WO2024078056A1 - 一种报文可控型无源应答器及报文发送方法 - Google Patents

一种报文可控型无源应答器及报文发送方法 Download PDF

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Publication number
WO2024078056A1
WO2024078056A1 PCT/CN2023/105131 CN2023105131W WO2024078056A1 WO 2024078056 A1 WO2024078056 A1 WO 2024078056A1 CN 2023105131 W CN2023105131 W CN 2023105131W WO 2024078056 A1 WO2024078056 A1 WO 2024078056A1
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WIPO (PCT)
Prior art keywords
message
transponder
circuit
controllable
oscillation
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PCT/CN2023/105131
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English (en)
French (fr)
Inventor
董晓辉
肖茂波
吴坎
姜波
陈宏然
赵伟宏
詹雨博
刘国旭
郭小龙
冯慕白
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沈阳铁路信号有限责任公司
通号（西安）轨道交通工业集团有限公司
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Publication of WO2024078056A1 publication Critical patent/WO2024078056A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/59—Responders; Transponders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0483—Transmitters with multiple parallel paths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1607—Supply circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3822—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving specially adapted for use in vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/06—Notations for structuring of protocol data, e.g. abstract syntax notation one [ASN.1]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/08—Protocols for interworking; Protocol conversion

Definitions

  • the invention belongs to the technical field of railway communication signal transmission, and in particular relates to a message controllable passive transponder and a message sending method.
  • the transponder is an important device in the field of railway communication signals. It is laid in the middle of the train track. When the train passes over the transponder, it communicates with it wirelessly.
  • the transponder uses the principle of electromagnetic coupling to receive the energy emitted by the train's onboard antenna, converts it into electrical energy, and then sends its own message information back to the onboard device wirelessly, thereby realizing communication between the ground and the train.
  • the passive transponder stores a fixed passive message inside.
  • the passive transponder is not physically connected to the external device.
  • the message is written in advance wirelessly. When the train passes over the transponder, the passive message is sent.
  • the duration of sending the message is determined by the time the train passes over the transponder.
  • the message content of the passive transponder contains relevant information about the train's running line. The message is written and changed through the transponder message reading and writing tool. Under normal on-site application conditions, the message content is generally not changed.
  • passive transponders Due to the principle of passive transponders and the needs of field applications, the change of passive messages requires the use of external message reading and writing tools, and the way passive transponders send messages is passive, requiring an external antenna to radiate energy to activate the passive transponder.
  • passive transponders are required to actively send messages, and passive messages need to be changed multiple times, quickly, in real time, and in a controllable manner, such as the following situations: 1. Manufacturers need passive transponders as auxiliary equipment to send messages when conducting vehicle-mounted antenna production inspections. The duration and content of the transponder sending messages must be constantly changed according to program requirements to test the function and performance of the vehicle-mounted antenna; 2.
  • the present invention provides a message-controllable passive transponder and a message sending method.
  • the content and duration of the message sending can be changed, and various combination sending modes of multiple messages, different durations, continuous or intermittent can be performed, thereby realizing free control of the passive transponder message.
  • the main technical solutions adopted by the present invention include:
  • a message controllable passive transponder comprises a power conversion circuit, an impedance matching circuit, a communication circuit, a message generation/control circuit, and an oscillation transmission circuit.
  • the controllable transponder is powered by an external 5V DC power supply.
  • the controllable transponder is connected to a host computer.
  • the host computer sends message information and command information to the controllable transponder.
  • the communication circuit of the controllable transponder transmits the received message information and command information to the message generation/control circuit.
  • the message generation/control circuit converts the received message information into data conforming to the transponder message encoding protocol.
  • the message generation/control circuit forms a message transmission mode according to the command information.
  • the message generation/control circuit transmits the message information and the message transmission mode to the oscillation transmission circuit.
  • the oscillation transmission circuit transmits the message in a prescribed mode.
