Abstract: A remote control system is provided that includes a master controller for storing a plurality of remote control codes for a plurality of remotely controlled equipment, receiving a remote control code request message, retrieving a requested remote control code and transmitting the requested remote control code, and a remote control unit for transmitting the remote control code request message, receiving the requested remote control code from the master controller, storing the requested remote control code, converting the remote control code into a plurality of remote control commands and transmitting at least one of the plurality of remote control commands to at least one of the plurality of remotely controlled equipment, wherein each remote control code contains the plurality of remote control commands for controlling at least one of the plurality of remotely controlled equipment.

Abstract: A circuit system for selectively switching between main and remote loudspeakers includes a pair of input terminals for applying an input audio signal to the loudspeakers. A first selector switch contact is provided in series with the main loudspeakers. A second selector switch contact is provided in series with the remote loudspeakers. A current-dependent resistance element is provided in series with the remote loudspeakers to protect the remote loudspeakers from overdrive. The circuit system may also include a second current-dependent resistance element and a cooperating defeat switch contact as well as a resistor and associated load limiting switch contact all in series with the remote loudspeakers.

Abstract: A switching network for interconnecting selected products of different electronic groups on display for purposes of active demonstration includes a plurality of nodes. Each product on display is operatively connected to one node. Each node further includes a microcontroller. A bus operatively connects the microcontrollers together as well as the products on display. The bus allows two-way communication between the microcontrollers that supervise all network functions. Additionally, each of the nodes includes a product selector switch and cooperating relay for selectively activating an adjacent product connected to the node and an indicator lamp that when illuminated indicates that the corresponding electronic product is connected for active demonstration.