Powered communication link
First Claim
1. A powered communication link between a central controller and a remote substation comprising a single conductor having a movable or intermittent contact interacting between the central controller and the remote substation and further comprising:
- (a) power supply means located at the central controller for supplying electrical power over said conductor to said remote substation;
(b) electrical power storage means at said remote substation for storing the electrical power supplied over said conductor;
(c) data collection means at said remote substation powered by said electrical storage means;
(d) computer means at said central controller for periodically stopping the application of electrical power to said conductor and for sending data to and receiving data from said remote substation, wherein said remote substation includes computer means for sending data to and receiving data from said central controller; and
(e) pull-up network means at both said remote substation and said central controller operative upon the removal of power from said conductor for raising the potential of said conductor except in the presence of data thereon to prevent false triggering of said computer means.
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Accused Products
Abstract
A powered communications link between a central controller and a remote substation along a conductor that includes a movable or intermittent contact interacting therebetween includes a power supply located at the central controller for supplying electrical power over the conductor to the remote substation and an electrical power storage device at the remote substation for storing the power supplied over the conductor. Data and power are multiplexed over the conductor by the central controller which periodically stops the application of power to the conductors to permit a transmitter at the remote substation to send data to the central controller. A switch at the remote substation connects the power storage device to the conductor when power is being sent and disconnects it at all other times.
114 Citations
17 Claims
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1. A powered communication link between a central controller and a remote substation comprising a single conductor having a movable or intermittent contact interacting between the central controller and the remote substation and further comprising:
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(a) power supply means located at the central controller for supplying electrical power over said conductor to said remote substation; (b) electrical power storage means at said remote substation for storing the electrical power supplied over said conductor; (c) data collection means at said remote substation powered by said electrical storage means; (d) computer means at said central controller for periodically stopping the application of electrical power to said conductor and for sending data to and receiving data from said remote substation, wherein said remote substation includes computer means for sending data to and receiving data from said central controller; and (e) pull-up network means at both said remote substation and said central controller operative upon the removal of power from said conductor for raising the potential of said conductor except in the presence of data thereon to prevent false triggering of said computer means. - View Dependent Claims (2, 3, 4, 5)
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6. A powered communication link between a central controller and a remote substation comprising a single conductor having a movable or intermittent contact interacting between the central controller and the remote substation and further comprising:
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(a) power supply means located at the central controller for supplying electrical power over said conductor to said remote substation; (b) electrical power storage means at said remote substation for storing the electrical power supplied over said conductor; (c) multiplexing means at said central controller for periodically stopping the application of electrical power to said conductor to permit transmitter means located at the remote substation to send data over said conductor to said central controller; and (d) switching means including voltage level sensing means coupled to said conductor for connecting said conductor to said electrical power storage means when electrical pulses of a predetermined voltage level are being supplied over said conductor and for disconnecting said storage means from said conductor when said data is being transmitted. - View Dependent Claims (7, 8, 9, 10, 11)
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- 12. A powered communication link between a central controller and a remote substation comprising a single conductor having a movable or intermittent contact interacting therebetween, wherein said remote substation is powered by pulses of electrical power supplied by the central controller over the conductor, said pulses alternating with data messages transmitted between said central controller and said remote substation over said conductor, and including auxiliary signalling means for generating an alarm signal actuated by a switch at the remote substation mormally providing said alarm signal to the central controller over the conductor as part of a data message, and failsafe relay means at the remote substation triggered by a loss of electrical power for connecting said auxiliary signalling means directly to said conductor in the event of a loss of electrical power at said remote substation to generate said alarm signal independently of said data message.
Specification