This article deals with a Linux low-level hardware driver for the RS-232 Data Interface of the European Installation Bus (EIB). The RS-232 Data Interface is based on the widely used Bus Coupling Unit 1 (BCU1), which requires a complex hard- and software protocol (Physical External Interface Type 16) for communication. After a short part about Linux and module device driver programming, we explain the concepts for a communication between a PC and the well-known BCU1. The succeeding part shows the design and implementation of the Linux device driver and a Java-based middleware built on top of it.
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