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System for ensuring valid communications between a central control and a plurality of remote modules

  • US 4,992,775 A
  • Filed: 10/14/1988
  • Issued: 02/12/1991
  • Est. Priority Date: 10/14/1988
  • Status: Expired due to Fees
First Claim
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1. An annunciation system for a wireless communications apparatus having a plurality of channels which provides for communications between a central control and a plurality of remote modules and having a plurality of means for selecting individual channels for communication, said annunciation system comprising:

  • means included in the central control for receiving said communications;

    a plurality of means for visually annunciating whether a particular selected channel is communicating, each annunciating means being located in physical proximity to a corresponding means for selecting a channel so that the operator associates an annunciation with a selected channel;

    means for determining whether a channel is communicating information validly to said central control;

    said annunciating means further including,a first light emitting diode having an emission spectrum of essentially a first color;

    a second light emitting diode having an emission spectrum of essentially a second color;

    said first and second diodes being connected in parallel and oppositely poled to form a two terminal visual annunciation means, wherein said annunciating means will display said first color if current is applied to said terminals in a first direction and will display said second color if current is applied to said terminals in the opposite direction; and

    said annunciating means displaying a third color, which is a combination of said first color and second color, when current is applied to/said terminal in an alternating manner.

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