MBMap Registry
  1. Devices
  2. Altus
  3. PH3500

Altus PH3500 Modbus register map

Power quality analyzer: instantaneous voltages, currents, powers, power factor and frequency, demand, energy, statistics, and communication and system settings

  • Official
  • 125 registers
  • Modbus TCP and 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 TCP and RTU
Unit ID
1
TCP port
502default
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
28 holding registers, 97 input registers
Groups
5
Translation tables
15
Revision
1 · 2026-11-10
Added
()
File
maps/altus/ph3500.mbmap.json · 22 KB · history
SHA-256
671b30f31872f08009db2353d067413276a034c5159683980114c11f6b7bc66c
Manufacturer
altus.com.br

Sources and notes

  • PH3500 Multimedidor, Manual de Utilização (MU821006) · version Rev. B 08/2022, 2022-08
    linked in issue #117; chapter 8 (Protocolos de Comunicação), Tabela de Registros

Source: PH3500 Multimedidor, Manual de Utilização, Rev. B 08/2022

  • Modbus RTU on the RS-485 port (D+ and D-, default 19200 bit/s, 8-N-1, address 1 to 247) and Modbus TCP on the Ethernet port (the port is set in the device; 502 is assumed). Functions 01, 03, 04, 05, 06, 16 and 17 are described; the manual also describes extended functions (such as 0x33 and 0x34) that are not used here.
  • The manual has two address columns, Short and Long, chosen by the device setting COM - Modbus 32-bit mode (holding register 1: 0 = Short, 1 = Long). This map uses the Short column, the setting 0, where 32-bit values (floats, Long, DateTime) take two registers and the addresses are 2 apart. In Long mode every 32-bit value is one register at the address of the Long column and the byte layout is different, so this map does not fit it. The manual does not say which mode is the factory default: if the values look wrong, read holding register 1.
  • The byte and word swap (holding registers 2 and 3) default to none (ABCD, big-endian). The manual does not state the factory values. If a swap is set, change byte_order and word_order here. The tables are 0-based, as the manual says.
  • The manual's Long type is an unsigned 32-bit integer, Float is IEEE 754 (NaN is 0x7FC00000), DateTime is seconds since 1970-01-01 UTC, and CaracFP and Fase are signed small codes in a 32-bit register: CaracFP -1 none, 0 resistive, 1 inductive, 2 capacitive; Fase -1 none, 0 A or AB, 1 B or BC, 2 C or CA.
  • Not included: coils, the Ethernet address characters, the datalog and event areas, the digital input and output counters, and the rest of the statistics block. Several tables in the manual repeat rows, and the manual says writable registers have no protection against invalid values.
  • Written from the manufacturer's manual; not tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
HR 0 uint16 RW Modbus network address
HR 1 uint16 RW Short = 16-bit addressing (this map), Long = 32-bit addressing
HR 2 uint16 RW
HR 3 uint16 RW
HR 4 uint16 RW RS-485 baud rate in bit/s
HR 5 uint16 RW
HR 10 uint16 RW
HR 11 uint16 RW
HR 13 uint16 RW
HR 14 uint16 RW Wiring configuration; labels as printed in the manual (entries 02 and 03, and 15 and 16, are labelled the same)
HR 15 uint16 RW
HR 16 uint16 RW
HR 17 uint16 RW
HR 18 uint16 RW
HR 19 uint16 RW
HR 20 uint16 RW
HR 21 uint16 RW
HR 22 uint16 RW
HR 23 uint16 RW Interval in minutes
HR 40 uint16 RW
HR 41 uint16 RW
HR 200 uint32 ABCD RW V
HR 202 uint32 ABCD RW V
HR 204 float32 ABCD RW
HR 206 uint32 ABCD RW A
HR 208 uint32 ABCD RW A
HR 210 float32 ABCD RW
HR 214 uint32 ABCD RW s Interval between logged records
IR 0 uint32 ABCD R Time of the measurement, seconds since 1970-01-01 UTC
IR 2 float32 ABCD R V
IR 4 float32 ABCD R V
IR 6 float32 ABCD R V
IR 8 float32 ABCD R V
IR 10 float32 ABCD R A
IR 12 float32 ABCD R A
IR 14 float32 ABCD R A
IR 16 float32 ABCD R A
IR 18 float32 ABCD R V
IR 20 float32 ABCD R V
IR 22 float32 ABCD R V
IR 24 float32 ABCD R V
IR 26 float32 ABCD R
IR 28 float32 ABCD R
IR 30 float32 ABCD R
IR 32 float32 ABCD R
IR 34 int32 ABCD R
IR 36 int32 ABCD R
IR 38 int32 ABCD R
IR 40 int32 ABCD R
IR 42 float32 ABCD R W
IR 44 float32 ABCD R W
IR 46 float32 ABCD R W
IR 48 float32 ABCD R W
IR 50 float32 ABCD R VAr
IR 52 float32 ABCD R VAr
IR 54 float32 ABCD R VAr
IR 56 float32 ABCD R VAr
IR 58 float32 ABCD R VA
IR 60 float32 ABCD R VA
IR 62 float32 ABCD R VA
IR 64 float32 ABCD R VA
IR 66 float32 ABCD R Hz
IR 68 float32 ABCD R
IR 70 float32 ABCD R
IR 72 float32 ABCD R
IR 74 float32 ABCD R A
IR 76 int32 ABCD R
IR 78 float32 ABCD R °
IR 80 float32 ABCD R °
IR 82 float32 ABCD R °
IR 200 float32 ABCD R W
IR 202 float32 ABCD R W
IR 204 float32 ABCD R W
IR 206 float32 ABCD R VAr
IR 208 float32 ABCD R VAr
IR 210 float32 ABCD R VAr
IR 212 float32 ABCD R VAr
IR 214 float32 ABCD R VAr
IR 216 float32 ABCD R VAr
IR 218 float32 ABCD R VAr
IR 220 float32 ABCD R VAr
IR 222 float32 ABCD R VAr
IR 224 float32 ABCD R VA
IR 226 float32 ABCD R VA
IR 228 float32 ABCD R VA
IR 300 float32 ABCD R kWh
IR 302 float32 ABCD R kWh
IR 304 float32 ABCD R kWh
IR 306 float32 ABCD R kWh
IR 308 float32 ABCD R kvarh
IR 310 float32 ABCD R kvarh
IR 312 float32 ABCD R kvarh
IR 314 float32 ABCD R kvarh
IR 316 float32 ABCD R kvarh
IR 318 float32 ABCD R kvarh
IR 320 float32 ABCD R kvarh
IR 322 float32 ABCD R kvarh
IR 324 float32 ABCD R kVAh
IR 360 float32 ABCD R V
IR 362 float32 ABCD R V

Help improve this map

Esc