本文介绍了HITAGS第三代系统的基本配置情况。该系统使用100% ASK调制和二进制脉冲长度编码进行读写设备到应答器的数据传输，并采用强ASK调制及抗碰撞、曼彻斯特和双相编码进行应答器到读写设备的数据传输。系统中控制和数据处理单元负责载波信号的调制控制以及来自解调电路的数据处理。
HITAG S -- 3rd generation HITAG™ family
Modulation Read/Write Device to Transponder: 100 % ASK and Binary Pulse Length Coding
Modulation Transponder to Read/Write Device: Strong ASK modulation with Anticollision, Manchester and Biphase Coding
Basic System Configuration
The following block diagram shows in principle the HITAG system configuration
A control and data processing unit controls the modulation of the carrier signal and processes data coming back from the demodulator circuit.
Absorption modulation is used, when sending data to the read/write device.
To force the absorption of the magnetic field, the transponder in principle turns on/off an internal resistor.
With the resistor turned on, the physical state is named Modulator ON (loaded) otherwise Modulator OFF (unloaded.)
Two different codes are used for the transmission of data to the read/write device:
The first bit of the transmitted data always starts with the Modulator ON (loaded) state.
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