ORNO OR-WE-529 three-phase energy meter — ESPHome config + Modbus register map (Waveshare ESP32-S3-RS485-CAN)

energy-heatpump.yaml

esphome:
  name: energy-heatpump
  friendly_name: Energy HeatPump
  area: Boilerroom
  on_boot:
    priority: -100
    then:
      - lambda: id(orno_we529)->update();

packages:
  base: !include __common/base.yaml
  logger: !include __common/logger.yaml

esp32:
  board: esp32-s3-devkitc-1
  framework:
    type: esp-idf

logger:
  level: INFO
  baud_rate: 0

time:
  - platform: homeassistant
    id: homeassistant_time

uart:
  - id: modbus_uart
    tx_pin: GPIO17
    rx_pin: GPIO18
    baud_rate: 9600
    parity: NONE
    stop_bits: 1

modbus:
  id: modbus_1
  uart_id: modbus_uart
  flow_control_pin: GPIO21

modbus_controller:
  - id: orno_we529
    address: 0x01
    modbus_id: modbus_1
    setup_priority: -10
    update_interval: 10s

button:
  - platform: template
    name: "Reset Resettable Energy"
    icon: mdi:counter
    entity_category: config
    on_press:
      - lambda: |-
          auto cmd = esphome::modbus_controller::ModbusCommandItem
            ::create_write_single_command(id(orno_we529), 0x2001, 0x3FFF);
          id(orno_we529)->queue_command(cmd);

  - platform: template
    name: "Reset Max Demand"
    icon: mdi:chart-bar
    entity_category: config
    on_press:
      - lambda: |-
          auto cmd = esphome::modbus_controller::ModbusCommandItem
            ::create_write_single_command(id(orno_we529), 0x2002, 0xFFA5);
          id(orno_we529)->queue_command(cmd);

sensor:

  # ── Voltages ────────────────────────────────────────────────────────────────

  - id: l1_voltage
    name: "L1 Voltage"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0400
    value_type: S_DWORD
    unit_of_measurement: "V"
    device_class: voltage
    state_class: measurement
    accuracy_decimals: 2
    filters:
      - multiply: 0.001

  - id: l2_voltage
    name: "L2 Voltage"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0402
    value_type: S_DWORD
    unit_of_measurement: "V"
    device_class: voltage
    state_class: measurement
    accuracy_decimals: 2
    filters:
      - multiply: 0.001

  - id: l3_voltage
    name: "L3 Voltage"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0404
    value_type: S_DWORD
    unit_of_measurement: "V"
    device_class: voltage
    state_class: measurement
    accuracy_decimals: 2
    filters:
      - multiply: 0.001

  # ── Currents ─────────────────────────────────────────────────────────────────

  - id: l1_current
    name: "L1 Current"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0410
    value_type: S_DWORD
    unit_of_measurement: "A"
    device_class: current
    state_class: measurement
    accuracy_decimals: 2
    filters:
      - multiply: 0.001

  - id: l2_current
    name: "L2 Current"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0412
    value_type: S_DWORD
    unit_of_measurement: "A"
    device_class: current
    state_class: measurement
    accuracy_decimals: 2
    filters:
      - multiply: 0.001

  - id: l3_current
    name: "L3 Current"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0414
    value_type: S_DWORD
    unit_of_measurement: "A"
    device_class: current
    state_class: measurement
    accuracy_decimals: 2
    filters:
      - multiply: 0.001

  # ── Active Power ─────────────────────────────────────────────────────────────

  - id: l1_active_power
    name: "L1 Active Power"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x041A
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 0

  - id: l2_active_power
    name: "L2 Active Power"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x041C
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 0

  - id: l3_active_power
    name: "L3 Active Power"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x041E
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 0

  - id: total_active_power
    name: "Total Active Power"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0420
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 0

  # ── Apparent Power ───────────────────────────────────────────────────────────

  - id: l1_apparent_power
    name: "L1 Apparent Power"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0422
    value_type: S_DWORD
    unit_of_measurement: "VA"
    device_class: apparent_power
    state_class: measurement
    accuracy_decimals: 0

