
HR 132 uint16 RW % ×0.1
HR 133 uint16 RW % ×0.1
HR 134 uint16 RW

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