RFID tags continuously actively send out radio frequency signals (400 MS once, the transmission frequency can be modified according to user requirements), and the transmission distance is long, each tag has a unique code. If the wireless signal emitted by the tag is within the effective measuring distance of the card reader, the wireless signal is received and decoded by the card reader through the antenna on the card reader. Then the card reader transmits the information to the management system or other monitoring system through TTL232/RS232/RS485/CAN bus/Ethernet/Wieg and-26/Wieg and-34/USB/GPRS interface.
The RFID active electronic tag has the highest sensitivity nowadays. It not only has the function of realizing temperature display, but also has the function of increasing temperature storage and putting forward, which highlights the online and offline working mode. It can also locate, recognize and alarm the targets such as cold chain vehicles or objects through the matching reader.
CR2032, CR2450 and CR2477 button batteries are used as power supply in the mature scheme of RFID active electronic tag industry. These button batteries have the characteristics of high energy density, high monomer voltage, low self-discharge rate, storage resistance and wide operating temperature range.
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