  - id: l2_apparent_power
    name: "L2 Apparent Power"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0424
    value_type: S_DWORD
    unit_of_measurement: "VA"
    device_class: apparent_power
    state_class: measurement
    accuracy_decimals: 0

  - id: l3_apparent_power
    name: "L3 Apparent Power"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0426
    value_type: S_DWORD
    unit_of_measurement: "VA"
    device_class: apparent_power
    state_class: measurement
    accuracy_decimals: 0

  - id: total_apparent_power
    name: "Total Apparent Power"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0428
    value_type: S_DWORD
    unit_of_measurement: "VA"
    device_class: apparent_power
    state_class: measurement
    accuracy_decimals: 0

  # ── Reactive Power ───────────────────────────────────────────────────────────

  - id: l1_reactive_power
    name: "L1 Reactive Power"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x042A
    value_type: S_DWORD
    unit_of_measurement: "var"
    device_class: reactive_power
    state_class: measurement
    accuracy_decimals: 0

  - id: l2_reactive_power
    name: "L2 Reactive Power"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x042C
    value_type: S_DWORD
    unit_of_measurement: "var"
    device_class: reactive_power
    state_class: measurement
    accuracy_decimals: 0

  - id: l3_reactive_power
    name: "L3 Reactive Power"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x042E
    value_type: S_DWORD
    unit_of_measurement: "var"
    device_class: reactive_power
    state_class: measurement
    accuracy_decimals: 0

  - id: total_reactive_power
    name: "Total Reactive Power"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0430
    value_type: S_DWORD
    unit_of_measurement: "var"
    device_class: reactive_power
    state_class: measurement
    accuracy_decimals: 0

  # ── Frequency ────────────────────────────────────────────────────────────────

  - id: frequency
    name: "Frequency"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0432
    value_type: S_WORD
    unit_of_measurement: "Hz"
    device_class: frequency
    state_class: measurement
    accuracy_decimals: 1
    filters:
      - multiply: 0.1

  # ── Power Factors ────────────────────────────────────────────────────────────

  - id: l1_power_factor
    name: "L1 Power Factor"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0436
    value_type: S_WORD
    device_class: power_factor
    state_class: measurement
    accuracy_decimals: 3
    filters:
      - multiply: 0.001

  - id: l2_power_factor
    name: "L2 Power Factor"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0437
    value_type: S_WORD
    device_class: power_factor
    state_class: measurement
    accuracy_decimals: 3
    filters:
      - multiply: 0.001

  - id: l3_power_factor
    name: "L3 Power Factor"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0438
    value_type: S_WORD
    device_class: power_factor
    state_class: measurement
    accuracy_decimals: 3
    filters:
      - multiply: 0.001

  - id: total_power_factor
    name: "Total Power Factor"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0439
    value_type: S_WORD
    device_class: power_factor
    state_class: measurement
    accuracy_decimals: 3
    filters:
      - multiply: 0.001

  # ── Energy — Totals ──────────────────────────────────────────────────────────

  - id: total_forward_active_energy
    name: "Total Forward Active Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x010E
    value_type: S_DWORD
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - id: total_reverse_active_energy
    name: "Total Reverse Active Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0118
    value_type: S_DWORD
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - id: total_active_energy
    name: "Total Active Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0122
    value_type: S_DWORD
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - id: total_forward_reactive_energy
    name: "Total Forward Reactive Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x012C
    value_type: S_DWORD
    unit_of_measurement: "kvarh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - id: total_reverse_reactive_energy
    name: "Total Reverse Reactive Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0136
    value_type: S_DWORD
    unit_of_measurement: "kvarh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  # ── Daily Energy ─────────────────────────────────────────────────────────────

  - platform: total_daily_energy
    name: "Daily Energy"
    power_id: total_active_power
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 3
    filters:
      - multiply: 0.001

  - platform: total_daily_energy
    name: "L1 Daily Energy"
    power_id: l1_active_power
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 3
    filters:
      - multiply: 0.001

