Understanding Cellular Signals in the Device

Schneider Electric Data Logger devices use global SIM technology to ensure reliable cellular connectivity. These features provide seamless operation across multiple networks, even in challenging environments.

NOTE: The Wavelet 4R device includes only one SIM card slot (SIM 1).

SIM Slot Configuration and Network Support

  • SIM1 (Primary):

    • Supports a wide range of cellular providers, including Verizon, AT&T, T-Mobile (U.S.), and global partners like Vodafone.

  • SIM2 (Secondary):

    • Supports Verizon and other providers with compatible transmission standards.

  • Global Coverage:

    • Device supports connectivity in over 180 countries.

    • No additional network selection or contracts are required—service plan includes cellular data.

APN and Network Selection

  • Default Behaviour:

    • Device first attempts to connect via an APN associated with the SIM1 vendor.

    • If the connection fails or signal is poor, the device switches to SIM2 and selects a stronger network.

  • Automatic Optimization:

    • Devices dynamically choose the network with the strongest signal for each transmission session.

    • This improves battery life and overall connection reliability.

Cellular Sessions Tab

  • Information Provided:

    • Shows detailed network data for both SIM cards, sourced from the cellular provider.

    • Includes session history, signal strength, and error logs.

    • ⚠️ This information is not available for devices using customer-provided SIM cards.

Example Scenario

  • Device begins communication using SIM1 and connects using the default APN.

  • After several sessions, it switches to SIM2 and connects via a Telenor-supported network.

  • If all communication attempts fail, error messages appear in the mobile app.

Devices in Challenging Installations

  • Devices installed in manholes or below-surface environments use the same connectivity logic as surface devices.

  • If both HTTP and MQTT connections fail:

    • The device retries based on the setting: GSM > HOME_INTERVAL_RETRY_ARRAY > home_interval_retry_minutes

    • ⚠️ Modifying this setting may increase battery consumption.

Behaviour During Connectivity Loss

  • Data Collection:

    • Device continues collecting/storing data in non-volatile memory—even if power is lost.

  • Power Conservation:

    • Transmission frequency is reduced to conserve battery.

  • Reconnection:

    • Once a signal is re-established, the device resumes its normal transmission intervals.

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