A programmable data link module is used on a time division multiplex data bus. The module is functional as an input device, an output device, or both as an input and output device. It can receive data from the data bus during the selected time slot for a selected number of frames to control output devices...http://www.google.de/patents/US6072783?utm_source=gb-gplus-sharePatent US6072783 - I/O module for a serial multiplex data system with a programmable communication module selector