  • the power conversion circuit includes two low-dropout linear regulators LDO D1 and D2, which convert the 5V voltage into 3.0V and 1.8V to provide power for the controllable transponder.
  • the impedance matching circuit is composed of 2-4 groups of diode arrays to form the load of the controllable transponder, which is used to simulate the impedance of a common passive transponder.
  • the communication circuit is connected to the host computer via a USB communication line.
  • the communication circuit includes a USB to serial port chip U1.
  • the USB+ and USB- of the USB communication line are respectively connected to the USBDP and USBDM terminals of U1.
  • the USB signal is converted into a serial port signal after passing through U1, and the serial port signal is sent to the message generation/control circuit through the TXD and RXD terminals of U1.
  • the message generation/control circuit includes a complex programmable logic device CPLD U2, which receives message information and command information through TXD and RXD terminals. After receiving the message information, U2 generates 1023-bit data that complies with the transponder message encoding protocol DBPL, and the data is continuously transmitted to the oscillation transmission circuit through the DATA terminal of U2. After receiving the command information, U2 A level signal of 0 or 1 is transmitted to the oscillation sending circuit through the TK terminal to inform the oscillation sending circuit of the duration of message sending.
  • CPLD U2 complex programmable logic device
  • the oscillation sending circuit includes an LC oscillation network composed of an inductor, a capacitor, a transistor, and a field effect transistor, wherein the TK terminal is connected to the transistors T1 and T2, and when the TK terminal is at a high level 1, the LC oscillation circuit is driven to work, and when the TK terminal is at a low level 0, the LC oscillation circuit is stopped from working, and the DATA terminal is connected to the field effect transistors T3 and T4, and when the DATA terminal is at a high level 1, the oscillation circuit works at a high frequency oscillation frequency, and when the DATA terminal is at a low level 0, the oscillation circuit works at a low frequency oscillation frequency, and the high and low level changes of the DATA terminal generate the FSK message signal of the transponder.
  • the host computer transmits the message information and command information to be sent to the controllable transponder.
  • the controllable transponder receives one or more original messages, it encodes them in sequence to produce one or more groups of 1023-bit data, which are transmitted to the oscillation transmission circuit.
  • the controllable transponder parses the content of the command information and controls the TK end of the oscillation transmission circuit to generate a high or low level of 0 or 1.
  • TK 0, the controllable transponder does not send a message, and when TK is 1, the controllable transponder sends a message.
  • the message information is an original message that has not been encoded, which is one message or multiple messages, and the command information is to inform the controllable transponder of the time length for sending the message.
  • the present invention can change the content and duration of message sending by changing the message information and command information sent by the host computer, and can also perform various combined sending modes of multiple messages, different durations, continuous or intermittent, thereby realizing free control of passive transponder messages.
  • FIG1 is a block diagram of a message controllable passive transponder according to the present invention.
  • FIG. 2 is a functional block diagram of a power conversion circuit.
  • FIG3 is a block diagram of an impedance matching circuit.
  • FIG4 is a functional block diagram of a communication circuit.
  • FIG5 is a block diagram of a message generation/control circuit.
  • FIG6 is a block diagram of the oscillation transmission circuit.
  • the present invention provides a message controllable passive transponder, including a power conversion circuit, an impedance matching circuit, a communication circuit, a message generation/control circuit, and an oscillation transmission circuit.
  • the controllable transponder is powered by an external 5V DC power supply.
  • the controllable transponder is connected to a host computer.
  • the host computer sends message information and command information to the controllable transponder.
  • the communication circuit of the controllable transponder transmits the received message information and command information to the message generation/control circuit.
  • the message generation/control circuit converts the received message information into data that conforms to the transponder message encoding protocol.
  • the message generation/control circuit forms a message transmission mode according to the command information.
  • the message generation/control circuit transmits the message information and the message transmission mode to the oscillation transmission circuit.
  • the oscillation transmission circuit transmits the message in a prescribed manner.
  • the power conversion circuit the controllable transponder is powered by an external 5V DC power supply.
