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Method and apparatus for transmitting status information between remote locations
| Details |
Inventors: Cookson, John A.; Schatzka, Richard L.; Echard, Richard A.; Scheer, Gary W.;
Assignee: Tetragenics, Inc. (Butte, MT)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A system for transmitting status information from a first location to a remote second location includes a monitoring device at the first location for monitoring the state of a plurality of relays or other devices that are capable of being in either an active or inactive state. The monitoring device produces a digital signal representative of the state of the relays. A first memory storage device contains a table of digital codes arranged so that a unique code is associated in a predetermined manner with each relay in each state. A processor is provided for processing the digital signal from the monitoring device and for accessing the table to retrieve the code associated with the present state of each relay. The processor also produces a first signal indicative of a change of state of any relay from the inactive to the active state. A transmitter transmits the codes retrieved from the processor in a predetermined sequence. An interrupt device is included that interrupts the transmission sequence in the presence of the first signal to cause the immediate transmission of the code associated with the relay that has changed from the inactive to the active state. A receiver at the remote second location receives the transmitted codes and verifies their validity by comparing the received codes to a table of expected codes contained in a second memory storage device. If the code received is valid, a decoder determines the relay and state represented and formulates and outputs a control word representative of the state of the monitored relays. If the code is invalid, an alarm signal is generated that inhibits the output of a control word. Once an alarm signal is generated, it is maintained until a valid code is received for each of the monitored relays without the reception of an intervening invalid code. Preferably, the transmission and reception of the codes are accomplished under control of a digital computer operating under program control. |
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DETAILED DESCRIPTION In accordance with the objects set forth above, a method and apparatus for transmitting status information relating to a plurality of devices from a first location to a remote second location is provided.
According to the method, a plurality of devices are monitored at the first location, each device being in either an active or inactive state.
A table of digital codes is assembled such that a distinct code is associated with each possible state of each device being monitored.
The present state of each device is determined and the proper digital code corresponding to that particular state for that particular device is assigned based on the determination.
Another determination is made as to whether or not any of the monitored devices has changed from the inactive to the active state since the last monitoring took place.
Each of the assigned digital codes determined by the monitored present state of each device is then transmitted in a predetermined sequence.
If, in fact, a change to the active state has occurred for any of the monitored devices, the predetermined sequence is interrupted to transmit the digital code associated with the active state for the device that has changed to the active state as the next transmission.
The transmitted digital codes are received at the second location in the order that they are transmitted.
The received codes are compared with an assembled table of codes to determine whether the received codes are valid information.
If the received code is valid, then decoding of the code takes place to determine the particular device and state represented by the transmitted digital code.
Once the decoding is accomplished, the status information based on the most recent code received is output from the system.
If any invalid code is received, the outputs from the system are inhibited so that so status information is output until validity of the information is reestablished.
The validity of the system is reestablished only after the reception of a valid digital code for each of the monitored devices
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