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  2. Electron do Brasil
  3. GRIDSCAN 5000

Electron do Brasil GRIDSCAN 5000 Modbus register map

Transformer hydrogen and oil temperature sensor with Modbus RTU

  • Official
  • 57 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
19200 8N1 · 19200 baud, 8 data bits, none parity, 1 stop bit
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
57 holding registers
Groups
7
Translation tables
6
Revision
1 · 2026-11-10
Added
()
File
maps/electron/gdscan-5000.mbmap.json · 13 KB · history
SHA-256
a377730b978323e6b33a1fe19af65eaab03b8297fdc04324a8172f5a10302376
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 Product serial number holding 41 string[10]

Sources and notes

Source: Electron do Brasil, Mapa de Registradores MODBUS RTU, GRIDSCAN 5000, v1.0

  • Addresses are the register numbers of the document, which starts at 0 (hydrogen at registers 0 and 1), so address_base is 0. The document lists them as holding registers (function 03).
  • Default connection from the document: 19200 baud, 8 data bits, no parity, 1 stop bit (the framing register also allows 2 stop bits, even and odd parity), RS-485 two-wire, unit ID 1. Set the master timeout to 10 seconds or more.
  • 32-bit values (hydrogen, rates, calibration values) are read with the high word first. The document asks to read the high word before the low word: read both registers in one request.
  • Strings are ASCII, two characters per register, up to 19 characters, null-terminated. Dates are packed as month and day in one register (high and low byte) and the year in the next.
  • The document also describes discrete inputs (function 02, addresses 0 to 67) that repeat the status bits and mark which values are valid; they are not mapped here.
  • The document also says input registers 0 to 14 exist, but gives no table for them, so only holding registers are mapped.
  • Written from the manufacturer's document; not tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 0 uint32 ABCD R ppm Dissolved hydrogen in ppm H2, unscaled. Read the high word (register 0) first; the value is 0 until the ready bit of the unit status is set
HR 7 uint16 R °C ×0.01 −100 Internal temperature of the electronics; above 105 °C can damage the device
HR 8 uint16 R °C ×0.01 −100 0 until the first measurement; the sensor is calibrated up to 105 °C
HR 13 uint32 ABCD R ppm/day −20000000 Raw value is stored with an offset of 20,000,000; negative means falling hydrogen. Trends reset to zero after a power cycle
HR 15 uint32 ABCD R ppm/week −20000000 Raw value is stored with an offset of 20,000,000; negative means falling hydrogen. Trends reset to zero after a power cycle
HR 17 uint32 ABCD R ppm/month −20000000 Raw value is stored with an offset of 20,000,000; negative means falling hydrogen. Trends reset to zero after a power cycle
HR 31 string[10] R
HR 41 string[10] R
HR 51 string[10] R
HR 61 string[10] R
HR 81 uint16 bits 8–15 R
HR 81 uint16 bits 0–7 R
HR 82 uint16 R
HR 83 uint16 bits 8–15 R
HR 83 uint16 bits 0–7 R
HR 84 uint16 R
HR 87 uint16 bits 8–15 R
HR 87 uint16 bits 0–7 R
HR 88 uint16 R
HR 89 string[10] R Text in the form x:y:z (major, minor, product designator), for example 3:7:A
HR 111 bool bit 15 R Hydrogen readings are valid
HR 111 bool bit 14 R Cleared by reading the register
HR 111 bool bit 12 R An unrecoverable error occurred; see registers 112 and 113
HR 111 uint16 bits 3–5 R
HR 112 bool bit 15 R
HR 112 bool bit 14 R
HR 112 bool bit 13 R
HR 113 bool bit 8 R Cleared by setting the clock or cycling the power
HR 113 bool bit 4 R
HR 113 bool bit 1 R
HR 113 bool bit 0 R
HR 121 uint16 RW First step of the DGA adjustment: write when an oil sample is taken. Not within 24 hours of installation or of the last DC command. The document gives no value to write
HR 122 uint16 RW Second step: write after registers 126 to 129 are set. Needs a prior DA and takes up to 10 seconds to answer. The document gives no value to write
HR 125 uint16 RW Clears the DGA adjustment. The document gives no value to write
HR 126 uint32 ABCD RW ppm Laboratory hydrogen result, written before command DB
HR 128 uint16 bits 8–15 RW The date must match the internal clock for command DB to be accepted
HR 128 uint16 bits 0–7 RW
HR 129 uint16 RW
HR 136 string[8] RW Up to 15 characters, null-terminated
HR 144 uint32 ABCD RW ×0.000001 −0.001 Stored as m x 1,000,000 + 1,000 (default 1093 for synthetic ester). A wrong value disables hydrogen measurement
HR 146 uint32 ABCD RW ×0.000001 −0.001 Stored as b x 1,000,000 + 1,000 (default 40739 for synthetic ester). A wrong value disables hydrogen measurement
HR 148 uint16 RW Write 1 to open the user-defined type for editing, then 2 to save or 3 to abort
HR 150 uint16 RW Writing to unit 0 reaches every connected device. The new ID applies after a power cycle
HR 151 uint16 RW Laboratory mode runs the self-calibration every 4 hours instead of every 12
HR 152 uint16 RW
HR 159 uint16 RW Applies after a power cycle
HR 160 uint16 RW
HR 175 uint16 bits 8–15 RW Read register 175 first; write 175 to 178 in order, the clock is saved when 178 is written
HR 175 uint16 bits 0–7 RW +2000 Year minus 2000 in the register
HR 176 uint16 bits 8–15 RW
HR 176 uint16 bits 0–7 RW
HR 177 uint16 bits 8–15 RW
HR 177 uint16 bits 0–7 RW
HR 178 uint16 RW Write 0
HR 201 string[10] RW Up to 19 characters; read from the lowest address, write all registers to save
HR 211 string[10] RW
HR 221 string[10] RW

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