> You are viewing the **AI / markdown** version of this page. > The normal page (with images and layout) is at: https://www.owon-iot.com/products/pc4711-w-485/ --- # PC4711-W-485 Single-Phase WiFi + RS485 Open API Zoom PC4711-W-485 # Single-Phase WiFi + RS485 Open API Smart Energy Meter 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 Single Phase API WiFi RS-485 TCP/IP Modbus ## Overview Coming soon. The PC4711 Open API models are not shipping yet — availability is confirmed with your sales contact. The specifications below describe the released design, so the page can be used for planning and comparison. 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, 20 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 | 20A~300A (CT dependent) | | Frequency | 50/60Hz | | Power Supply | ## 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. How fast can it report? The reporting interval is configurable from 1 second: report_interval in device.measure.config, range 0 to 3600 seconds, default 10/600. This is the model for integrations that cannot live with the usual 15-second cycle — a requirement for reporting within 5 seconds is met here. Should I choose this or a three-phase model? By the supply. This model meters a single-phase circuit; a three-phase service needs the PC4713-W-485, which is the three-phase equivalent with the same protocol set. Can the meters be pre-configured to our broker before shipping? For project orders, yes — a preset broker address and individual credentials per device can be configured before dispatch. Can it be re-flashed to the Tuya version later? No. Different hardware, not a firmware change. What accuracy class is it? Voltage ±1%; current ±1% at rated current and ±2% at low current, banded per clamp — on a 300 A clamp, ±1% from 6 A up, ±2% between 2 A and 6 A, and ±5% below 2 A. Does it need a vendor app? No. The 471 series Open API models have no vendor app; configuration is a browser page served by the device itself. Is the link encrypted, and does it support client certificates? Yes — TLS/SSL with mutual (mTLS) authentication: the meter presents its own client certificate and key, and mutual authentication activates when both are present. Certificates are uploaded in chunks through the link.mqtt.security.certificate interface and can also be pulled from your own server for rotation. Modbus TCP and Modbus RTU over RS485 are not encrypted — encryption covers MQTT and the meters own HTTPS service. ## PC4711 Series — choose the right variant | [PC4711-W](/products/pc4711-w/) | WiFi + open protocol (HTTP / MQTT / Modbus TCP) | | --- | --- | | [PC4711-W-TY](/products/pc4711-w-ty/) | WiFi + Tuya Cloud | | [PC4711-W-TY/R](/products/pc4711-w-ty-r/) | + dry-contact relay (remote on/off) | | [PC4711-W-E-TY](/products/pc4711-w-e-ty/) | + wired Ethernet 10/100 | | [PC4711-W-E-TY/R](/products/pc4711-w-e-ty-r/) | + Ethernet + dry-contact relay | | [PC4711-W-TY/3CT](/products/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 . ## Related Products ### PC321-W/3W Single/Three-Phase WiFi MQTT Smart Energy Clamp WiFi TCP/IP [Link: /products/pc321-w-3w/] View details → ### PC321-W Single/Three-Phase WiFi Smart Energy Clamp WiFi TCP/IP [Link: /products/pc321-w/] View details → ### PC341-W-MQTT Multi-Circuit WiFi Power Meter WiFi [Link: /products/pc341-w-mqtt/] View details → ### PC4713-W-485 Three-Phase WiFi + RS485 Smart Energy Meter WiFi RS-485 TCP/IP Modbus [Link: /products/pc4713-w-485/] View details → ## Interested in Single-Phase WiFi + RS485 Open API Smart Energy Meter? Download the datasheet or request pricing — our team will respond within 24 hours. Download Datasheet PC471 Series Selection Guide WhatsApp +86 186 50139895 Our engineers usually reply within one business day.