Transceiver
First Claim
1. A data transceiver for transmitting interrogating signals to sequentially activate and poll a plurality of data transponders connected to a common telephone communication path and receiving and processing data from an activated transponder transmitting data, comprising,an input having means to transmit interrogating signals and operating power for the transponders through the communication path,temporary storage means connected to the input means to store the received data from the transponders,parity means connected to the temporary storage means to check parity of the received data,a comparator and a comparator memory connected to the temporary storage means for correcting ambiguities in the position of the errors in the received data,an output memory receiving the corrected data from the comparator,a data control connected to the input for controlling the data processing,means connected to the input to detect when a telephone connected to the path is activated by lifting its receiver "off hook" while signals and data are being transmitted,a supervisory information character generator connected to the input for providing identifying data corresponding to various operating conditions occurring in the operating sequence of said transceiver,a supervisory output memory connected to the supervisory character generator to store the identifying data,a common data output for receiving data from said output memories, anda data transfer circuit to multiplex the outputs of the output memories to the common data output.
1 Assignment
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Accused Products
Abstract
A data receiver for transmitting interrogating signals to activate in sequence a plurality of data transponders, receiving data from the transponders, processing the data, correcting the data, storing the data in a temporary memory, and delivering the data to output equipment. Preferably, the transceiver may be used with a switched telephone network. Means are provided to detect when the telephone subscriber goes "off hook" and releases the line to the subscriber. The transceiver includes means to detect failure of response and stores signals indicating failures. Means are provided to transmit a second interrogation signal in a polarity opposite to the first to overcome the effect of a reversed subscriber line pair.
16 Citations
15 Claims
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1. A data transceiver for transmitting interrogating signals to sequentially activate and poll a plurality of data transponders connected to a common telephone communication path and receiving and processing data from an activated transponder transmitting data, comprising,
an input having means to transmit interrogating signals and operating power for the transponders through the communication path, temporary storage means connected to the input means to store the received data from the transponders, parity means connected to the temporary storage means to check parity of the received data, a comparator and a comparator memory connected to the temporary storage means for correcting ambiguities in the position of the errors in the received data, an output memory receiving the corrected data from the comparator, a data control connected to the input for controlling the data processing, means connected to the input to detect when a telephone connected to the path is activated by lifting its receiver "off hook" while signals and data are being transmitted, a supervisory information character generator connected to the input for providing identifying data corresponding to various operating conditions occurring in the operating sequence of said transceiver, a supervisory output memory connected to the supervisory character generator to store the identifying data, a common data output for receiving data from said output memories, and a data transfer circuit to multiplex the outputs of the output memories to the common data output.
Specification