Huaqingjun 9-Channel RS485 Ethernet Current Voltage Transformer Detect Module RS485 Modbus RTU Modbus TCP Acquisition Module

Qingjun Huaqingjun 9-Channel RS485 Ethernet Current Voltage Transformer Detect Module is a robust, easy‑to‑use data acquisition solution designed for precise monitoring of electrical parameters in industrial, commercial, and utility settings. This compact module brings together nine independent channels capable of measuring both current and voltage, with built-in transformer inputs, reliable RS485 communication using Modbus RTU, and optional Modbus TCP over Ethernet. Engineered for accuracy, durability, and compatibility, it simplifies integrating multiple sensors into SCADA, PLC, and energy management systems

Key features and benefits

- Nine independent measurement channels: Monitor up to nine separate circuits or transformer outputs simultaneously. Each channel accepts standard current and voltage transformer inputs, making the module suitable for three-phase systems, multiple single-phase points, or a mix of loads

- Wide measurement range: The module supports a broad range of current and voltage inputs through transformer coupling, enabling use with commonly found CTs and VTs. This flexibility allows accurate readings across low to high power installations

- High accuracy and stability: Designed for reliable long‑term operation, the module delivers stable measurements with low drift. It provides repeatable results for billing, load analysis, fault detection, and preventive maintenance

- Dual protocol support: Native RS485 using Modbus RTU ensures compatibility with many legacy and industrial controllers. With Ethernet and Modbus TCP support, the module can also connect directly to modern networks and IIoT platforms, bridging older hardware with newer systems

- Solid communication options: RS485 provides long-distance, noise-resistant serial links ideal for industrial environments. Ethernet offers high-speed, flexible network integration and remote access for monitoring and configuration

- Compact, DIN-rail mountable housing: The slim, durable enclosure mounts easily in control cabinets, saving space and simplifying wiring layouts. Clear terminal labeling reduces installation time and error.

- Easy configuration and addressing: Intuitive setup via Modbus registers allows quick channel scaling, filtering, and calibration. Addressing and baud rate settings for RS485 are simple to change, and network parameters are configurable for Ethernet deployment

- Safety and protection: Built-in surge protection and isolation between measurement inputs and communication interfaces protect both the module and connected equipment. The module meets industrial safety and EMC requirements for reliable field use

- Wide operating environment: Designed for industrial ambient temperatures, humidity, and electrical noise levels, the module operates reliably in factory floors, substations, and outdoor enclosures when properly housed

- Versatile applications: Ideal for energy monitoring, substation metering, building management systems, load profiling, preventive maintenance, and alarm systems. The module supports both real‑time monitoring and historical data collection through host systems

Typical uses

- Energy monitoring: Aggregate current and voltage data from multiple circuits to enable accurate energy accounting, detect inefficiencies, and support demand management

- Submetering: Use the nine channels to monitor separate tenant loads, equipment groups, or distribution branches for fair billing and performance tracking

- Condition monitoring: Track current and voltage trends to spot motor faults, unbalanced loads, or abnormal consumption patterns before failures occur

- Integration with SCADA/PLC: Provide consistent Modbus RTU data to SCADA systems and PLCs over RS485, or offer Modbus TCP endpoints for modern SCADA systems and cloud gateways.

- Renewable energy systems: Monitor inverter outputs, distribution lines, and storage equipment to ensure balanced operations and protect assets

Installation and wiring

The Qingjun module is designed with installer convenience in mind. Terminals are clearly marked for CT and VT inputs, RS485 A/B lines, Ethernet port, and power supply. DIN-rail mounting and a slim profile enable straightforward placement in distribution panels. Grounding points and isolation features reduce interference and improve measurement integrity. Standard wiring practices for CT polarity and VT phase must be followed to ensure accurate readings. For RS485 networks, use twisted pair cabling and terminate the bus at endpoints to minimize reflection. For Ethernet connections, standard CAT5e or higher cables are recommended

Configuration and integration

Configuration is achieved through Modbus registers accessible via RS485 Modbus RTU or Modbus TCP over Ethernet. Register maps include channel scaling, unit selection, filter settings, and alarm thresholds. Host systems can poll measurements at configurable intervals to balance update speed and network load. For systems requiring automatic discovery or integration with modern management platforms, Modbus TCP simplifies adding the module to existing IP networks, enabling remote readout and maintenance

Reliability and maintenance

Qingjun emphasizes reliable, low-maintenance hardware. The module’s solid‑state design minimizes moving parts, and industrial-grade components resist vibration and temperature shifts. Diagnostics and status registers provide quick visibility into communication health and input integrity, allowing maintenance teams to troubleshoot without removing the module from service. Firmware updates are manageable over the network where supported, enabling feature improvements and protocol refinements

Technical considerations

- Measurement inputs accept standard CT/VT signals; ensure transformer ratios are configured correctly in the Modbus register settings for meaningful values

- RS485 connections should observe proper wiring polarity and network termination; maximum bus length and node count depend on cable type and network conditions

- When deploying multiple modules on Ethernet, use network management practices such as static IP assignment or DHCP reservations and consider VLANs or firewalls for secure access

- Environmental protection for outdoor or harsh conditions should include appropriate enclosures to guard against moisture, dust, and extreme temperatures

Why choose Qingjun Huaqingjun 9-Channel module

Qingjun combines practical design with industrial communication standards to deliver a multi‑channel acquisition unit that is both flexible and dependable. Its nine-channel capacity reduces the number of devices needed in many deployments, lowering cost and simplifying wiring. Support for both RS485 Modbus RTU and Modbus TCP provides seamless integration with a wide range of control systems and modern networks. The unit’s focus on measurement accuracy, surge protection, and easy installation makes it suitable for professionals seeking a straightforward, scalable solution for current and voltage monitoring

The Qingjun Huaqingjun 9-Channel RS485 Ethernet Current Voltage Transformer Detect Module is a powerful, compact, and flexible data acquisition device for electrical monitoring. Combining nine transformer-compatible inputs with RS485 Modbus RTU and Modbus TCP over Ethernet, it fits diverse applications from energy management to industrial monitoring. With solid protection features, easy DIN-rail mounting, and straightforward Modbus configuration, it helps engineers and integrators get dependable, accurate electrical data into their control and monitoring systems quickly

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