Eastron SDM120-Modbus

unverified library/modbus/eastron-sdm120.hal.yaml

Id	eastron-sdm120
Manufacturer	Eastron
Model	SDM120-Modbus
Driver	modbus
Hazard	low
Limits	unconfirmed This file has read channels only, so nothing in the file changes the device.

Read channels

Channel	Type	Unit	Every
voltage	number	V	2 s
current	number	A	2 s
power	number	W	2 s
power_factor	number	dimensionless	10 s
frequency	number	Hz	10 s
energy	number	kWh	60 s

openhal: "0.1"
device: { name: Eastron SDM120 energy meter, model: SDM120-Modbus, manufacturer: Eastron }
id: eastron-sdm120
match:
  modbus_id: 1
connect:
  modbus: rtu
  port: /dev/ttyUSB0
  baud: 2400
  parity: N
  stopbits: 1
  unit: 1
  timeout: 1 s
read:
  voltage: { unit: V, every: 2 s, range: [180, 260], map: { register: 0, kind: input, format: float32 } }
  current: { unit: A, every: 2 s, range: [0, 45], map: { register: 6, kind: input, format: float32 } }
  power: { unit: W, every: 2 s, range: [-10000, 10000], map: { register: 12, kind: input, format: float32 } }
  power_factor: { unit: dimensionless, every: 10 s, range: [-1, 1], map: { register: 30, kind: input, format: float32 } }
  frequency: { unit: Hz, every: 10 s, range: [45, 65], map: { register: 70, kind: input, format: float32 } }
  energy: { unit: kWh, every: 60 s, map: { register: 342, kind: input, format: float32 } }
hazard: low
notes: >-
  Suggested limits. A person must confirm every limit before this device can be written.
  The meter ships at Modbus address 1, 2400 baud, 8 data bits, no parity and one stop bit. Registers are the
  zero-based input register offsets from Eastron's protocol document, as IEEE 754 floats. This file only
  reads. Set port to your USB to RS-485 adapter.
provenance: { source: library, by: OpenHAL starter library, at: 2026-10-25, verification: { status: unverified } }