User Manual
iM871A Wireless M-Bus General Feature Overview
iM871A_WMBus_UserManual.docx, Wireless Solutions, v1.2 Page 7
iM871A Features
Host Controller Interface
With a message based serial protocol the user is able to connect the iM871A radio module
to a host system. It can be used for configuration, data exchange and device control. Each
message to or from the radio module is embedded in a specific message frame. For
Windows PC applications a library (DLL) can be used. To connect the radio module to
embedded systems example code is available.
Power Management
The iM871A radio module provides two different power saving modes to operate best in
battery driven applications:
Low Power Mode (with RTC running)
Low Power Mode (with RTC off)
These modes can be called via the Host Controller Interface (HCI). The wakeup can also be
done over the serial interface.
Moreover the iM871A provides the opportunity to enter one of the power save modes
automatically after a successful WM-Bus packet transmission.
Supported Device Modes
The iM871A is designed for metering applications (Meter-Mode), but it also can operate in
Other-Mode (Concentrator, Data Collector, etc.).
Operation- and State-Indication
When using the iM871A together with WiMOD Demoboard there is the option to indicate the
internal states of the module by LEDs.
TX Indicator LED: a WM-Bus packet is transmitted successfully
RX Indicator LED: a WM-Bus packet was received successfully
Alive Indicator LED: The module is awake and ready for operation
The LED indication can be disabled by configuration.
Real Time Clock
The iM871A provides an embedded RTC which can be used for timer controlled operations
e.g. automatic transmission of WM-Bus messages at specific times or with a configurable
interval (on inquiry).
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