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The Starter Kit is a plug & play solution to explore the features and capabilities of the Wireless M-Bus radio module iM871A. The kit contains two demo boards and two radio modules soldered on specific adapter boards. The modules are pre-programmed with a Wireless M-Bus firmware. The demo board is the basic platform of the Starter Kit and provides several functional units. These units include power supply, USB interface, and diverse input and output elements, such as push buttons, DIP switches, potentiometer, and LEDs. In addition all pads of the attached radio module can be accessed via pin connectors. Connection between the radio module and the demo board is established via a module-specific adapter board. The radio module is soldered on the adapter board which is attached to the demo board through pin connectors. The adapter board also has an SMA jack connected to the RF output of the radio module, which can be used to connect an external antenna (or RF measuring and test equipment).

By using the adapter boards all WiMOD radio modules can be attached to the same demo board. In that way an easy comparison between the modules is achieved to determine which one is the best for a target product. The adapter boards including the appropriate radio modules can be ordered separately to expand the Starter Kit.

Key Features


  • Small footprint 16.8 x 18.6 x 2 mm
  • Compliant to wireless M-Bus specification
    EN 13757-4
  • Configuration and communication via UART (SPI)
  • Optimized for low power applications
  • Max. output power up to +14 dBm
  • RF range up to 3000 m (line of sight)
  • Digital IOs / I²C-interface
  • Analog inputs
  • 128-bit AES support
  • Solderable like a SMD component
  • 50Ω pad for antenna
  • RoHS conform
  • Flexible wireless M-Bus header configuration
  • Supports S1, S1-m, S2, T1, T2, R2, C1, C2 and combined C/T mode
  • 2x demo board
  • 2x module specific adapter board
  • 2x radio module soldered on the adapter board
  • 2x external antenna
  • 2x USB cable
  • 4x battery
  • PC tool – Wireless M-Bus Studio
Frequency rangeSRD Band 863 to 870 MHz
RF output powerup to +14 dBm (50Ω pad)
Receiver sensitivityup to -109.5 dBm in R2 mode @ BER <1 %
RF data rate4.8 / 32.768 / 100 kbps according to EN 13757
Rangeup to 3000 m (line of sight)
Operating voltage2.3 V to 3.6 V
Current consumption19 mA (RX)
29mA (TX @ 9.2 dBm / 3V* / MCU idle)
2 mA (Radio off / MCU idle @ 20 MHz)
<1 µA (Sleep, 32kHz Quarz active)
<50 nA (Deep Sleep)
RF (EN 13757-4)
IO’sDigital IOs
Analog Inputs
Capture und Compare
Pulse Counter
Dimension (LxWxH)16.8 x 18.6 x 2 mm
Operating temperature-20°C to +70°C