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For a rapid start, an EIB solution developer may gain access to the EIB system by using standard EIB Bus Access Units (BAU's) with various levels of integration (scalability). These proven and ready-to-use building blocks are available off-the-shelf from major EIB system component providers, through standard distribution channels. (Alternatively of course, one may go for developing one's own implementation on any suitable microprocessor chip.)
Bus Coupling Unit (BCU)
The Bus Coupling Unit is the most complete BAU, with Medium Access, EIB OS firmware, application hosting resources (CPU, RAM, EEPROM, …) and the full PEI and EMI. A BCU is housed in a compact, screened and ready-to-install package; construction shapes are aligned to the demands of practical installation, like DIN-rail of flush-mounting. Application-compatible BCU's are available for all EIB media.
Bus Interface Module (BIM)
EIB Bus Interface Modules (BIM) fulfil the same tasks of bus access and application host a BCU does - but with only the electrical PEI (with EMI), and no EMC shielding or housing. This makes them ideal for tighter integration into the application-specific solution. Currently, a high-end C programmable TP BIM is available with 8-32 k EEPROM.
chip set, UART, source code
BAU building blocks may also be obtained as a chip set, with EIB on board.
For the TP medium, UART components are available providing Link-Layer access.
EIB source code may licenced from EIB system providers as well, facilitating rapid 3rd party implementations.
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