  • the power conversion circuit contains two LDOs (low dropout linear regulators) D1 and D2, which convert the 5V voltage into 3.0V and 1.8V to provide power for various parts inside the controllable transponder, so there is no need for external antenna radiation to provide energy.
  • LDOs low dropout linear regulators
  • the impedance matching circuit contains four groups of diode arrays with the same layout, which together constitute the load of the controllable transponder and are used to simulate the impedance of an ordinary passive transponder, thereby ensuring that the impedance of the controllable transponder is the same as that of the ordinary passive transponder.
  • the communication circuit the host computer sends message information and command information to the communication circuit of the controllable transponder through the USB communication line.
  • the communication circuit of the controllable transponder includes a USB-to-serial port chip U1.
  • the USB+ and USB- of the USB communication line are respectively connected to the USBDP and USBDM terminals of U1.
  • the USB signal is converted into a serial port signal after passing through U1, and the serial port signal is sent to the message generation/control circuit through the TXD and RXD terminals of U1.
  • the message generation/control circuit includes a complex programmable logic device (CPLD) U2, which receives message information and command information through the TXD and RXD terminals.
  • CPLD complex programmable logic device
  • U2 After receiving the message information, U2 generates 1023 bits of data that complies with the transponder message coding protocol (DBPL). The data is cyclically and continuously transmitted to the oscillation sending circuit through the DATA terminal of U2.
  • U2 transmits a level signal of 0 or 1 to the oscillation sending circuit through the TK terminal to inform the oscillation sending circuit of the duration of the message sending.
  • CPLD complex programmable logic device
  • the oscillation transmission circuit includes an LC oscillation network composed of an inductor, a capacitor, a transistor, and a field effect transistor.
  • the TK terminal is connected to transistors T1 and T2. When the TK terminal is at a high level 1, the LC oscillation circuit will be driven to work, and when the TK terminal is at a low level 0, the LC oscillation circuit will stop working.
  • the DATA terminal is connected to field effect transistors T3 and T4. When the DATA terminal is at a high level 1, the oscillation circuit works at a high frequency oscillation frequency, and when the DATA terminal is at a low level 0, the oscillation circuit works at a low frequency oscillation frequency.
  • the high and low levels of the DATA terminal change to generate the FSK message signal of the transponder.
  • the present invention also provides a message sending method using the passive transponder of the present invention.
  • the process of the controllable transponder sending a message is as follows: the host computer transmits the message information and command information to be sent to the controllable transponder.
  • the message information is the original message that has not been encoded yet, which can be one message or multiple messages.
  • the command information is to inform the controllable transponder of the length of time to send the message.
  • the controllable transponder When the controllable transponder receives one or more original messages, it will encode them in sequence to produce one or more groups of 1023-bit data, which are transmitted to the oscillation transmission circuit through the DATA terminal.
  • the controllable transponder parses the content of the command information and controls the TK terminal to generate a level of 0 or 1.
