System for transmitting operating condition data from a passive station to a central station
First Claim
1. An operating condition data communication system comprisinga central station,a passive station dedicated to the control and acquisition of data of an electronic apparatus,said central station including means for establishing a connection to said passive station over a non-dedicated voice band-width communication link for transmitting commands to said passive station and for receiving responses from said passive station over said connection,said passive station including processing means operable whenever a connection is established with said central station to issue a ready signal to the central station inviting the central station to issue a command to said passive station,said processing means being operable for receiving and executing said commands from said central station and for transmitting responses to said commands to said central station,said passive station including a first alarm condition call-out means operable in response to the detection of an alarm condition at said passive station to initiate a call-out operation for establishing communication over a non-dedicated voice band-width communication link to said central station,the capability of said passive station to establish communication with said central station being limited to the establishment of the connection and the transmission of a ready signal to the central station inviting the central station to issue a command to the passive station.
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Accused Products
Abstract
The system includes a passive station dedicated to the control and acquisition of data of an electronic apparatus and arranged for communication with a central station over a non-dedicated voice band-width communication link with connections being established from the central station. The passive station includes means to initiate a call-out operation under alarm conditions, but the communication is limited to the establishment of the connection and the transmission of a ready signal to the central station inviting the central station to issue a command to the passive station to transmit information.
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Citations
13 Claims
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1. An operating condition data communication system comprising
a central station, a passive station dedicated to the control and acquisition of data of an electronic apparatus, said central station including means for establishing a connection to said passive station over a non-dedicated voice band-width communication link for transmitting commands to said passive station and for receiving responses from said passive station over said connection, said passive station including processing means operable whenever a connection is established with said central station to issue a ready signal to the central station inviting the central station to issue a command to said passive station, said processing means being operable for receiving and executing said commands from said central station and for transmitting responses to said commands to said central station, said passive station including a first alarm condition call-out means operable in response to the detection of an alarm condition at said passive station to initiate a call-out operation for establishing communication over a non-dedicated voice band-width communication link to said central station, the capability of said passive station to establish communication with said central station being limited to the establishment of the connection and the transmission of a ready signal to the central station inviting the central station to issue a command to the passive station.
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5. An operating condition communication system comprising
a central station, a passive station dedicated to the control and acquisition of data of a first electronic apparatus, said central station including means for establishing a connection to said passive station over a non-dedicated voice band-width communication link, said passive station being operable to receive a limited set of commands from said central station, said passive station including procesing means operable to execute said limited set of commands and to respond with a transfer of information to said central station including confirmation signals and any data requested by said commands, said passive station being operable to issue a ready signal to said central station whenever said processing means is cleared and said passive station is ready to receive a command, said passive station including a first timing means, said passive station including means to detect a transfer of information between said passive station and said central station and operable to reset said first timing means in response to detection of said transfer of information, said first timing means being operable in the absence of a reset for a predetermined time interval to clear said processing means and to cause said passive station to issue a ready signal to said central station.
Specification