An RFID system comprises at least one reading device (1) and at least one transponder (2, 2′, 2″, 2′″), which are configured for non-contact communication by means of modulated electromagnetic signals (SS), which contain data and/or commands packed in data frames, in which the reading device (1) is
An RFID system comprises at least one reading device (1) and at least one transponder (2, 2′, 2″, 2′″), which are configured for non-contact communication by means of modulated electromagnetic signals (SS), which contain data and/or commands packed in data frames, in which the reading device (1) is configured for transmitting a group of data frames (D-SYNC), which contain synchronization information (Preamble, Start Delimiter) for synchronization with the transponder (2, 2′, 2″, 2′″) and to transmit another group of data frames (D-NOSYNC) which do not contain such synchronization information, in which the transponder (2, 2′, 2″, 2′″) has synchronization means (14, 20, 21) which are configured to effect synchronization with the reading device (1) with the help of synchronization information (Preamble, Start Delimiter) contained in received data frames (D-SYNC) and synchronization status test means (15,15′,15″,22) configured for detecting whether the transponder runs synchronously with the reading device and in the event of it not running synchronously, to switch on the synchronization unit (14, 20, 21).
대표청구항▼
The invention claimed is: 1. An RFID device for non-contact communication with a reading device via modulated electromagnetic signals that contain at least one of data and commands packed in data frames, the RFID device comprising:synchronizing circuit configured to effect synchronization of the RFI
The invention claimed is: 1. An RFID device for non-contact communication with a reading device via modulated electromagnetic signals that contain at least one of data and commands packed in data frames, the RFID device comprising:synchronizing circuit configured to effect synchronization of the RFID device with the reading device responsive to receipt of a data frame containing synchronizing information from the reading device;a data control unit configured and arranged to, in response to receipt by the reading device of a data frame containing synchronizing information, receive data frames with the synchronization information removed by the synchronizing circuit and thereby not both receive and use at the data control unit the synchronization information for synchronization and configured and arranged to receive data frames from a command not containing synchronization information for effecting synchronization of the RFID device received by the reading device;synchronization status test circuit configured to detect whether the RFID device runs synchronously with the reading device and to switch on the synchronizing circuit responsive to detecting that the RFID device is not synchronized with the reading device,wherein the RFID device is configured to receive multiple different types of commands as groups of data frames from the reading device, and wherein at least one of the received commands does not contain synchronizing information for effecting synchronization of the RFID device with the reading device.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (19)
Johnson Neldon P., Apparatus and method for digital information transfer.
Reis Robert Steven (Palo Alto CA) Verma Vikram (Palo Alto CA) Mihovilovic Domingo Antonio (Mountain View CA) Bertrand Peter Scott (Palo Alto CA) Stevens Richard Kenneth (Cupertino CA), Communication system for communicating with tags.
Emi Tetsuichi (Ibaraki-ken JPX), Frequency hopping communication method and apparatus changing a hopping frequency as a result of a counted number of err.
Gornati Silvano (Casorezzo ITX) Betti Giorgio (Milano ITX) Sacchi Fabrizio (Pavia ITX) Vai Gianfranco (Pavia ITX) Zuffada Maurizio (Milano ITX), Method of automatically measuring the horizontal scan frequency of a composite synchronism signal, and an electronic cir.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.