Multifunction board unit for public transport vehicle

A discussed multifunction board unit is being developed for an use in public transport vehicles. It features multichannel acoustic outputs, RS-485 bus interface, IBIS interface, short-range 2.4 GHz communication, data/voice communication at frequency band of 160 MHz, ability to receive commands from sightless people transmitters, FLASH memory disk for data storage, inductive modem for automatic contact-less switch control and several inputs/outputs for generic use. The paper deals with software conception of designed unit based on single high performance signal microprocessor.