The Queclink GL520MG is a waterproof, long-life GPS tracker designed for low-maintenance asset monitoring and environmental sensing. Green-Gps compatible out of the box, the GL520MG pairs multi-year battery life and rugged IP67 protection with LTE Cat M1 / NB2 connectivity and 2G fallback, delivering dependable real-time tracking and telemetry for static and mobile assets.
Engineered for large-scale deployments where maintenance windows are limited, the GL520MG provides accurate GNSS positioning, onboard temperature and light sensing for tamper detection, and a 3‑axis accelerometer for motion alerts. When integrated with Green-Gps, this tracker becomes a turnkey solution for fleet management, cold-chain logistics, warehouse asset visibility, and secure high-value asset monitoring.
Key Highlights
- Green-Gps compatible GPS tracker with LTE Cat M1 and NB2 connectivity plus EGPRS (2G) fallback for broad coverage.
- Extra-long battery life — multi-year standby operation (up to seven years under conservative reporting profiles).
- IP67-rated, waterproof enclosure with optional magnetic housing for flexible mounting on metal surfaces.
- Internal u‑blox GNSS module for high-accuracy positioning (autonomous < 2.5 m CEP) and fast TTFF.
- Built-in sensors: temperature and light for environmental and tamper sensing, plus a 3‑axis accelerometer for motion detection.
- Large message buffer (up to 10,000 messages), visual GNSS/status LEDs, and vibration confirmation for simple field operations.
- Queclink protocol support (@Track), TCP/UDP/SMS transport, geofence support and intelligent reporting to optimize power usage.
How It Works with Green-Gps
When connected to Green-Gps, the GL520MG streams position fixes, sensor telemetry and status events into the platform using standard TCP/UDP and SMS channels. Green-Gps ingests the GL520MG’s Queclink-formatted messages, normalizes telemetry and exposes location, temperature, motion and device health in dashboards, alerts and reports for operational teams.
- Real-time location and telemetry updates delivered to Green-Gps via TCP/UDP or SMS.
- Motion and tamper alerts from the 3‑axis accelerometer and light sensor trigger Green-Gps notifications and workflows.
- Temperature telemetry for cold-chain and environmental monitoring is forwarded to Green-Gps for threshold alerts and historic trending.
- Device health and power status (low battery alarms, activation reporting) appear in Green-Gps device inventory and maintenance queues.
- Geofence events (up to 20 regions supported on-device) create automated Green-Gps triggers for routing, anti-theft, and compliance workflows.
Technical Overview
| Connectivity | LTE Cat M1 (eMTC) and Cat NB2 (NB-IoT) with EGPRS (2G) fallback |
|---|---|
| Bands | Multiple LTE-FDD bands and NB2 regional band coverage; EGPRS 850/900/1800/1900 MHz |
| Power & Battery | Three CR123A lithium batteries (total 1,400 mAh); standby current < 8 µA; estimated standby: ~5 years with GNSS enabled (1 report/day), up to 7 years using cell-ID only (1 report/day) depending on network and conditions |
| Interfaces | Internal LTE and GNSS antennas; TCP/UDP/SMS data transport; Queclink protocol commands (@Track); scheduled reports; activation and low-battery reporting; geofence support (up to 20 regions) |
| GNSS | Internal u‑blox GNSS module; autonomous accuracy < 2.5 m CEP; sensitivity: autonomous −147 dBm, tracking −162 dBm; fast TTFF |
| Bluetooth | Not supported (no BLE reported) |
| Remote Management | Remote configuration and commands via Queclink protocol; scheduled time reports and intelligent report frequency adjustments to conserve battery |
| Form Factor | Compact asset tracker: 87 × 51 × 30 mm (87 × 51 × 33.5 mm with magnetic housing); weight 140 g (160 g with magnetic housing); IP67-rated |
| Memory | Internal buffer up to 10,000 messages |
| Operating Range | Operating temperature −20°C to +60°C |
| Certifications | FCC, Verizon, PTCRB, AT&T, T‑Mobile, CE |
Use Cases
- Cold‑chain logistics: temperature monitoring and position tracking for refrigerated shipments and pallets.
- Static high‑value asset protection: long standby life and tamper detection for outdoor equipment, containers and site assets.
- Pallet and container tracking: rugged enclosure and optional magnetic housing for easy attachment to metal assets.
- Warehouse and inventory visibility: scheduled reporting and motion detection to track stock movement without frequent battery changes.
- Fleet asset pools: track trailers, equipment and non-powered assets that require multi-year battery operation and reliable telemetry.
Why Choose This Tracker with Green-Gps
The GL520MG is a highly efficient GPS tracker that scales for large deployments where battery life, ruggedness and reliable cellular connectivity matter. As a Green-Gps compatible tracker, it integrates smoothly into Green-Gps’s real‑time tracking and telemetry workflows, supplying accurate GNSS fixes, temperature and motion data while minimizing maintenance overhead. This combination supports fleet management and asset visibility goals while enabling anti-theft alerts and operational reporting without frequent field servicing.
While the GL520MG focuses on long-life telemetry such as temperature, motion and tamper detection, Green-Gps can aggregate its data alongside other devices that provide additional capabilities — for example, ignition or immobilizer events, fuel monitoring, or Bluetooth sensors — giving operations teams a single pane of glass for comprehensive asset control. Choose the GL520MG with Green-Gps when you need precise positioning, robust enclosure ratings, proven cellular certifications, and power-optimized reporting for multi-year deployments.
Set Up GL520MG
To set the tracker send the following commands by SMS messages, the sample setup the device password is TZgjvmjq, this password is the default
- Restore factory settings
AT+GTRTO=TZgjvmjq,4,,,,,,FFFF$ - Set the time zone UTC-0
AT+GTTMA=TZgjvmjq,+,0,0,0,,,,,,FFFF$ - Set the operator APN
AT+GTBSI=TZgjvmjq,{{apn}},{{apnu}},{{apnp}},,,,,FFFF$ - Set the GPRS server
AT+GTSRI=TZgjvmjq,4,,1,d.plaspy.com,8888,54.85.159.138,8888,,0,0,0,,,,FFFF$ - Set the update interval 60 seconds.
AT+GTFRI=TZgjvmjq,1,1,0,0,,,60,60,60,60,7F,40,0,,,FFFF$ - Enable SOS button notification input 2
AT+GTSOS=TZgjvmjq,2,2,,0,0,0,0,0,0,,,FFFF$