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The iM871A-USB is a compact wireless M-Bus USB adapter based on the high performance wireless M-Bus module iM871A. The adapter offers a cost-effective RF solution for smart metering applications connecting water, heat, electricity and gas meters with standard equipment like Laptops, Tablets, etc. The iM871A-usb is qualified according to the RED 1999/5/EC and is fully compliant to the EN 13757-4 standard (S1, S1-m, S2, T1, T2,R2, C1 and C2). An adjusted output power of +14 dBm combined with the high sensitivity of the USB-Stick enables ranges up to 500m.

USB to UART Bridge Virtual COM Port (VCP) drivers for Microsoft Windows, WindowsCE and Linux are available ( Furthermore the Wireless M-Bus DLL and the Wireless M-Bus Studio GUI from IMSTs Wireless M-Bus Starter Kit “SK-iM871A” can be used to easily configure and explore the iM871A-usb.

Key features

  • Supports S1, S1-m, S2, T1, T2,R2, C1, C2 and combined C/T mode
  • Small size: 46 x 20 x 11 mm
  • Compliant to wireless M-Bus specification EN 13757-4
  • Max. output power up to +10 dBm
  • 128-bit AES support
  • RoHS conform
Frequency range863 Mhz to 870 MHz
Output powertyp. +10 dBm (EIRP)
Receiver sensitivityup to -110 dBm
Data rate4.8 kbps32.768 kbps100 kbps
Operating voltage4.4 V to 5.25 V
Supply currenttyp. 37 mA (RX)typ. 60 mA (TX @ +10dBm)
Antennaintegrated chip antenna
Dimension (LxWxH)approx. 46 x 20 x 11mm³
Operating temperature-20°C to +70°C
InterfacesUSB 2.0 compliant USB to UART Bridge Virtual COM Port (VCP) drivers for Microsoft Windows,WindowsCE and Linux available (