Note: Do not install an on/off switch on the main (red) battery line, or connect the white ignition sense wire to the red battery wire. Both configurations bypass the MP modem's controlled shutdown sequence, and may cause data loss and subsequent power-on problems. Incorrect wiring may also drain the vehicle battery.

Hardware and Software Installation

The MP modem’s power on/off is controlled by the ignition sense line (white wire) using internal software, rather than a hard on/off switch on the red power line. The red, black, and white wires connect to the battery and ignition switch as shown in the power harness wiring diagram.

Note: The battery cable used for a car, truck, or other mobile connection must be less than 3 meters in length.

Switch (vehicle

Red wire

5 A fuses (on red

ignition key, or

(Battery)

and white only)

separate)

 

MP modem

 

 

White wire

Black unfused wire

(Ignition sense)

(Ground)

Vehicle battery

Figure 3-7: Wiring for the power harness.The white wire is the ignition sense.

When the white ignition sense line is pulled high (5 to 36 V), the MP modem powers on.

When the ignition sense line is pulled low (less than 2 V), the MP modem performs a controlled shutdown sequence (under software control), de‐registering and saving any relevant operational data before powering off.

Ignition sense options

There are three ways to connect the ignition sense wiring:

Engine on only. Connect the white ignition sense wire to the vehicle’s ignition switch so that the MP modem is powered on only when the ignition key is switched to the full “On” position, that is, when the engine has been started. In this configuration, the engine must be running for the MP modem to be on.

—or—

Accessory on. Connect the white ignition sense wire to the vehicle’s ignition switch so that the MP modem is powered on when the ignition is switched to “Accessory” mode. In this configuration, the MP modem is on whenever other vehicle electrical devices can be switched on—such as when the radio and windshield fan can run.

 

 

 

 

 

 

 

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Sierra Wireless MP 875 manual Ignition sense options

MP 875 specifications

The Sierra Wireless MP 875 is a cutting-edge device designed to cater to the needs of modern IoT applications and mobile networking solutions. This rugged mobile router stands out for its robustness, versatility, and advanced features, making it an ideal choice for industries such as transportation, public safety, and remote work environments.

At the heart of the MP 875 is its support for both LTE and advanced LTE-A technologies, providing high-speed internet access with speeds reaching up to 300 Mbps. This enables seamless connectivity for multiple devices, supporting applications such as video streaming, real-time data transfer, and cloud-based solutions. The dual-SIM capability enhances network reliability and allows for automatic failover, ensuring continuous connectivity even in remote locations.

One of the key characteristics of the MP 875 is its rugged design, built to withstand tough environmental conditions. The IP67-rated casing ensures protection against dust and water, making it suitable for deployment in harsh outdoor settings. Its wide operating temperature range further enhances its versatility, allowing it to function effectively in extreme heat or cold.

Another notable feature is the onboard Wi-Fi, which supports both 2.4 GHz and 5 GHz bands, enabling the connection of multiple devices with minimal interference. This dual-band functionality provides users with the flexibility to optimize their wireless connections based on their specific requirements. Additionally, the MP 875 includes comprehensive security features, such as VPN support, firewall protection, and advanced encryption protocols to safeguard sensitive data.

Moreover, the device supports various IoT applications, including fleet management, asset tracking, and telemetry. With built-in GPS capabilities, users can easily track the location of their assets or vehicles in real-time, enhancing operational efficiency and safety.

The MP 875 also boasts a user-friendly management interface, allowing for straightforward configuration and monitoring of devices. Remote management capabilities facilitate streamlined updates and troubleshooting, reducing downtime and improving overall productivity.

In conclusion, the Sierra Wireless MP 875 is an advanced mobile router that excels in providing reliable, high-speed connectivity in a rugged form factor. Its blend of LTE technologies, robust design, and comprehensive security features makes it an exceptional choice for businesses looking to leverage the power of IoT and mobile networking. Whether for transporting goods, managing public safety operations, or enabling remote work solutions, the MP 875 is a reliable partner for modern connectivity needs.