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The iM880B-L is a compact and low-cost radio module that operates in the unlicensed ISM 868 MHz band and combines a powerful Cortex® M3 controller with the LoRa® transceiver of Semtech® Corporation. A sensitivity of up to -138 dBm and a maximum output power of +19 dBm results in a link budget of more than 156 dB. Even when reducing the output power to +14 dBm ranges beyond 15 km are possible in free space. It can be soldered like a SMD component.

iM880B supports the following frequency bands: EU868, IN865 and RU868 (on request)

This radio module is pre-certified according the European RED guideline and got Equipment Type Approval Certificate, which is mandatory to be imported and marketed in India. It also passed the Objenious, Orange™ and ThingPark interoperability test, which validates the performance of the iM880B in their LoRaWAN® network environment.

It’s available with the following protocol stacks:

LR Base

The embedded radio stack allows direct module to module communication without the need for further LoRa® infrastructure (gateway or network server).

Typical network topologies like peer-to-peer or star can be implemented based on a single type of low cost radio module.

Please refer to the download section.

ProLink LoRaWAN®

The LoRaWAN® protocol stack, specified by the LoRa Alliance®, enables Low Power Wide Area Networks (LPWANS) for Internet of Things applications.

In addition, the ProLink LoRaWAN® fw adds a proprietary device to device communication to the standard LoRaWAN® fw.

Please refer to the download section.

Our firmwares provides a HCI protocol designed to expose the radio module services to an external host controller. The communication between host and the radio is based on so called HCI messages which can be sent through the UART.

LoRaWAN® development software

To make the implementation of the application on the MCU of the IMST’s LoRa® modules easier, our devices support the following development tools:

  • LoRaWAN® Library (on request): designed to support the development of LoRaWAN® applications integrated into the IMST’s radio modules. It guarantees a successful LoRaWAN® communication as well as handling of GPIOs, software timer, USART interface, EEPROM access…
  • GitHub: reference implementation available as open source code developed by Semtech Corporation.
  • MBed OS: open source embedded operating system designed specifically for IoT. It includes all the features you need to develop a connected product based on Cortex-M, including security, connectivity, an RTOS and drivers for sensors and I/O devices.

LoRaWAN Library
  • Automated Meter Reading
  • Home and Building Automation
  • Wireless Alarm and Security Systems
  • Industrial Monitoring and Control
  • Long Range Irrigation Systems
  • IoT (Internet of Things)
  • Smart Cities
Frequency rangeSRD Band 863 to 870 MHz
ModulationLoRa® Spread-Spectrum
RF output powerup to +19 dBm (50Ω pad)
Receiver sensitivity-138 dBm (SF 12; SB 125 kHz, CR 4/6)
-134 dBm (SF 12; SB 250 kHz, CR 4/6)
-128 dBm (SF 12; SB 500 kHz, CR 4/6)
RF datarate0.24 to 37.5 kbps LoRa® modulation
250kbps FSK-modulation
RF rangeup to 15000 m (line of sight)
Operating voltage2.4 V to 3.6 V
Current consumption< 1.8 μA (module in sleep, RTC running)
11 mA (Rx)
118 mA (Tx @ 3.0 V/ +19 dBm)
InterfacesUART
SPI *
I²C *
RF (LoRa®)
IOsDigital IOs
Analog Inputs
Dimension (LxWxH)20 x 25 x 3.3 mm
Operating temperature-40°C to +85°C
CertificationPrequalified according to ETSI EN 300 220
LoRaWAN certified
iM880B passed the Objenious interoperability test

The WiMOD Studios are Windows applications which allow you to explore the capabilities of the pre-programmed firmware. The GUI offers a comfortable way to configure and control the features of the embedded radio stack.

Playlist: WiMOD LoRaWAN® EndNode Studio
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Playlist: WiMOD LR Base Studio
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