Data transfer control between central unit and subscribers - uses divided dual port memory and interface identification memory for connecting of subscribers with different protocols

摘要

An arrangement for data transfer between a central unit or CU and subscribers connected via a serial bus exchanges data via a dual-port memory (11) connected to the CU via a parallel bus and to the subscribers via a serial bus. The memory address space (12,13) is divided into two regions each associated with a subscriber interface and a corresp. bus protocol. One region contains a special area for telegrams with a CU controlled pointer and an interface identification memory (14) set by the CU to release or block telegrams. A status memory (15) is set by the CU to control transmission. ADVANTAGE - Enables subscribers with different protocols to be connected.