Teltonika TRM250 Industrial Rugged USB Cellular LTE Cat-M1/NB-IoT Modem

The Teltonika TRM250 is a compact industrial cellular modem designed to add reliable LTE Cat M1, NB-IoT and 2G connectivity to existing industrial equipment through USB.

Unlike the TRM240, which is designed around LTE Cat 1 for higher data throughput, the TRM250 focuses on LPWAN cellular connectivity, making it particularly suitable for remote monitoring, telemetry, utilities, industrial IoT and other applications where low data rates, broad cellular technology support and long-term deployments are important.

Teltonika describes the TRM250 as an industrial-grade modem with multiple LPWAN options, including LTE Cat M1 and NB-IoT, with 2G backward compatibility. It combines these technologies with a USB interface, external cellular antenna and durable aluminium enclosure.

Key Features

• 4G LTE Cat M1 (LTE-M) connectivity
• NB-IoT (Cat NB1) connectivity
• 2G EGPRS fallback
• LTE Cat M1 speeds up to 375 kbps download / 375 kbps upload
• NB-IoT speeds up to 32 kbps download / 70 kbps upload
• USB interface for cellular internet connectivity
• Powered directly from 5 V microUSB
• Maximum power consumption of 3.6 W
• 1 × Mini SIM (2FF) slot
• 1 × SMA cellular antenna connector
• External antenna support for flexible deployment
• Rugged aluminium housing
• Compact industrial form factor
• DIN rail, wall and flat-surface mounting options*
• Wide -40°C to +75°C operating temperature
• IP30 protection
• Windows, Linux and Android driver support
• AT command control
• Power and network status LEDs
• Global cellular frequency version
• Ideal for remote monitoring and industrial IoT

*Mounting options require an additional mounting kit.

LTE Cat M1 & NB-IoT Connectivity

The key advantage of the TRM250 is its support for two major cellular LPWAN technologies:

LTE Cat M1 (LTE-M) and NB-IoT.

These cellular technologies are designed for IoT and machine-to-machine applications that typically require lower data rates than conventional broadband LTE connections.

The TRM250 supports:

The current TRM250 specification identifies the modem as a 3GPP Release 12 device.

Designed for Industrial IoT & Remote Monitoring

The TRM250 is particularly well suited to applications where equipment needs cellular connectivity but does not require the higher bandwidth, Ethernet, Wi-Fi or routing capabilities of a complete industrial router.

Typical applications include:

• Remote telemetry
• Industrial IoT
• Energy monitoring
• Water monitoring
• Environmental monitoring
• Utility infrastructure
• Remote equipment monitoring
• Data acquisition
• Embedded systems
• Smart city infrastructure
• Industrial computers
• Kiosks and terminals
• M2M communications

For applications transmitting relatively small amounts of telemetry or status data, LTE-M and NB-IoT can provide a more IoT-focused cellular solution than conventional broadband LTE.

Upgrade Existing Equipment with Cellular Connectivity

The TRM250 provides a straightforward way to add cellular connectivity to compatible existing equipment.

Instead of replacing an industrial computer, controller or embedded system with a cellular-enabled model, the TRM250 connects to the host through USB and provides the cellular communications interface.

This makes it suitable for upgrading compatible:

• Industrial computers
• Controllers
• IoT gateways
• Monitoring systems
• Embedded devices
• Data loggers
• Telemetry systems
• Remote terminals
• Industrial automation equipment

USB Connectivity & Power

The TRM250 uses microUSB for its host interface and power supply.

Power requirements are:

• 5 VDC via microUSB
• Maximum power consumption: 3.6 W

This compact USB-based architecture simplifies integration where a suitable USB host and power source are already available.

External Cellular Antenna

The TRM250 provides:

1 × SMA connector for the mobile antenna

The external antenna arrangement gives installers flexibility in antenna selection and positioning.

This is particularly useful where the modem is installed inside a control cabinet, equipment enclosure or other location where positioning the cellular antenna away from the host equipment can improve signal reception.

Rugged Industrial Construction

The TRM250 is housed in a durable aluminium enclosure, making it better suited to fixed industrial installations than conventional consumer USB cellular dongles.

The device measures approximately:

74.5 × 25 × 64.5 mm

and weighs only:

130 g

Its compact dimensions make it suitable for installation inside equipment cabinets and other space-constrained industrial environments.

Wide Operating Temperature

The TRM250 is designed for operation between:

-40°C and +75°C

with:

10% to 90% non-condensing humidity

and an enclosure ingress protection rating of:

IP30

This broad operating temperature range makes the modem suitable for many demanding indoor industrial and protected equipment installations.

Flexible Mounting Options

The TRM250 supports:

• DIN rail mounting
• Wall mounting
• Flat-surface mounting

The applicable additional mounting kit is required.

DIN rail mounting is particularly useful for integration into industrial control cabinets, switchboards and automation panels.

SIM Card Support

The TRM250 provides:

1 × Mini SIM (2FF) slot

supporting 1.8 V and 3 V SIM cards.

The SIM is installed internally behind the removable front panel.

Software & Driver Support

The TRM250 provides software and driver support for integration with common host operating systems, including:

• Windows Connection Manager
• Windows USB drivers
• Windows CE support
• Linux USB drivers
• Android support
• Android RIL driver
• Windows NDIS driver
• Linux Gobinet driver
• Linux driver support

This makes the modem suitable for integration with a range of industrial computers and embedded platforms.

AT Command Control

For developers and system integrators, the TRM250 can be controlled using 3GPP TS27.007 and enhanced AT commands.

This allows compatible host applications to interact directly with the cellular modem for customised industrial and OEM integrations.

Global Cellular Frequency Support

The current TRM250 is listed by Teltonika as a Global hardware version.

Supported frequencies include:

LTE-FDD: B1, B2, B3, B4, B5, B8, B12, B13, B18, B19, B20, B26 and B28

LTE-TDD: B39 for Cat M1

2G: B2, B3, B5 and B8

The standard package order code is:

TRM250000000

This global frequency configuration includes LTE Band 28, an important cellular band used extensively in Australian mobile networks. Actual LTE-M and NB-IoT service availability depends on the selected mobile carrier, SIM service and deployment location.

Technical Specifications