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Treetech AVR Modbus register map

Voltage regulator relay for transformer tap changers: tap position, load voltage, current, power, regulation state, alarms, relays and maintenance counters

  • Official
  • 210 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
0-based

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

Map

Registers
54 holding registers, 40 input registers, 20 coils, 96 discrete inputs
Groups
12
Translation tables
14
Revision
1 · 2026-11-10
Firmware
1.02 r1
Added
()
File
maps/treetech/avr.mbmap.json · 36 KB · history
SHA-256
1fd1a9d336a6431eff7181d0502830981bd28ea08b9e23d49a2272dc09860909
Manufacturer
treetech.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 input 45000 uint32 ABCD

Sources and notes

Source: Treetech AVR Mapa de Protocolos de Comunicação MAP-103, rev. 1.00

  • 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 lists every value as a 16-bit word without stating a scale. Scales are applied where the documented range makes them clear (frequency, angles, power factor, VT voltage) or where the TMV / SDV / SDT document (MAP-013) lists the same register with an engineering range; those descriptions say so. The line current stays raw.
  • Left out: the regulation sets (registers 20100 to 20620 and coils 20100 to 20601), the relay-to-alarm association coils, the password and mass-memory registers, the 48-bit timestamp, the tap changer rated current (21305, whose range differs from the TMV document) and the squared-current limits in 21404 to 21408.
  • The document was written for firmware 1.02 r1. Written from that document; this map has not been tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 300 uint16 RW Number of taps the tap changer has
HR 301 uint16 RW
HR 302 uint16 RW ohm ×0.1 Range 47 to 200, read as tenths (the TMV document lists the same register as 4.7 to 20)
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 320 uint16 RW
HR 400 uint16 RW
HR 500 uint16 RW
HR 501 uint16 RW
HR 502 uint16 RW Applied with the key in register 505
HR 503 uint16 RW ms
HR 504 uint16 RW ms
HR 506 uint16 RW
HR 507 uint16 RW
HR 508 uint16 RW Applied with the key in register 511
HR 509 uint16 RW ms
HR 510 uint16 RW ms
HR 20000 uint16 RW %
HR 20001 uint16 RW s
HR 20002 uint16 RW %
HR 20003 uint16 RW s
HR 20004 uint16 RW %
HR 20005 uint16 RW s
HR 20006 uint16 RW
HR 20007 uint16 RW
HR 20008 uint16 RW
HR 20009 uint16 RW
HR 20010 uint16 RW s
HR 21100 uint16 RW
HR 21101 uint16 RW MVA ×0.1 Range 0 to 9999, read as tenths (as in the TMV document)
HR 21102 uint16 RW kA ×0.01 Range 1 to 65535, read as hundredths (as in the TMV document)
HR 21103 uint16 RW
HR 21104 uint16 RW
HR 21200 uint16 RW Attempts before the tap changer regulation failure alarm
HR 21201 uint16 RW
HR 21303 uint16 RW days Days used for the average number of operations
HR 21304 uint16 RW days
HR 21310 uint16 RW
HR 21400 uint32 ABCD RW
HR 21402 uint32 ABCD RW
IR 0 uint16 R
IR 300 int16 R Range -49 to 49
IR 301 int16 R
IR 302 int16 R
IR 303 int16 R
IR 304 uint16 R
IR 20000 int16 R % ×0.1 Scale from the TMV document, which lists the same register as -3276.8 to 3276.7
IR 20001 int16 R MW ×0.1 Scale from the TMV document
IR 20002 int16 R MVAR ×0.1 Scale from the TMV document
IR 20003 int16 R MVA ×0.1 Scale from the TMV document
IR 20004 uint16 R % ×0.1 Range 0 to 5000, read as tenths (as in the TMV document)
IR 20005 uint16 R V ×0.1 Range 0 to 2400; the 0.1 scale is read from that range
IR 20006 uint16 R A ×0.01 Range 0 to 1500, read as hundredths (as in the TMV document)
IR 20007 uint16 R ° ×0.1 Range 0 to 3599, read as tenths of a degree
IR 20008 uint16 R Hz ×0.01 Range 0 to 6200, read as hundredths of a hertz
IR 20009 uint16 R kV ×0.01 Read as hundredths (as in the TMV document)
IR 20010 uint16 R kV ×0.01 Read as hundredths (as in the TMV document)
IR 20011 uint16 R A Raw value; this document says A, while the TMV document lists the same register as 0 to 6553.5 kA
IR 20012 uint16 R ×0.001 Range 0 to 1000, read as thousandths
IR 20013 uint16 R % Raw value; the document gives no scale
IR 20014 uint16 R ° ×0.1 Range 0 to 3599, read as tenths of a degree
IR 20015 uint16 R Range 1 to 10
IR 21300 uint16 R ops/day ×0.1 Read as tenths (as in the TMV document)
IR 21301 uint16 R days
IR 21302 uint16 R x10³ pu²/day ×0.1 Read as tenths (as in the TMV document)
IR 21303 uint16 R days
IR 45000 uint32 ABCD R
IR 45002 uint16 R Lower board
IR 45003 uint16 R Lower board
IR 45004 uint16 R Lower board
IR 45005 uint16 R Lower board
IR 45006 uint16 R
IR 45007 uint16 R
IR 45100 int16 R h
IR 45101 uint16 R
IR 45102 uint16 R
IR 45103 uint16 R
IR 45104 uint16 R
IR 45105 uint16 R
IR 45106 uint16 R
CO 1 bool W Write 1 to reset
CO 2 bool W Write 1 to reset
CO 3 bool W Write 1 to reset
CO 4 bool W Write 1 to reset
CO 100 bool RW
CO 101 bool RW

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