  • TK the controllable transponder does not send a message
  • TK the controllable transponder sends a message.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Near-Field Transmission Systems (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

一种报文可控型无源应答器及报文发送方法，属于铁路通信信号传输技术领域，包括电源转换电路、阻抗匹配电路、通信电路、报文产生/控制电路、振荡发送电路，可控应答器与上位机相连，上位机向可控应答器发送报文信息和命令信息，可控应答器的通信电路将接收到的报文信息和命令信息传送给报文产生/控制电路，报文产生/控制电路转换成符合应答器报文编码协议的数据、形成报文发送方式传送给振荡发送电路，振荡发送电路按照规定的方式发送报文。本发明通过改变上位机发送的报文信息和命令信息，可以改变报文发送的内容和时长，也可以进行多条报文、不同时长、连续或间断的各种组合发送模式，从而实现了对无源应答器报文的自由控制。

Description

一种报文可控型无源应答器及报文发送方法 技术领域
本发明属于铁路通信信号传输技术领域，尤其涉及一种报文可控型无源应答器及报文发送方法。
背景技术
应答器是铁路通信信号领域中的重要设备，它铺设在列车轨道中间，列车通过应答器上方时与其进行无线通信，应答器采用电磁耦合原理接收列车车载天线发射的能量，转化为电能后再将自身的报文信息通过无线方式发送回车载设备，从而实现地面与列车之间的通信。无源应答器内部存储一条固定的无源报文，无源应答器不与外部设备物理连接，报文通过无线方式提前写入，当列车通过应答器上方时发送该条无源报文，发送报文的时长由列车经过应答器上方的时间决定。无源应答器的报文内容包含列车运行线路的相关信息，报文通过应答器报文读写工具写入和更改，在现场正常应用条件下报文内容一般不进行变更。
由于无源应答器的原理和现场应用需要所限，无源报文的更改需要使用外部报文读写工具，并且无源应答器发送报文的方式属于被动方式，需要外部天线对无源应答器辐射能量将其激活，但在许多生产制造和实验室应用条件下需要无源应答器主动发送报文，并且需要多次、快速、实时、可控的改变无源报文，比如以下情况：1.制造厂商在进行车载天线生产检验时需要无源应答器作为辅助设备发送报文，应答器发送报文的时长和内容必须按照程序要求不停的变化以考验车载天线的功能和性能；2.铁路通信信号的设计单位在进行某条铁路通信信息编制时，需要在实验室的条件下模拟线路上多个无源应答器发送报文的情况，需要一台不用外部天线辐射并可以根据要求灵活变换报文的无源应答器完成该项工作。因此，亟需一种报文可控型无源应答器。
发明内容
鉴于现有技术的上述缺点、不足，本发明提供一种报文可控型无源应答器及报文发送方法，通过改变上位机发送的报文信息和命令信息，可以改变报文发送的内容和时长，也可以进行多条报文、不同时长、连续或间断的各种组合发送模式，从而实现了对无源应答器报文的自由控制。
为了达到上述目的，本发明采用的主要技术方案包括：
一种报文可控型无源应答器，包括电源转换电路、阻抗匹配电路、通信电路、报文产生/控制电路、振荡发送电路，可控应答器通过外部5V直流供电，可控应答器与上位机相连，上位机向可控应答器发送报文信息和命令信息，可控应答器的通信电路将接收到的报文信息和命令信息传送给报文产生/控制电路，报文产生/控制电路将接收到的报文信息转换成符合应答器报文编码协议的数据，同时报文产生/控制电路根据命令信息形成报文发送方式，报文产生/控制电路将报文信息和报文发送方式传送给振荡发送电路，振荡发送电路按照规定的方式发送报文。
进一步地，所述电源转换电路包括两个低压差线性稳压器LDO D1和D2，将5V电压转换为3.0V、1.8V为可控应答器提供电源。
进一步地，所述阻抗匹配电路由2-4组二极管阵列构成可控应答器的负载，用于模拟普通无源应答器的阻抗。
