Technical Specification of Electric Meter Communication Board Drag
1. Overview
The electric meter communication board is one of the core components of smart electricity meters. It is mainly responsible for data acquisition, local communication and remote network interaction. Serving as the connection bridge between the metering module of the electricity meter and the external management system, it forms the hardware foundation for smart grid implementation, remote meter reading and prepaid management. This communication board supports two mainstream communication modes: **RS485 wired communication** and **wireless remote communication**, to meet deployment requirements of various application scenarios.
2. RS485 Communication (Local / Wired Communication)
RS485 is an industrial serial bus communication standard featuring strong anti-interference performance, long transmission distance (up to 1200 meters) and multi-point networking capability.
2.1 Interface Definition
- Physical Interface: 2-wire terminal (Line A, Line B) or shielded 3-wire terminal (Line A, Line B, GND)
- Electrical Isolation: Optocoupler isolation is implemented between the communication board and the main circuit of the electricity meter to prevent high voltage from intruding into the low-voltage circuit and protect equipment and personal safety.
2.2 Communication Protocol
- Compliant with standard industry protocols, mainly **DL/T 645 (Chinese multifunction electricity meter communication protocol)** and Modbus-RTU.
- Configurable baud rates (1200bps, 2400bps, 9600bps, etc.). Supports parameter reading, frozen energy data reading, remote switch-on and switch-off control.
- 2.3 Application Scenarios
- Centralized installation sites: residential communities, commercial complexes and industrial parks. Multiple electricity meters are cascaded via the RS485 bus and aggregated to a data concentrator for unified network upload.
- On-site meter reading: maintenance or property staff connect to the bus via handheld PDA for on-site data reading.
3. Remote Communication (Wireless / Network Communication)
The remote communication module eliminates the high cost of manual meter reading for dispersed installations and enables direct meter data upload to the cloud platform.
3.1 Supported Communication Technologies
- NB-IoT: Low-power wide-area network with wide coverage and strong penetration. Ideal for signal-weak environments such as underground parking lots and electrical wells. Supports battery-powered and ultra-low-power operation.
- 4G / Cat.1: High transmission speed and low latency, suitable for scenarios requiring high-frequency data interaction and real-time charge control.
- LoRa: Local area wireless communication that works with gateways for private networking within designated industrial parks.
3.2 Core Functions
- Scheduled automatic reporting: Automatically upload electricity consumption, voltage, current, power and other metrics to the cloud management platform at preset intervals.
- Active event alarm: Push alarm notifications to the platform upon abnormal events including power failure, meter cover opening, magnetic tampering and low balance.
- Remote charge control: Integrated with the prepaid system to realize automatic power cutoff for arrears and automatic reconnection after recharge without manual operation.
4. Hardware Interface & Debugging Guide
The communication board is equipped with an independent debug port for firmware flashing and troubleshooting.
- Debug Interface: Standard SWD interface (CLK, DIO, GND, 3V3/AVDD pins). Compatible with dedicated debuggers (e.g., ATK-WLDBG) for firmware upgrade.
- Status Indicators: Power indicator (PWR), network status indicator (NET), transmit / receive indicator (TX/RX) for fast communication fault diagnosis.
- Protection Design: Surge protection and ESD protection are integrated to guarantee stable operation under complex electromagnetic conditions.
5. Solution Comparison & Selection Guide
Summary: The RS485 + concentrator solution delivers the best cost-performance for newly built centralized residential districts. For renovation projects and single apartments where wiring is difficult, wireless remote communication can greatly reduce construction and operation costs.
Wuxi Zhongyi Smart Technology Co., Ltd. focuses on R&D and production of smart water meters, energy meters and gas meters. Our products are available in over 90 countries across the globe.
Feel free to contact Zhongyi Intelligent for inquiries about smart water meters, electricity meters and gas meters.
