Data communication system

Details Data communication system Data communication system

2007-11-27

2007-11-27

Chan, Jason (Department: 2613)

Optical communications

Remote control

Switching

Reexamination Certificate

active

10378793

ABSTRACT:
A data communication system comprising a terminal unit for generating light signals responsive to status of switches and a control unit for receiving the signals spatially propagated and controlling operation of a predetermined load, wherein switches11and12are interposed between plus and minus lines51and52as power lines for supplying electric power from the control unit to the terminal unit, and connected in series with respective resistors R1and R2having different values of resistance, and the minus line is grounded in the control unit30through resistor R0. Potential of the minus line changes in response to switches11and12,and electronic signals indicative of the status of the switches are transmitted to the control unit separately from the light signals. Thus, even if the spatial propagation of the light signals is interrupted, the control over the operation of the load is secured.

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patent: 5831548 (1998-11-01), Fitzgibbon
patent: 10-285114 (1998-10-01), None
patent: 11-053677 (1999-02-01), None
patent: 2000-183981 (2000-06-01), None

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