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Treetech TMV Modbus register map

Also covers SDV, SDT

Transformer temperature monitor and tap changer voltage regulator: oil and winding temperatures, ageing, cooling, OLTC differential, tap position, regulation sets, alarms and tap changer maintenance

  • Official
  • 850 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.

Download .mbmap.json Raw JSON View on GitHub Suggest a correction Report a problem

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
0-based

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

Map

Registers
367 holding registers, 107 input registers, 93 coils, 283 discrete inputs
Groups
36
Translation tables
38
Revision
1 · 2026-11-10
Firmware
1.11 R22
Added
()
File
maps/treetech/tmv-sdv-sdt.mbmap.json · 148 KB · history
SHA-256
5fbb6eb33142012bc0aef88b79fe9d2d24f196d018e3c40e5303b23da935a08b
Manufacturer
treetech.com.br

Sources and notes

Source: Treetech TMV / SDV / SDT Mapa de Protocolos de Comunicação MAP-013, rev. 1.10

  • Modbus RTU on RS-485, FC01 to FC06, FC15 and FC16. Addresses are 0-based, as sent on the wire.
  • Baud rate is selectable (4800 to 115200 bit/s), 8 data bits, no parity, 1 or 2 stop bits (detected automatically). The document gives no factory default for the baud rate or the address; 9600 and 1 are assumed here.
  • The document is a spreadsheet that lists engineering ranges, not raw ranges. Scales are taken from ranges that have decimals (for example -99.9 to 999.9 is tenths). For the VT voltage, CT current, frequency, power factor and load percentage the range is whole numbers, and the scale is taken from the AVR document, which lists the same registers with larger raw ranges; check these against the display.
  • Left out: the SPS node blocks (holding 600 to 2313, discrete 600 to 2310), the relay association coils, the hot-spot factor and 2M exponent settings and the paper moisture settings (their scales are not clear), the 48-bit timestamps, the tap changer rated current (21305) and the squared-current limits in 21404 to 21408.
  • Registers 500 to 507 and the bank/transformer blocks only apply when the device is set up as a parallelism concentrator. Winding 2 and 3 values only apply when the device has that many windings (holding 10202).
  • The document applies to firmware 1.11 R22. Written from that document; this map has not been tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 0 uint16 RW
HR 1 uint16 RW min
HR 3 uint16 RW min
HR 4 uint16 RW °C Oil temperature change that triggers a mass memory record
HR 100 int16 RW ×0.1 Range -99.9 to 999.9, read as tenths
HR 101 int16 RW ×0.1 Range -99.9 to 999.9, read as tenths
HR 108 uint16 RW
HR 109 uint16 RW
HR 102 int16 RW ×0.1 Range -99.9 to 999.9, read as tenths
HR 103 int16 RW ×0.1 Range -99.9 to 999.9, read as tenths
HR 110 uint16 RW
HR 111 uint16 RW
HR 104 int16 RW ×0.1 Range -99.9 to 999.9, read as tenths
HR 105 int16 RW ×0.1 Range -99.9 to 999.9, read as tenths
HR 112 uint16 RW
HR 113 uint16 RW
HR 106 int16 RW ×0.1 Range -99.9 to 999.9, read as tenths
HR 107 int16 RW ×0.1 Range -99.9 to 999.9, read as tenths
HR 114 uint16 RW
HR 115 uint16 RW
HR 200 uint16 RW
HR 201 uint16 RW
HR 202 uint16 RW ms
HR 300 uint16 RW Number of taps the tap changer has
HR 301 uint16 RW
HR 302 uint16 RW ohm ×0.1 Range 4.7 to 20, read as tenths
HR 303 uint16 RW s Time the tap changer takes for a complete tap change
HR 304 uint16 RW Counted from the start of the measuring range
HR 305 uint16 RW
HR 306 uint16 RW
HR 307 uint16 RW
HR 308 uint16 RW
HR 309 uint16 RW
HR 310 uint16 RW
HR 311 uint16 RW
HR 312 uint16 RW
HR 313 uint16 RW
HR 314 uint16 RW
HR 315 uint16 RW
HR 316 uint16 RW
HR 317 int16 RW °C
HR 318 int16 RW °C
HR 319 uint16 RW ohm The document gives the range as whole ohms
HR 320 uint16 RW
HR 400 uint16 RW
HR 401 uint16 RW
HR 402 uint16 RW
HR 500 uint16 RW
HR 10000 uint16 RW Sensor used for the oil temperature
HR 10001 uint16 RW
HR 10002 uint16 RW °C
HR 10100 int16 RW °C
HR 10101 int16 RW °C
HR 10102 uint16 RW min
HR 10103 uint16 RW
HR 10104 uint16 RW
HR 10105 uint16 RW
HR 10202 uint16 RW
HR 10200 int16 RW °C
HR 10201 int16 RW °C
HR 10203 uint16 RW s
HR 10205 uint16 RW
HR 10206 uint16 RW
HR 10207 uint16 RW
HR 10214 uint16 RW °C
HR 10215 uint16 RW °C
HR 10216 uint16 RW °C
HR 10217 uint16 RW
HR 10300 uint32 ABCD RW kA ×0.01 Range 0 to 99.99 kA, read as hundredths
HR 10302 uint32 ABCD RW kA ×0.01 Range 0 to 99.99 kA, read as hundredths
HR 10304 uint32 ABCD RW kA ×0.01 Range 0 to 99.99 kA, read as hundredths
HR 10400 int16 RW °C
HR 10401 int16 RW °C
HR 10402 uint16 RW s
HR 10404 uint16 RW
HR 10405 uint16 RW
HR 10406 uint16 RW
HR 10413 uint16 RW °C
HR 10414 uint16 RW °C
HR 10415 uint16 RW °C
HR 10416 uint16 RW
HR 10500 uint32 ABCD RW kA ×0.01 Range 0 to 99.99 kA, read as hundredths
HR 10502 uint32 ABCD RW kA ×0.01 Range 0 to 99.99 kA, read as hundredths
HR 10504 uint32 ABCD RW kA ×0.01 Range 0 to 99.99 kA, read as hundredths
HR 10600 int16 RW °C
HR 10601 int16 RW °C
HR 10602 uint16 RW s
HR 10604 uint16 RW
HR 10605 uint16 RW
HR 10606 uint16 RW
HR 10613 uint16 RW °C
HR 10614 uint16 RW °C
HR 10615 uint16 RW °C
HR 10616 uint16 RW
HR 10700 uint32 ABCD RW kA ×0.01 Range 0 to 99.99 kA, read as hundredths
HR 10702 uint32 ABCD RW kA ×0.01 Range 0 to 99.99 kA, read as hundredths
HR 10704 uint32 ABCD RW kA ×0.01 Range 0 to 99.99 kA, read as hundredths
HR 10800 int16 RW °C
HR 10801 int16 RW °C ×0.1 Range -5.5 to 20, read as tenths
HR 10802 int16 RW °C ×0.1 Range -5.5 to 20, read as tenths

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