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iM871A-USBThe 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.


  • Small size: 46X20X11mm
  • low weight of 8gr
  • compliant to wireless M-Bus specification EN 13757-4
  • max. output power up to +10 dBm
  • 128-bit AES support
  • RoHS conform
  • supports S1, S1-m, S2, T1, T2,R2, C1 and C2

  • Smart Metering (EN 13757)
  • Data concentrators and reader

Operating Voltage: 4.4 V to 5.25 V
Supply current: typ. 37 mA (RX)
typ. 60 mA (TX @ +10dBm)
Dimensions (LxWxH): approx. 46 x 20 x 11mm³
Operating temperature: -20°C to +70°C
Frequency range 863 Mhz to 870 MHz
Data rates: 4.8 kbps, 32.768 kbps, 100 kbps
Output power: typ. +10 dBm (EIRP)
Receiver sensitivity: up to -110 dBm
Antenna: integrated chip antenna
Interfaces: USB 2.0 compilant
USB to UART Bridge Virtual COM Port (VCP) drivers for Microsoft Windows, WindowsCE and Linux available (