MN-L90S
This document outlines the application guidelines for the Power Line Communication (PLC) module (Three-Phase Meter STA), which extends PLC technology from low-voltage electricity metering to IoT communication fields. The product is primarily designed for smart meters, energy management systems, new energy charging piles, and photovoltaic inverter systems, including centralized cabinet inverters, string inverters, and hybrid inverters in three-phase PV systems. With its reliable data transmission and three-phase compatibility, it enables efficient communication across diverse smart energy applications.
B.Reference Standards
- China Southern Power Grid (CSG) Technical Specification for Three-Phase Smart Energy Meters
- CSG Interface Protocol for Local Communication Modules of Metering Automation Terminals
- DL/T 645-2007 Multifunctional Energy Meter Communication Protocol
- CSG Low-Voltage Power Line Broadband Carrier Communication Protocol (Parts 1-6) Q/CSG 1204111-2022
- CSG Technical Manual for Advanced Applications of Low-Voltage Power Line Broadband Carrier
- State Grid Corporation of China (SGCC) Technical Specification for Power User Electric Energy Data Acquisition System: Communication Unit Q/GDW 1374.3-2013
- SGCC Technical Specification for Power User Electric Energy Data Acquisition System: Communication Unit Series Q/GDW 374.3-2009
C.Terminology
- CCO: Central Coordinator – Master node in power line communication networks.
- STA: Segment Termination Adapter – Sub-node in power line communication networks.
- PCO: Proxy Coordinator – Relay node in power line communication networks.
- OFDM: Orthogonal Frequency Division Multiplexing – A multi-carrier modulation technique.
- BPSK: Binary Phase Shift Keying – A digital modulation scheme using two phases.
- QPSK: Quadrature Phase Shift Keying – A digital modulation scheme using four phases.
- QAM: Quadrature Amplitude Modulation – A modulation scheme combining amplitude and phase variations.
- FEC: Forward Error Correction – An error control technique for data transmission.
- CRC: Cyclical Redundancy Check – A method for detecting data transmission errors.
Product Advantage
- Fully compliant with State Grid interoperability standards, compatible with Southern Grid and Guangdong protocols.
- Three-phase three-wire power supply, wide voltage range support (320-1040V).
- Physical layer peak rate: 6Mbit/s; Application layer peak rate: 2Mbit/s
- OFDM technology with BPSK/QPSK/8QAM/16QAM modulation schemes.
- Integrated high-performance ARM CPU (up to 266MHz) for multi-service smart grid applications.
- Supports FEC and CRC functions with robust noise suppression and error correction.
- Operating frequency band: 0.7-12MHz (configurable band segmentation)
- Operating voltage: DC 12V±1V
- Power consumption: <0.5W (standby), <1W (active)
- Operating temperature: -25°C to +75°C
- Storage/operating humidity: ≤95% (non-condensing)
- Product Specifications
Temperature -25°C to +75°C Humidity (RH) ≤95% (non-condensing) Atmospheric Pressure 63.0KPa to 108.3KPa (Altitude below 5000m) Power Supply DC 12V±1V Power Consumption Standby <0.5W, Active <1W Voltage Range 320V - 1040V Carrier Method PLC Frequency Band 0.7MHz - 12MHz (configurable band segmentation) Modulation Method OFDM Port Type RS485 (auto-adaptive) Baud Rate 9600bps (supports 1200-115200bps) Data Bits 8 Stop Bits 1 Parity None Port Type TTL (HDR1X3) Baud Rate 115200bps Data Bits 8 Stop Bits 1 Parity Even Whitelist Enabled by default Transmit Power Adjustment Configurable via AT commands Logical Topology Recognition Displays real-time node information and network hierarchy, monitors communication quality, and assists in fault diagnosis Asset Management Supports centralized queries of MAC addresses, software/hardware versions, and asset IDs Remote Firmware Update Enables wireless software version upgrades Insulation Resistance Power circuit to ground: >20MΩ Dielectric Strength Power circuit to ground: 4KV/1min ESD Immunity Contact discharge: 6KV; Air discharge: 15KV Surge Immunity Test Power circuit: ±6KV Power LED (Red) Steady on when powered (abnormal if blinking/off) Status LED (Red) Blinks during data transmission Phase A LED (Blue) Illuminates when local unit transmits via Phase A Phase B LED (Blue) Illuminates when local unit transmits via Phase B Phase C LED (Blue) Illuminates when local unit transmits via Phase C PCBA Size (L*W*H) 125mm × 75mm × 25mm
Module Dimensions and Mounting Hole Diagram
Interface Definitions
1.High-Power Interface Specifications
- Schematic Diagram
Port P1 (VH3.96-3A2T)
- High-Voltage Interface Pin Definition
| Pin No. | Pin Name | Description | Voltage Range | Remarks |
| 1 | A | Phase A in 3-phase 3-wire power line carrier | 320V ~ 1040V |
/ |
| 2 | B | Phase B in 3-phase 3-wire power line carrier | ||
| 3 | C | Phase C in 3-phase 3-wire power line carrier |
Low-Power Interface Specifications
- Schematic Diagram
Port P2 (XH2.54-8P)
- Low-Voltage Interface Pin Definition
| Pin No. | Pin Name | Description | Default Level | Remarks |
| 1-2 | 485_A | RS485 Communication A | 3.3V (RS485) | Auto-adaptive |
| 3-4 | 485_B | RS485 Communication B | 3.3V (RS485) | |
| 5 | GND | Power Supply Ground | DGND | Communication power supply (DC 12-16V, min. 4W output) |
| 6 | 12V | 12V Power Supply | 12V | |
| 7 | RST | Module Hardware Reset | Low Level | 3.3V TTL Level |
| 8 | SET | Reserved/Spare | Low Level |
