Suntech - ST25T

The ST25T is a compact vehicle telematics interface module engineered to extend Plaspy-compatible fleet tracking and telemetry solutions. Designed to forward vehicle bus and sensor data to gateway devices such as the ST4305/ST8300, the ST25T enables reliable integration of legacy serial equipment, fuel sensors and standard vehicle networks (J1939/J1708) into a Plaspy real-time tracking and fleet management workflow. Its small form factor, wide operating temperature range and low power draw make it suitable for heavy trucks, buses and other commercial vehicles operating in challenging conditions.

As a Plaspy compatible interface, the ST25T focuses on robust telemetry and sensor forwarding rather than acting as a standalone GPS tracker. When paired with a Plaspy-enabled gateway, the ST25T delivers the vehicle and sensor signals required for real-time tracking, fuel monitoring and anti-theft alerting across fleet management dashboards. Optional Bluetooth 4.1 support simplifies local configuration and accessory connectivity while multiple serial and ADC inputs provide flexible integration points for vehicle systems and third‑party sensors.

Key Highlights

• Plaspy compatible telemetry interface — forwards vehicle bus and sensor data to gateway devices (ST4305/ST8300) for real-time tracking and fleet management.
• Multiple serial interfaces — 2 RS232 ports plus a dedicated RS485 port (LLS protocol support) for fuel level sensors and legacy equipment.
• Flexible I/O — two ADC inputs (or two digital inputs) configurable for ignition detection, door or alarm inputs and other telemetry signals.
• Optional Bluetooth 4.1 — local configuration and BLE sensor/connectivity options for temperature beacons or accessory pairing.
• Low power operation — powered from host gateway at DC 5V with active and sleep consumption optimized for vehicle installations.
• Rugged design — engineered to operate from -30°C to +85°C and carries FCC certification for reliable field use.
• Designed for heavy-duty vehicles — direct support for J1939 and J1708 simplifies integration with truck and bus ECUs.

How It Works with Plaspy

The ST25T is intended to operate as a data interface that connects vehicle networks and sensors to a Plaspy-compatible gateway. It does not replace the gateway’s GPS receiver; instead, it enriches the gateway’s telemetry stream by supplying vehicle bus data, fuel readings and auxiliary sensor inputs. Plaspy ingests that combined data to provide unified, real-time tracking, alerts and reports across fleets.

• Real-time telemetry forwarding — vehicle ECU messages (J1939/J1708) and serial data are relayed to the gateway for live monitoring and historical reports.
• Fuel monitoring — RS485 port supports LLS-compatible fuel level sensors; readings can be processed by Plaspy for consumption and anomaly detection.
• Ignition and event inputs — ADC or digital inputs can detect ignition status, door/alarm events and other key signals for trip/idle reporting and anti-theft alerts.
• Bluetooth sensors — optional Bluetooth 4.1 allows local BLE sensors or configuration tools to pair with the ST25T during installation or maintenance.
• Legacy equipment integration — multiple RS232 ports accommodate older telematics devices, ticket printers or subsystem interfaces, preserving investment in on-board systems.

Technical Overview

Use Cases

• Fleet telemetry enhancement — forward CAN/J1939 engine and vehicle data to Plaspy for fuel, RPM, fault codes and operational reporting.
• Fuel level monitoring — connect LLS-compatible fuel sensors via RS485 to detect fuel theft, consumption trends and discrepancies.
• Legacy device integration — attach older serial devices, ticket printers or onboard accessories using multiple RS232 channels without gateway redesign.
• Ignition and event detection — use ADC/digital inputs to capture ignition status, door open/close events and alarm triggers for anti-theft workflows.
• Local configuration and BLE sensors — service technicians can configure the unit or pair BLE sensors during installation using the optional Bluetooth module.

Why Choose This Tracker with Plaspy

Selecting the ST25T as part of a Plaspy-compatible solution delivers practical value where vehicle bus integration, fuel monitoring and legacy serial connectivity are required. Rather than acting as a standalone GPS tracker, the ST25T focuses on telemetry aggregation and reliable forwarding to a Plaspy gateway, enabling comprehensive fleet management and real-time tracking when combined with a gateway that provides GNSS and cellular connectivity. Its low power consumption, robust operating range and FCC certification make it suitable for demanding commercial vehicle deployments.

For fleets that need telemetry-first integration — fuel monitoring, diagnostic forwarding and support for multiple serial devices — the ST25T simplifies installation and accelerates time-to-value when integrated into Plaspy-managed platforms. Refer to the official ST25T datasheet for full connector pinouts, mechanical dimensions and GNSS/wireless specifications, and contact the vendor for samples or customization to meet specific fleet or anti-theft system requirements.