进一步地，所述通信电路通过USB通信线与上位机相连，通信电路包含USB转串口芯片U1，USB通信线的USB+和USB-分别连接U1的USBDP和USBDM端，USB信号经过U1后转换为串口信号，串口信号通过U1的TXD和RXD端发送给报文产生/控制电路。
进一步地，所述报文产生/控制电路包含复杂可编程逻辑器CPLD U2，通过TXD和RXD端接收报文信息和命令信息，U2接收到报文信息后产生符合应答器报文编码协议DBPL的1023位数据，该数据通过U2的DATA端循环不间断地传送给振荡发送电路，U2接收到命令信息后通 过TK端向振荡发送电路传送0或1的电平信号，用于告知振荡发送电路报文发送的时长。
进一步地，所述振荡发送电路包含由电感、电容、三极管、场效应管组成的LC振荡网络，其TK端连接三极管T1和T2，当TK端为高电平1时驱动LC振荡电路工作，当TK端为低电平0时停止LC振荡电路工作，其DATA端连接场效应管T3和T4，当DATA端为高电平1时振荡电路工作在高频振荡频率，当DATA端为低电平0时振荡电路工作在低频振荡频率，DATA端高低电平变化产生应答器的FSK报文信号。
采用所述的无源应答器发送报文的方法，上位机将要发送的报文信息和命令信息传送给可控应答器，当可控应答器接收到一条或多条原始报文后按顺序进行编码，生产一组或多组1023位数据，该数据传送给振荡发送电路，可控应答器解析命令信息的内容，控制振荡发送电路TK端产生0或1的高低电平，当TK为0时可控应答器不发送报文，当TK为1时可控应答器发送报文。
进一步地，所述报文信息为未进行编码的原始报文，为一条报文或多条报文，所述命令信息为告知可控应答器发送报文的时间长短。
本发明的有益效果是：本发明通过改变上位机发送的报文信息和命令信息，可以改变报文发送的内容和时长，也可以进行多条报文、不同时长、连续或间断的各种组合发送模式，从而实现了对无源应答器报文的自由控制。
附图说明
图1是本发明一种报文可控型无源应答器的原理框图。
图2是电源转换电路的原理框图。
图3是阻抗匹配电路的原理框图。
图4是通信电路的原理框图。
图5是报文产生/控制电路的原理框图。
图6是振荡发送电路的原理框图。
具体实施方式
为了更好的解释本发明，以便于理解，下面结合附图，通过具体实施方式，对本发明作详细描述。
如图1所示，本发明提供了一种报文可控型无源应答器，包括电源转换电路、阻抗匹配电路、通信电路、报文产生/控制电路、振荡发送电路，可控应答器通过外部5V直流供电，可控应答器与上位机相连，上位机向可控应答器发送报文信息和命令信息，可控应答器的通信电路将接收到的报文信息和命令信息传送给报文产生/控制电路，报文产生/控制电路将接收到的报文信息转换成符合应答器报文编码协议的数据，同时报文产生/控制电路根据命令信息形成报文发送方式，报文产生/控制电路将报文信息和报文发送方式传送给振荡发送电路，振荡发送电路按照规定的方式发送报文。
如图2所示，电源转换电路：可控应答器由外部5V直流供电，电源转换电路含有两个LDO(低压差线性稳压器)D1和D2，将5V电压转换为为3.0V及1.8V为可控应答器内部各部分提供电源，因此无需外部天线辐射提供能量。
如图3所示，阻抗匹配电路：阻抗匹配电路含有四组布局相同的二极管阵列，共同构成可控应答器的负载，用来模拟普通无源应答器的阻抗，从而保证可控应答器与普通无源应答器的阻抗相同。
如图4所示，通信电路：上位机通过USB通信线向可控应答器的通信电路发送报文信息和命令信息，可控应答器的通信电路包含USB转串口芯片U1，USB通信线的USB+和USB-分别连接U1的USBDP和USBDM端，USB信号经过U1后转换为串口信号，串口信号通过U1的TXD和RXD端发送给报文产生/控制电路。
如图5所示，报文产生/控制电路：报文产生/控制电路包含复杂可编程逻辑器(CPLD)U2，通过TXD和RXD端接收报文信息和命令信息， U2接收到报文信息后产生符合应答器报文编码协议(DBPL)的1023位数据，该数据通过U2的DATA端循环并不间断地传送给振荡发送电路，同时U2接收到命令信息后通过TK端向振荡发送电路传送0或1的电平信号，用来告知振荡发送电路报文发送的时长。
