To be used with PC connected to video projectors, where the lighting controller may require control of a presentation on the video screen but the PC for the presentation is located in a different location to lighting control. The Hardware required for this project is quite simple see Circuit. The DMX data is converted inthe 75176 Bus Transceiver connecting to the USART receiver in the PIC on Pin 7. Also
in the interrupt routine in the keyboard receiver which decodes keys typed on the keyboard and the keyboard send code which send key pressed from the unit.