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A BIM (Bus Interface Module) is a module designed to be built into a target device. It contains the entire circuit required for KNX bus communication over the twisted pair medium and provides a power supply (5 V 10 mA / 20 V 5 mA) to an external hardware circuit.
All you need is the development tool package available from our approved distributions partners. With the development tool package you are able to create a complete BIM M 13.. application program.
The BIM M 13.. bus interface modules are based on the Renesas 78K0/KE2 microcontroller family. All three microcontrollers have identical hardware, they only differ in RAM and flash memory space. The following devices are in use:
BIM M 13.. application programs are developed with the IAR Embedded Workbench in C language.
Sending and receiving bus telegrams is done thanks to the build in communication stack embedded the BIM M 13.. operating system. The communication at application program level is done via communication objects.
To send a telegram the application program (written by the customer) just calls the API function from the operating system that reads the data from the communication object set by the application program and sends a corresponding telegram to the bus.
If a telegram is received the operating system copies the transferred payload data to the corresponding communication object of the application program that cyclically checks with another API function, what objects are updated.
For normal operation mode no power supply is needed. Normally the BIM and external hardware is powered via the KNX bus.
The BIMs already contain at delivery state the operating system. Therefore it is possible to program an application program via the KNX bus. An alternative way of programming the BIMs is to use the Renesas Flash Programmer PG-FP5.
The used System 2.5 operating system supports up to 254 communication objects.
For that part, the KNX Manufacturer Tool shall be used. For further information please refer to the KNX association (http://www.knx.org).