  - platform: total_daily_energy
    name: "L2 Daily Energy"
    power_id: l2_active_power
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 3
    filters:
      - multiply: 0.001

  - platform: total_daily_energy
    name: "L3 Daily Energy"
    power_id: l3_active_power
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 3
    filters:
      - multiply: 0.001

  # ── Max Demand ───────────────────────────────────────────────────────────────

  - id: forward_active_max_demand
    name: "Forward Active Max Demand"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0470
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 1
    filters:
      - multiply: 0.1

  - id: reverse_active_max_demand
    name: "Reverse Active Max Demand"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0478
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 1
    filters:
      - multiply: 0.1

  - id: total_active_max_demand
    name: "Total Active Max Demand"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0480
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 1
    filters:
      - multiply: 0.1

  - id: l1_forward_active_max_demand
    name: "L1 Forward Active Max Demand"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x046A
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 1
    filters:
      - multiply: 0.1

  - id: l2_forward_active_max_demand
    name: "L2 Forward Active Max Demand"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x046C
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 1
    filters:
      - multiply: 0.1

  - id: l3_forward_active_max_demand
    name: "L3 Forward Active Max Demand"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x046E
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 1
    filters:
      - multiply: 0.1

  - id: l1_total_active_max_demand
    name: "L1 Total Active Max Demand"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x047A
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 1
    filters:
      - multiply: 0.1

  - id: l2_total_active_max_demand
    name: "L2 Total Active Max Demand"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x047C
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 1
    filters:
      - multiply: 0.1

  - id: l3_total_active_max_demand
    name: "L3 Total Active Max Demand"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x047E
    value_type: S_DWORD
    unit_of_measurement: "W"
    device_class: power
    state_class: measurement
    accuracy_decimals: 1
    filters:
      - multiply: 0.1

  # ── Energy — Resettable ──────────────────────────────────────────────────────

  - id: resettable_active_energy
    name: "Resettable Active Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x062C
    value_type: S_DWORD
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - id: resettable_forward_active_energy
    name: "Resettable Forward Active Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x062E
    value_type: S_DWORD
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - id: l1_resettable_active_energy
    name: "L1 Resettable Active Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0632
    value_type: S_DWORD
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - id: l2_resettable_active_energy
    name: "L2 Resettable Active Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0638
    value_type: S_DWORD
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - id: l3_resettable_active_energy
    name: "L3 Resettable Active Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x063E
    value_type: S_DWORD
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  # ── Energy — Per Phase ───────────────────────────────────────────────────────

  - id: l1_total_active_energy
    name: "L1 Total Active Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0500
    value_type: S_DWORD
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - id: l2_total_active_energy
    name: "L2 Total Active Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x0564
    value_type: S_DWORD
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

  - id: l3_total_active_energy
    name: "L3 Total Active Energy"
    platform: modbus_controller
    modbus_controller_id: orno_we529
    register_type: holding
    address: 0x05C8
    value_type: S_DWORD
    unit_of_measurement: "kWh"
    device_class: energy
    state_class: total_increasing
    accuracy_decimals: 2
    filters:
      - multiply: 0.01

orno-we529.md

OR-WE-529 Modbus Register Map

Completely reverse-engineered via live scanning + official XLSX register map from ORNO. Last updated: 2026-03-27

---

Hardware Setup

Component	Value
Board	Waveshare ESP32-S3-RS485-CAN
TX pin	GPIO17
RX pin	GPIO18
Flow control	GPIO21 (required)
RS485 terminals	A+ (pin 19), B- (pin 20)
Power supply	External DC (not USB) — required for RS485 reference

---

Communication Parameters

Parameter	Value
Baud rate	9600
Parity	NONE (8N1)
Stop bits	1
Modbus address	1 (default, range 1–247)
Function code reads	FC03 and FC04 — both return identical data
Function code writes	FC06 (single register), FC10h (multiple registers)

Note: Parity EVEN (used by OR-WE-516) does not work — meter does not respond.

