• Cellular Telemetry System

Cellular Telemetry System

      • Cellular-based telemetry (GSM or CDMA)
      • Cloud logging
      • 20X improvement in power consumption vs. typical cellular telemetry

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      True cloud-based sensor configuration, logging, reporting and data analysis all-in-one

      eTracker is the gateway between the sensors and the cloud. Data communication and IT infrastructure are merged under one user interface experience. eTracker was designed from the ground up to embrace the current and future trends of cloud-based remote data acquisition and the "Internet of Things" (IoT) revolution. This paradigm shift centralizes all the historically isolated processes of remote configuration, programming, logging, and telemetry. Configuration, logging, data processing and analysis is now done in the cloud, eliminating time and cost in programming and maintaining expensive, complex data loggers and communication devices at each remote location.

      • Cellular-based telemetry (GSM or CDMA) and station controller.
      • Direct Internet compliant data stream using HTTP/HTTPS.
      • Sensor measurements stored on easily-accessible SD card.
      • Cloud logging: all sensor data is forwarded to the cloud for processing, logging, retrieval and resulting action.
      • Integrated sensor interface with ports: 4 analog, 4 pulse, SDI-12 (up to 62 SDI-12 sensors).
      • Approximately 20X typical improvement in power consumption vs. typical cellular telemetry.
      • Intelligent data management, data buffering, and network verification to ensure successful transmission of critical data.

      Unique Features

      Link sensors to the cloud

      Sensor data is linked directly to the cloud-based Amazon service or user’s server via the cellular network using HTTP or HTTPS (optional FTP available).

      Unified data interface experience

      Sensor configuration, data storage, custom algebraic equations, custom data formats and forwarding, control, analysis, alarm notifications (email, SMS), reporting and actions all done with one simple cloud-based user interface.

      Easy configuration

      Configure with any device connected to the Internet via the cloud-based Stevens-Connect. No custom programming or scripts required.

      Automated updates

      Updates to firmware and cloud-based application can be automatic.


      Three user access levels for configuration, data management interface and visualization. Data is saved on SD card and on the secured and redundant Amazon Cloud Services. Optional data encryption available.

      Connection verification

      eTracker verifies connection with cell network and server connection before data is sent. If no connection is available or if data reception is not confirmed, data is saved and sent the next scheduled transmission.

      True cloud data service experience

      Your data is sent directly and securely to the Amazon cloud- based service. No back-end database hosting or web server controlled by Stevens in which data flow takes a detour to the cloud.

      Data format flexibility

      Optionally forward data in various formats for third party so ware platforms, like Aquarius or WISKI, and in other formats such as binary, pseudo-binary, SHEF, and more.

      Power control

      Power cycle commands automatically initiated with the Stevens’ SOLO power management system.

      Direct data access options

      Third-party programs can access data using REST API or HTTP post.


      16-bit dsPIC microprocessor, and 16-bit TI MSP430

      Data Storage

      Removable 2 GB SD memory card (FAT 32)

      Non-volatile memory

      All setup parameters

      Logging interval

      1 second to 24 hours (sensor dependent)

      Reporting interval

      2 minutes to 24 hours

      Cellular antenna

      External SMA

      LED indicators

      Power, cell network, test message

      Cellular communications

      • Dual band CDMA 800, 1900 MHz
      • Penta-Band HSPA+
      • GSM Quad band 850, 900, 1800, 1900 MHz
      • UMTS/HSPA Penta Band 850, 900, 1700, 1900, 2100 MHz
      • EGPRS / WCDMA / HSDPA / HSUPA Protocol Stack


      Listen/trigger mode/idle

      <2 mA

      Data receive/store/prepare for transmission

      150 mA

      Data transmit

      250 mA


      Input voltage

      10 to 18 VDC (reverse polarity protection)

      TX output power

      24.3 dBm (270 mW)


      Battery and RSSI (signal strength), internal diagnostic log file


      Analog input

      4 analog channels, single-ended
      Input type: 2 wire, 0 –2.5 V or4 - 20 mA current loop (accessible DIP switch)
      Sensor power: 24 VDC switched (under firmware control)
      Analog to digital (0-2.5 VDC): 21-bit resolution

      Pulse input

      4 pulse channels
      Input type: Edge triggered
      Maximum rate: 4 pulses per second

      SDI12 Input

      Number of sensors: up to 62 sensors
      Sensor power: 12 VDC switched, during measurement


      Operating temperature

      -30°C to 65°C (SIM Card selection may limit this range for GSM version)

      Storage temperature

      -40°C to 85°C (SIM Card selection may limit this range for GSM version)

      Lightning protection

      AC transient voltage suppressor (TVS) on each sensor port input


      Dimensions (H x L x W)

      1 3/8” (3.5 cm) x 5 1/8” (13 cm) x 3 3/4” (9.7 cm)


      10.78 oz (305.6 g)


      Cellular antenna


      Sensor module interface

      30-pin connector


      Power cable with flying leads, dipole dual-band cellular 800/1900 MHz antenna.