PC4711-W-485

Single-Phase WiFi + RS485 Open API Smart Energy Meter

Name: PC4711-W-485 Single-Phase WiFi + RS485 Open API Smart Energy Meter
Brand: OWON Technology
SKU: PC4711-W-485

UniClip Open with a wired bus: single-phase meter on WiFi for HTTP, MQTT and Modbus TCP, plus RS485 Modbus RTU at a maximum 50 ms response.

Smart Meters MQTT WiFi rs485 MQTT Open Local API

Overview

PC4711-W-485 is the single-phase Open API meter with a wire as well as a radio: RS485 carrying Modbus RTU for systems that poll a serial bus, and Wi-Fi carrying HTTP, MQTT and Modbus TCP for everything else. Both live on the same device.

The practical case is a site with a cable already at the board, or one where a control loop cannot depend on a wireless link: Modbus RTU answers in a maximum of 50 ms, on top of the 50 ms data refresh. No app and no cloud account - the meter is configured from a browser page served over its own hotspot.

PC4711-W-485 Platform and Integration Notes

Minute-level offline storage. Data is buffered locally and re-reported after a reconnect, so a dropout does not become a hole in the dataset.

Full remote management, over the wire or over the air. OTA firmware, CT configuration, data erase and remote reboot.

Up to two open-type CTs, 80 A to 300 A, clipped on without rewiring, with bidirectional metering on the single-phase circuit.

Home Assistant integration on the platform side, alongside the wired Modbus loop.

PC4711-W-485 Limits and What to Specify Instead

Three-phase supplies — the Open API equivalents are the PC4713-W and PC4713-W-485; a 3P3W or delta service needs the Tuya-series PC4713-W-E-TY/3W.
Relay output — no model in the Open API range carries a dry contact; load switching is a Tuya-series option.
The Tuya App and Tuya Cloud history — this is the self-hosted build.
A third metering channel — not offered in the Open API single-phase range.

Specifications

Accuracy	±1% (Voltmeters)
Ammeter Accuracy	80A CT: ±1% (1-80A), ±2% (0-1A); 120A CT: ±1% (2-120A), ±2% (0-2A); 200A CT: ±1% (2-200A), ±2% (0-2A); 300A CT: ±1% (6-300A), ±2% (2-6A), ±5% (0-2A)
Voltage	90~277 Vac 50/60Hz
Current	80A~300A (CT dependent)
Frequency	50/60Hz
Power Supply	<2W
Protocol	WiFi 802.11 b/g/n @ 2.4GHz (HTTP / MQTT / Modbus TCP) + RS485 (Modbus RTU)
Wi-Fi	802.11 b/g/n @ 2.4GHz
RS485	Modbus RTU
Data Refresh	50ms
Response Time	Max 50 ms (Modbus RTU over RS485)
Supported Systems	Single-Phase
Mounting	35mm DIN rail mounting
Dimensions	19(W) x 69(D) x 90(H) mm
Operating Temp	-20℃ to +55℃ (≤90% non-condensing)
Measured Parameters	Voltage, Current, Power Factor, Frequency, Active Power, Reactive Power, Apparent Power; Energy Usage / Solar Production
Reporting Cycle	Set in integration
offlineStorage	Minute-level, auto re-report after reconnection
hosting	No app required - configure from a browser over the device hotspot
Certification	CE
Place of Origin	China
Brand	OWON

Key Benefits

Two Independent Integration Paths

RS485 Modbus RTU for the control side and Wi-Fi HTTP / MQTT / Modbus TCP for the platform, both on the same meter.

Modbus RTU in 50 ms Maximum

A wired loop for PLC, BMS and SCADA that cannot wait for a wireless round trip.

Your Data Stays Yours

No third-party cloud in the path and no app to install; the meter is configured from a browser page.

Four-Quadrant With Demand

RMS / PQS measurement with current and maximum demand, plus minute-level offline storage and automatic re-report.

Ideal For

Common deployment scenarios where Single-Phase WiFi + RS485 Open API Smart Energy Meter delivers the most value.

PLC, BMS and SCADA Loops

RS485 Modbus RTU answers in a maximum of 50 ms while Wi-Fi carries the platform feed.

Sites with a Cable Already Present

Where the bus exists, the meter uses it rather than depending on wireless.

Local Control with Remote Reporting

A wired loop for control and Wi-Fi for reporting, both on one meter.

Solar, Storage and EV Charging

Four-quadrant measurement with demand, reported to a platform the operator controls.

Industrial Single-Phase Submetering

Per-machine or per-circuit metering on a wired bus.

Distributor and OEM Programmes

Neutral standard units, with branding and packaging available.

Frequently Asked Questions

What does the RS485 port add over the PC4711-W?

A wired path into systems that expect a serial bus. Modbus RTU over RS485 answers in a maximum of 50 ms, which is what PLC, BMS and SCADA loops are built around. The Wi-Fi path with HTTP, MQTT and Modbus TCP stays available on the same meter.

Do the wired and wireless paths conflict?

No. RS485 can serve the local control or BMS side while Wi-Fi carries HTTP, MQTT or Modbus TCP to a platform — two independent routes from one meter.

Is a gateway or cloud account required?

Neither. The meter reports to your own server, and configuration is done from a browser page served over the device hotspot.

What CT options are available?

Two open-type CT clamps, 80 A to 300 A, with inner diameters of 10, 16, 20 or 24 mm.

Should I choose this or a three-phase model?

This model meters a single-phase circuit. A three-phase service needs a PC4713 model; the PC4713-W-485 is the three-phase equivalent with the same protocol set.

PC4711 Series — choose the right variant

PC4711-W	WiFi + open protocol (HTTP / MQTT / Modbus TCP)
PC4711-W-TY	WiFi + Tuya Cloud
PC4711-W-TY/R	+ dry-contact relay (remote on/off)
PC4711-W-E-TY	+ wired Ethernet 10/100
PC4711-W-E-TY/R	+ Ethernet + dry-contact relay
PC4711-W-TY/3CT	+ 3 CT channels (three single-phase circuits)
PC4711-W-485 — this page	+ RS485 Modbus RTU (BMS / SCADA)

Not sure which variant fits your project? See the PC471 selection guide.

Interested in Single-Phase WiFi + RS485 Open API Smart Energy Meter?

Download the datasheet or request pricing — our team will respond within 24 hours.

Request Datasheet PC471 Series Selection Guide WhatsApp +86 186 50139895

Our engineers usually reply within one business day.