---

Debugging Journey

The meter registers are at 0x0400+, not at the addresses used by other ORNO meters:

Meter	Voltage register	Type
OR-WE-516	0x000E	FP32
OR-WE-525/526	0x0100	INT32(3+3)
OR-WE-529	0x0400	INT32(3+3)

We exhaustively scanned 0x0000–0xA001 before receiving the official XLSX register map from ORNO. All ranges except 0x0400+ and 0x0100+ energy block return zeros.

---

Instantaneous Parameters (0x0400 range)

All registers: FC03, R/W=R, 2 registers (32-bit), S_DWORD.

Voltage — INT32(3+3), scale ÷1000, unit V

Address	ESPHome id	Description
0x0400	l1_voltage	L1-N Voltage
0x0402	l2_voltage	L2-N Voltage
0x0404	l3_voltage	L3-N Voltage
0x0406	—	L1-L2 Line Voltage
0x0408	—	L2-L3 Line Voltage
0x040A	—	L3-L1 Line Voltage
0x040C	—	L-N Average Voltage
0x040E	—	L-L Average Voltage

Current — INT32(2+3), scale ÷1000, unit A

Address	ESPHome id	Description
0x0410	l1_current	L1 Current
0x0412	l2_current	L2 Current
0x0414	l3_current	L3 Current
0x0416	—	N Current
0x0418	—	Three-phase Vector Sum Current

Active Power — INT32(5+0), scale ×1, unit W

Address	ESPHome id	Description
0x041A	l1_active_power	L1 Active Power
0x041C	l2_active_power	L2 Active Power
0x041E	l3_active_power	L3 Active Power
0x0420	total_active_power	Combined Active Power

Apparent Power — INT32(5+0), scale ×1, unit VA

Address	ESPHome id	Description
0x0422	l1_apparent_power	L1 Apparent Power
0x0424	l2_apparent_power	L2 Apparent Power
0x0426	l3_apparent_power	L3 Apparent Power
0x0428	total_apparent_power	Combined Apparent Power

Reactive Power — INT32(5+0), scale ×1, unit var

Address	ESPHome id	Description
0x042A	l1_reactive_power	L1 Reactive Power
0x042C	l2_reactive_power	L2 Reactive Power
0x042E	l3_reactive_power	L3 Reactive Power
0x0430	total_reactive_power	Combined Reactive Power

Frequency — INT16(2+1), scale ÷10, unit Hz

Address	ESPHome id	Description
0x0432	frequency	L1 Frequency
0x0433	—	L2 Frequency
0x0434	—	L3 Frequency
0x0435	—	Combined Frequency

Power Factor — INT16(1+3), scale ÷1000

Address	ESPHome id	Description
0x0436	l1_power_factor	L1 Power Factor
0x0437	l2_power_factor	L2 Power Factor
0x0438	l3_power_factor	L3 Power Factor
0x0439	total_power_factor	Combined Power Factor

Active Max Demand — INT32(6+1), scale ÷10, unit W

Address	ESPHome id	Description
0x046A	l1_forward_active_max_demand	L1 Forward Active Max Demand
0x046C	l2_forward_active_max_demand	L2 Forward Active Max Demand
0x046E	l3_forward_active_max_demand	L3 Forward Active Max Demand
0x0470	forward_active_max_demand	Combined Forward Active Max Demand
0x0472	—	L1 Reverse Active Max Demand
0x0474	—	L2 Reverse Active Max Demand
0x0476	—	L3 Reverse Active Max Demand
0x0478	reverse_active_max_demand	Combined Reverse Active Max Demand
0x047A	l1_total_active_max_demand	L1 Total Active Max Demand
0x047C	l2_total_active_max_demand	L2 Total Active Max Demand
0x047E	l3_total_active_max_demand	L3 Total Active Max Demand
0x0480	total_active_max_demand	Combined Total Active Max Demand

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Energy Parameters

All energy registers: FC03, R only, 2 registers (32-bit), S_DWORD, INT32(6+2), scale ÷100, unit kWh or kvarh.

