4G + DLMS/COSEM Communication
4G uplink with standard DLMS/COSEM (IEC 62056) protocol and dual-SIM single-standby failover; RF downlink (Bluetooth/PLC optional) for display communication.
DDSY-T02 4G Single-Phase Two-Wire Wall-Mounted 4G Smart Prepayment Meter
DDSY-T02 4G is a single-phase two-wire wall-mounted 4G smart prepayment energy meter for residential prepaid, remote meter reading and anti-tamper applications. Direct-connected at 230 V, 5(100) A, with Class 1.0 (B) active and Class 2.0 (A) reactive accuracy. It supports STS, currency prepaid, kWh prepaid and post-paid modes, 4-tariff 8-period time-of-use, demand measurement, relay load control, comprehensive anti-tamper detection and DLMS/COSEM (IEC 62056) communication over 4G.
Wall / Suspension Mounted
1P2W Direct Connection
4G Communication
100 A Maximum current
230 V Rated voltage
Class 1.0 (B) Active energy accuracy
−20°C to +70°C Operating temperature
Product Highlights
Smart 4G Prepayment Metering & Load Control
Class 1.0 Accuracy
Class 1.0 (Class B) active-energy and Class 2.0 (Class A) reactive-energy measurement in accordance with IEC 62053-21.
STS + Multi-Mode Prepayment
Supports STS token, currency prepaid, kWh prepaid and post-paid modes, configurable via communication for flexible residential billing.
4-Tariff 8-Period Time-of-Use
4 tariffs and 8 time periods with holiday, step, weekly, timezone and backup tariffs for complex time-of-use billing.
Anti-Tamper Detection
Bypass, cover, side-cover, magnetic disturbance, current unbalance, neutral-loss and reverse-current detection with event logging and self-diagnosis.
Relay Load Control + Demand
Single relay load control for overload, over/under-voltage, reverse-current and remote disconnect/connect, plus sliding/interval demand measurement (default 15 min).
Technical Specifications
Technical Specifications
| Voltage connection | Direct connection |
| Rated voltage | 230 V (0.8–1.15 Un working range) |
| Frequency | 50 Hz |
| Current connection | Direct connection (shunt sampling) |
| Basic / max current | 5(100) A |
| Pulse constant | 1000 imp/kWh (active) / 1000 imp/kvarh (reactive) |
| Power consumption | ≤10 VA / 2 W |
| Active energy | Class 1.0 (Class B) |
| Reactive energy | Class 2.0 (Class A) |
| Uplink | 4G |
| Uplink protocol | DLMS/COSEM (IEC 62056), IDIS-based framework |
| SIM | Plug-in 4G SIM + eSIM reserved, dual-SIM single-standby |
| Dual-SIM failover | Auto-switch to backup after ~15 min, periodic 15-day rotation |
| Downlink | RF (default), Bluetooth/PLC optional |
| RS485 | RJ45 interface |
| IR | HDLC optical port, DLMS |
| Compatible objects | MC171 and VTC |
| Prepayment modes | STS, currency prepaid, kWh prepaid, post-paid |
| Tariff | 4 tariffs, 8 time periods + holiday/step/weekly/timezone/backup tariffs |
| Demand | Sliding and interval demand, default 15 min period |
| Load control | Single relay: overload, over/under-voltage, reverse-current, remote disconnect/connect |
| Load profile | ≥100 days (30 min default); 12-month monthly billing |
| Anti-tamper | Bypass, cover, side-cover, magnetic, current-unbalance, neutral-loss, reverse-current |
| Event logging | ≥100 events + self-diagnosis (metering/clock/RAM/battery/storage failure) |
| LCD display | 6+2, backlight (green/red), keypad + numeric keypad |
| IP rating / protection | IP54 / Class II |
| Mounting | Wall / suspension; LNNL single-phase two-wire |
| Operating temperature | −20°C to +70°C |
| Relative humidity | ≤95% (non-condensing) |
| Altitude | ≤2000 m |
Structure & Dimensions
DDSY-T02 4G Dimensions & Wiring
Dimensions
Wiring
FAQ
Product FAQ
What is DDSY-T02 4G?
DDSY-T02 4G is a single-phase two-wire wall-mounted 4G smart prepayment meter for residential prepaid, remote meter reading and anti-tamper applications.
What communication does it support?
4G uplink with DLMS/COSEM (IEC 62056); RF downlink (default), with Bluetooth/PLC optional; RS485 (RJ45) and IR (HDLC/DLMS) local ports.
What prepayment modes are supported?
STS token, currency prepaid, kWh prepaid and post-paid modes, configurable via communication.
What tariff structure does it provide?
4 tariffs and 8 time periods, plus holiday, step, weekly, timezone and backup tariffs.
What anti-tamper detection is included?
Bypass, cover, side-cover, magnetic disturbance, current unbalance, neutral-loss and reverse-current detection.
What load control does it provide?
A single relay for overload, over/under-voltage, reverse-current and remote disconnect/connect.
What is the certification/standard basis?
IEC 62053-21:2020, IEC 62052-11:2020, IEC 62055-41:2018. Designed based on STS, SABS and IDIS framework (not declared as fully compliant).
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