如图6所示，振荡发送电路：振荡发送电路包含由电感、电容、三极管、场效应管组成的LC振荡网络。TK端连接三极管T1和T2，当TK端为高电平1时将驱动LC振荡电路工作，当TK端为低电平0时将停止LC振荡电路工作。DATA端连接场效应管T3和T4，当DATA端为高电平1时振荡电路工作在高频振荡频率，当DATA端为低电平0时振荡电路工作在低频振荡频率，DATA端高低电平变化从而产生应答器的FSK报文信号。
本发明还提供了采用本发明无源应答器的报文发送方法，可控应答器发送报文的过程为：上位机把要发送的报文信息和命令信息传送给可控应答器，所述的报文信息是还未进行编码的原始报文，可以是一条报文或多条报文，所述的命令信息是告知可控应答器发送报文的时间长短。当可控应答器接收到一条或多条原始报文后将按顺序进行编码，生产一组或多组1023位数据，该数据通过DATA端传送给振荡发送电路。同时可控应答器解析命令信息的内容，控制TK端产生0或1的电平，当TK为0时可控应答器不发送报文，当TK为1时可控应答器发送报文。
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行改动、修改、替换和变型。

Claims (8)

  1. 一种报文可控型无源应答器，其特征在于：包括电源转换电路、阻抗匹配电路、通信电路、报文产生/控制电路、振荡发送电路，可控应答器通过外部5V直流供电，可控应答器与上位机相连，上位机向可控应答器发送报文信息和命令信息，可控应答器的通信电路将接收到的报文信息和命令信息传送给报文产生/控制电路，报文产生/控制电路将接收到的报文信息转换成符合应答器报文编码协议的数据，同时报文产生/控制电路根据命令信息形成报文发送方式，报文产生/控制电路将报文信息和报文发送方式传送给振荡发送电路，振荡发送电路按照规定的方式发送报文。
  2. 根据权利要求1所述的一种报文可控型无源应答器，其特征在于：所述电源转换电路包括两个低压差线性稳压器LDO D1和D2，将5V电压转换为3.0V、1.8V为可控应答器提供电源。
  3. 根据权利要求1所述的一种报文可控型无源应答器，其特征在于：所述阻抗匹配电路由2-4组二极管阵列构成可控应答器的负载，用于模拟普通无源应答器的阻抗。
  4. 根据权利要求1所述的一种报文可控型无源应答器，其特征在于：所述通信电路通过USB通信线与上位机相连，通信电路包含USB转串口芯片U1，USB通信线的USB+和USB-分别连接U1的USBDP和USBDM端，USB信号经过U1后转换为串口信号，串口信号通过U1的TXD和RXD端发送给报文产生/控制电路。
  5. 根据权利要求1所述的一种报文可控型无源应答器，其特征在于：所述报文产生/控制电路包含复杂可编程逻辑器CPLD U2，通过TXD和RXD端接收报文信息和命令信息，U2接收到报文信息后产生符合应答器报文编码协议DBPL的1023位数据，该数据通过U2的DATA端循环不间断地传送给振荡发送电路，U2接收到命令信息后通过TK端向振荡发送电路传送0或1的电平信号，用于告知振荡发送电路报文发送的时长。
  6. 根据权利要求1所述的一种报文可控型无源应答器，其特征在于： 所述振荡发送电路包含由电感、电容、三极管、场效应管组成的LC振荡网络，其TK端连接三极管T1和T2，当TK端为高电平1时驱动LC振荡电路工作，当TK端为低电平0时停止LC振荡电路工作，其DATA端连接场效应管T3和T4，当DATA端为高电平1时振荡电路工作在高频振荡频率，当DATA端为低电平0时振荡电路工作在低频振荡频率，DATA端高低电平变化产生应答器的FSK报文信号。
  7. 采用如权利要求1-6所述的无源应答器发送报文的方法，其特征在于：上位机将要发送的报文信息和命令信息传送给可控应答器，当可控应答器接收到一条或多条原始报文后按顺序进行编码，生产一组或多组1023位数据，该数据传送给振荡发送电路，可控应答器解析命令信息的内容，控制振荡发送电路TK端产生0或1的高低电平，当TK为0时可控应答器不发送报文，当TK为1时可控应答器发送报文。
  8. 根据权利要求7所述的发送报文的方法，其特征在于：所述报文信息为未进行编码的原始报文，为一条报文或多条报文，所述命令信息为告知可控应答器发送报文的时间长短。
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