Combined Energy (0x010E range)

Address	ESPHome id	Description
0x010E	total_forward_active_energy	Total Forward Active Energy (kWh)
0x0118	total_reverse_active_energy	Total Reverse Active Energy (kWh)
0x0122	total_active_energy	Total Active Energy (kWh)
0x012C	total_forward_reactive_energy	Total Forward Reactive Energy (kvarh)
0x0136	total_reverse_reactive_energy	Total Reverse Reactive Energy (kvarh)

Per-Phase Energy (0x0500 range)

Address	ESPHome id	Description
0x0500	l1_total_active_energy	L1 Total Active Energy (kWh)
0x0564	l2_total_active_energy	L2 Total Active Energy (kWh)
0x05C8	l3_total_active_energy	L3 Total Active Energy (kWh)

Resettable Energy (0x062C range)

state_class: total (not total_increasing — can be reset). Reset via register 0x2001.

Address	ESPHome id	Description
0x062C	resettable_active_energy	Total Resettable Active Energy (kWh)
0x062E	resettable_forward_active_energy	Resettable Forward Active Energy (kWh)
0x0632	l1_resettable_active_energy	L1 Resettable Active Energy (kWh)
0x0638	l2_resettable_active_energy	L2 Resettable Active Energy (kWh)
0x063E	l3_resettable_active_energy	L3 Resettable Active Energy (kWh)

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Meter Configuration Parameters (0x1000 range)

Address	R/W	Description	Known value
0x1000	R/W	Serial number (6 registers, FC10h)	—
0x1003	R/W	Modbus ID (1–247)	1
0x1004	R	SW version	301 (3.01)
0x1005	R	HW version	401 (4.01)
0x1006	R	FW checksum	0x5B61
0x1007	R/W	Time: year/month/day/week/hour/min/sec (4 registers, FC10h, BCD)	—
0x100B	R/W	LCD scroll time (0–99s, 0=disabled)	5
0x100C	R/W	Baud rate (6=9600, 7=19200, 8=38400, 9=115200)	6
0x100D	R/W	Parity (0=none, 1=odd, 2=even)	0
0x100E	R/W	Stop bit (1=1bit, 2=2bit)	1
0x100F	R/W	Combined code (1=Fwd, 2=Rev, 3=Fwd+Rev, 4=Fwd-Rev)	3
0x1010	R/W	Demand mode (0=Interval, 1=Slip)	0
0x1011	R/W	Demand cycle (1–30 min)	15
0x1016	R/W	LCD button password (0000–9999)	0000
0x1017	R/W	SO output rate (imp/kWh)	1000
0x1018	R/W	Meter running time (write 0 to reset, FC10h)	—
0x101A	R/W	Timing current (mA, FC10h)	20

Note on 0x1007 (time write): Writing returns Modbus exception 3 (Illegal Data Value). This register may be read-only in FW 3.01 or require a specific unlock sequence not documented.

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Write-Only Command Registers

Address	Value	Effect
0x2001	0x3FFF	Reset ALL resettable energy counters (bits 0–13)
0x2001	0xA5xx	Reset selective resettable energy (bitmask in low byte)
0x2002	0xFFA5	Reset ALL max demand values
0x2002	0xA5xx	Reset selective max demand (bitmask in low byte)

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ESPHome Implementation

Device: energy-heatpump.yaml

47 sensors total:

Group	Count
Voltage (L1/L2/L3)	3
Current (L1/L2/L3)	3
Active Power (L1/L2/L3/Total)	4
Apparent Power (L1/L2/L3/Total)	4
Reactive Power (L1/L2/L3/Total)	4
Frequency	1
Power Factor (L1/L2/L3/Total)	4
Energy totals (forward/reverse/total active + reactive)	5
Energy per phase (L1/L2/L3)	3
Resettable energy (total/forward/L1/L2/L3)	5
Daily energy (Total/L1/L2/L3)	4
Max demand (forward/reverse/total + per phase)	9

2 buttons:

• Reset Resettable Energy → writes 0x3FFF to 0x2001
• Reset Max Demand → writes 0xFFA5 to 0x2002

Settings:

• update_interval: 10s
• flow_control_pin: GPIO21
• Force update on boot: id(orno_we529)->update()
• Logger level: INFO