Abstract An information display system is provided having a transmitter and a plurality of uniquely identified display terminals, each terminal having an IR receiver. Uniquely identified sets of messages are transmitted in by the IR transceiver for reception by the display terminals. Between each set of transmissions, the receiver is periodically activated. Once the presence of a transmission is sensed by the receiver, a timer forces the receiver to remain activated while it compares the uniquely identified received messages to the display terminals unique identification. The receiver stores the message that matches the identification of the display terminal and the timer forces the receiver to remain deactivated at least until the entire set of transmissions has been completed.
An electronic price display system comprising: a plurality of spatially distributed price display terminals each having assigned to it a unique address; a wireless transmission network comprising means for transmitting a carrier on which are modulated groups of uniquely addressed data messages of predetermined duration and individual means coupled to each respective display terminals for receiving the carrier; means when the carrier is present for maintaining each of the individual receiving means active until receipt of the address and message unique to the corresponding display terminal; means for deactivating each of the receiving means for the remainder of the duration of the group of messages after receipt of the address and message and; means for varying the order in which the messages are transmitted from group to group.
Claim 2
Dependent Claim
128 words
An electronic price display system comprising: a plurality of spatially distributed price display terminals each having assigned to it a unique address; a wireless transmission network comprising means for transmitting a carrier on which are modulated groups of uniquely addressed data messages of predetermined duration and individual means coupled to each respective display terminals for receiving the carrier; means when the carrier is present for maintaining each of the individual receiving means active until receipt of the address and message unique to the corresponding display terminal; means for deactivating each of the receiving means for the remainder of the duration of the group of messages after receipt of the address and message and; means for varying the order in which the messages are transmitted from group to group.