Transaction accounting of toll transactions in transponder systems
First Claim
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1. A method of tracking transactions in a system comprising an interrogator and a transponder having a transaction register, the method comprising the steps of:
- providing an interrogator and a transponder, said transponder having a transaction register, said transponder being remote from said interrogator;
providing a data-containing card insertable into said transponder for providing data to and receiving data from said transponder;
setting data from said data-containing card including a transaction count into said transaction register of said transponder;
sending an interrogation from said interrogator to said transponder;
in response to said interrogation from said interrogator to said responder, sending a response from said transponder to said interrogator;
modifying at said transponder said transaction count stored within said transaction register in response to an indication of said interrogation and response transaction being completed between said transponder and interrogator and communicated by said interrogator to said transponder;
sending from said transponder to said interrogator the modified transponder count stored in said transaction register; and
storing said modified transponder count in said data-containing card.
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Abstract
This invention allows a toll authority to monitor transaction numbers which are sent from a transponder (14) to an interrogator (12). By incrementing the transaction counter stored in the transponder with successful transactions the toll authority can ascertain whether accounting of a transaction has been missed (i.e., a transaction number missing from the sequence), or double-counted (i.e., two transactions with the same transaction number).
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Citations
7 Claims
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1. A method of tracking transactions in a system comprising an interrogator and a transponder having a transaction register, the method comprising the steps of:
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providing an interrogator and a transponder, said transponder having a transaction register, said transponder being remote from said interrogator;
providing a data-containing card insertable into said transponder for providing data to and receiving data from said transponder;
setting data from said data-containing card including a transaction count into said transaction register of said transponder;
sending an interrogation from said interrogator to said transponder;
in response to said interrogation from said interrogator to said responder, sending a response from said transponder to said interrogator;
modifying at said transponder said transaction count stored within said transaction register in response to an indication of said interrogation and response transaction being completed between said transponder and interrogator and communicated by said interrogator to said transponder;
sending from said transponder to said interrogator the modified transponder count stored in said transaction register; and
storing said modified transponder count in said data-containing card.- View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification