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SinoTrack - AL-900C Protocol

This page describes the public protocol context for using the SinoTrack AL-900C tracker with the Plaspy platform. It focuses on how the device communicates in general terms, what information the tracker typically reports, and how Plaspy receives and interprets that data for mapping, alerts, and fleet monitoring.

The AL-900C is a rugged and feature rich GPS tracker with multi band GSM connectivity, Sirf IV GPS positioning, a range of inputs and outputs, and configurable reporting modes. Plaspy uses shared connection settings across supported devices and automatically detects the tracker protocol. Exact message behavior and supported commands can vary by firmware, hardware revision, and manufacturer implementation, so this page presents public safe context rather than firmware specific internals.

Protocol Overview​

The device communication protocol is the set of rules the AL-900C uses to send location updates, status reports, and alarm events to a remote server and to receive remote configuration or control commands. In practice the protocol lets the tracker identify itself to Plaspy, report GPS position and telemetry, and notify the platform about events such as overspeed, SOS, or power changes.

  • Carries position data and telemetry such as GPS coordinates, time, and device status for Plaspy to map and analyze
  • Delivers alarm and event signals including SOS, overspeed, and main power on off to trigger notifications
  • Allows remote parameter updates and control where supported by the device firmware and manufacturer settings
  • Enables identification of the tracker so Plaspy can associate incoming reports with the correct device record
  • Supports periodic reporting and on demand updates according to the tracker configuration

How Plaspy Detects the Protocol​

Plaspy is designed to accept reports from many tracker models through a unified endpoint and to identify the incoming device protocol automatically. In most deployments you do not need to manually select a protocol inside Plaspy if the device is configured to report to the Plaspy endpoint using the correct server and transport.

  • Plaspy server domain is d.plaspy.com and Plaspy server IP is 54.85.159.138
  • The port is 8888 and all devices in Plaspy use the same port
  • The device may be configured using UDP or TCP on port 8888 depending on tracker support and configuration
  • When the AL-900C reports to the Plaspy endpoint, Plaspy automatically detects the tracker protocol and associates messages with the correct device type
  • Users typically only need to configure the tracker to send data to d.plaspy.com or 54.85.159.138 on port 8888 for Plaspy to receive reports

Transport and Connection Context​

Connection context explains how the AL-900C reaches Plaspy, and what transport options are commonly used. The AL-900C supports GSM and GPRS based reporting and can be set to use either UDP or TCP transports depending on the device configuration and firmware capabilities.

  • Devices may point to the Plaspy server using d.plaspy.com or the numeric address 54.85.159.138
  • The device may be configured using UDP or TCP on port 8888 according to what the tracker firmware supports
  • All devices in Plaspy use the same port so server configuration on the platform side is consistent across models
  • Transport selection can affect delivery characteristics for real time updates and acknowledgements depending on network conditions
  • Confirm device reporting mode and transport in the device configuration options or via manufacturer documentation to ensure reliable connectivity

Protocol Compatibility Notes​

  • Firmware revisions can change supported messages and optional features so compatibility should be validated for your specific firmware version
  • Hardware revisions or regional variants of the AL-900C may implement features or pins differently than other units
  • Manufacturer parameter settings such as reporting intervals, alarm thresholds, and remote control options can affect what data the protocol sends
  • Transport choice between UDP and TCP may be available as a configuration option and should match the Plaspy endpoint settings
  • Plaspy automatically detects the tracker protocol, but the device must be properly configured to report to the Plaspy endpoint
  • For the most current device behavior consult official SinoTrack documentation and firmware release notes

Why Protocol Understanding Matters​

Understanding the communication protocol helps ensure a smooth setup, reliable reporting, and effective troubleshooting when integrating AL-900C devices with Plaspy. Knowing what the tracker can report and how it signals events reduces configuration time and helps maintain long term operational reliability.

  • Allows correct device configuration so reports reach Plaspy and are parsed as expected
  • Helps diagnose connectivity issues related to transport selection or server settings
  • Improves alarm and alert tuning by matching device reporting options to operational needs
  • Informs decisions about firmware updates or hardware variations that affect protocol behavior
  • Supports predictable remote configuration and control when those features are available

Why Use Plaspy with This Protocol​

Using the SinoTrack AL-900C with Plaspy gives organizations practical visibility into vehicle locations, status, and events. The AL-900C provides robust environmental tolerances and a range of inputs and outputs that can feed useful telemetry into Plaspy for fleet monitoring, security, and operational oversight.

Plaspy simplifies connectivity by offering a single endpoint and port for all supported devices, and by automatically detecting the tracker protocol when a device reports to d.plaspy.com or 54.85.159.138 on port 8888. This reduces setup complexity while allowing the AL-900C to deliver GPS positions, alarm signals, and status updates into the platform.

To learn more about Plaspy and platform capabilities visit https://www.plaspy.com. For the latest device specific protocol details, firmware behavior, and manufacturer guidance verify information on the official SinoTrack website https://www.sinotrackgps.com/ since protocol support and device implementation can change over time.

Tracker Communication

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