User Manual
iM871A Wireless M-Bus
General
iM871A_WMBus_UserManual.docx, Wireless Solutions, v1.2
Page 4
1.
General
The iM871A is an ultra-low-power, high-performance, pre-certified Wireless M-Bus module
fully compliant with EN 13757 part 4, Wireless M-Bus standard.
The module offers a cost-effective wireless solution for smart metering applications
connecting water, heat, electricity and gas meters with data concentrators. It operates in the
868 MHz frequency band and it supports all unidirectional and bidirectional Wireless M-Bus
modes (S1, S1-m, S2, T1, T2, R2, C1 and C2).
With a standby current of less than 1 µA, the iM871A is well suited for battery powered
devices like water and gas meters. The pre-certified module provides a serial interface as well
as analog and digital inputs and outputs and can easily be integrated into a meter. With its
integrated Wireless M-Bus protocol stack it will reduce the development time and cost. The
iM871A can achieve a link budget up to 123 dB, resulting in exceptional RF range and
communication performance.
Figure 1-1: iM871A
1.1
Key Features
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Compact module 16.8 x 18.6 x 2 mm for SMD mounting
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Ultra low power modes for extended battery lifetime
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Communication/Configuration via UART, SPI and I²C interface
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Digital inputs and outputs
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Analog inputs
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Supply voltage range from 1.8 to 3.6 V
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RF interface matched to 50
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Output power level up to +14 dBm
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High link budget up to 123 dB
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Range up to 3000 m (line of sight)
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64 kByte Flash + 4 kByte RAM Memory
