CN219322388U

CN219322388U - Functional circuit for improving compatibility of operation display terminal transmitter and receiver

Info

Publication number: CN219322388U
Application number: CN202223050684.5U
Authority: CN
Inventors: 李文奎; 王嘉言; 任殿坤; 郭宝贵; 卢广奇; 贾国强; 杨东方; 董振杰; 王东光; 李文
Original assignee: Chifeng Railway Branch Of Inner Mongolia Zhongdian Logistics Port Co ltd
Current assignee: Chifeng Railway Branch Of Inner Mongolia Zhongdian Logistics Port Co ltd
Priority date: 2022-11-17
Filing date: 2022-11-17
Publication date: 2023-07-07
Anticipated expiration: 2032-11-17

Abstract

The utility model relates to a functional circuit for improving the compatibility of a handset of an operation display terminal. The system comprises a power supply circuit, a singlechip minimum system, a serial port communication circuit, an operational amplifier circuit with adjustable gain, an external interface and a key detection circuit, and has the functions of realizing different output audio signal level values according to different operation display terminal versions and determining the switching working state of a call key according to the operation display terminal versions, and informing the call key state to the operation display terminal through an RS485 serial port mode and a TTL level mode. The method has the advantages that the compatibility of the transmitter and receiver of the locomotive integrated radio station in the railway wireless train dispatching is improved, so that the maintainability of the locomotive integrated radio station is improved, and the time cost caused by incompatibility of the transmitter and receiver is reduced; in addition, the application of the functional circuit also enables the headset to be used on operation display terminals with older software and hardware versions, so that the service cycle of the operation display terminals can be prolonged, and the cost for replacing equipment is saved.

Description

Functional circuit for improving compatibility of operation display terminal transmitter and receiver

Technical Field

The present utility model relates to a handset of an operation display terminal, and more particularly, to a functional circuit for improving compatibility of a handset of an operation display terminal.

Technical Field

The transmitter receiver is one of important necessary accessories of the locomotive integrated wireless communication equipment (CIR), a locomotive driver uses the transmitter receiver to carry out voice communication with a dispatcher/a station attendant/other locomotive drivers, and the transmitter receiver currently applied in the railway industry is the part 1 of the locomotive integrated wireless communication equipment which conforms to the railway standard QC/R651.1-2018: technical conditions, requirements for handsets in this standard: (1) audio output: level (effective value) 245mV (196 mV-294 mV), input impedance 600 Ω or 15mV (12 mV-18 mV); (2) 2 call key detection modes: RS485 or TTL. Therefore, the compatibility of the transmitter and receiver is extremely low, the transmitter and receiver cannot be switched between various operation display terminal versions, and the transmitter and receiver can only be used with a matched operation display terminal sleeve, otherwise, faults such as poor communication quality, invalid call keys and the like can possibly occur, so that when the transmitter and receiver suddenly breaks down in the operation process of a locomotive, the transmitter and receiver cannot be quickly provided, and the operation timeliness of the locomotive is seriously influenced.

Disclosure of Invention

In view of the problems existing in the prior art, the utility model provides a functional circuit for improving the compatibility of a handset of an operation display terminal, which is applied to the handset of a locomotive integrated radio station in a railway wireless train dispatching system, so that the handset has the capability of identifying the version of the operation display terminal, is switched to a working state according to version information, and can be efficiently improved, connected to any operation display terminal equipment and normally operated.

The functional circuit comprises a power circuit, a singlechip minimum system, a serial port communication circuit, an operational amplifier circuit with adjustable gain, an external interface and a key detection circuit, wherein the power circuit is connected with the singlechip minimum system and the serial port communication circuit by 5V, is connected with the operational amplifier circuit with adjustable gain by 3.3V, is connected with the operational amplifier circuit with adjustable gain in a unidirectional way, is connected with the serial port communication circuit RS232 serial port in a bidirectional way, is connected with an I/O port of the operational amplifier circuit with adjustable gain, is connected with an RS485 serial port of the external interface, is connected with audio output of the external interface, is connected with the serial port communication circuit and the RS485 serial port of the external interface respectively, and is used for acquiring audio signals through an XS3 external microphone core.

The operational amplifier circuit with adjustable gain is characterized in that an audio signal is firstly filtered for the first time through bypass capacitors C14 and C37, then filtered for the second time through an RC filter consisting of a resistor R21, a capacitor C15, a resistor R20 and a capacitor C12, and is input to the negative electrode of an N11, signal amplification output is carried out through a resistor R34, a resistor R32 and the N11, the opening or closing of an N8 is controlled according to a CTR signal output by a minimum system of a singlechip, when the N8 is opened, a resistor R39 is connected into the circuit, and forms a parallel circuit with the resistor R34, and the gain of the operational amplifier circuit with adjustable gain is 1.11; when N8 is closed, the resistor R39 is not connected into the circuit, the gain of the operational amplifier circuit with adjustable gain is 16, impedance matching is carried out through the resistor R22 after gain adjustment, and the output is output to the audio output end of the external interface.

The key detection circuit comprises a first relay K1, a first triode VT1, a second relay K3, a second triode VT2, four PTT keys S3, S6, S7, S8, a first calling plain station key S1 and a second calling plain station key S4, wherein the first calling dispatch key S2 and the second calling dispatch key S5, S1-S8 are connected to an I/O port of a single chip microcomputer minimum system, the positive pole of a diode VD1 of a first relay switch K1 is connected with the collector of the first triode VT1, the emitter of the first triode VT1 is grounded, the base of the first triode is respectively connected with one end of a capacitor C1, one end of the resistor R1 is grounded, the other end of the capacitor C1 is grounded, the other end of the resistor R1 is connected with the CRT3 end of the single chip microcomputer minimum system, the 13 end of the first relay switch K1 is connected with the first plain key S1, the 4 end of the first calling dispatch key S2, the positive pole of a diode VD2 of the second relay switch K3 is connected with the I/O port of the single chip microcomputer minimum system, the emitter of the second triode VT2 is grounded, the other end of the first triode VT2 is grounded, the other end of the resistor R1 is grounded, and the other end of the resistor R1 is connected with the CRT3, the other end of the resistor is grounded, and the other end of the resistor is connected with the other end of the resistor 3, and the resistor 3 is connected with the other end of the cathode of the single chip microcomputer 3.

The system has the functions of realizing different output audio signal level values according to different operation display terminal versions and determining the switching working state of the call keys according to the operation display terminal versions.

The system has the function of informing the call key state to the operation display terminal through an RS485 serial port mode and a TTL level mode.

The utility model has the beneficial effects that the compatibility of the transmitter and receiver of the locomotive integrated radio station in the railway wireless train dispatching is improved, thereby improving the maintainability of the locomotive integrated radio station and reducing the time cost caused by incompatibility of the transmitter and receiver; in addition, the application of the functional circuit also enables the headset to be used on operation display terminals with older software and hardware versions, so that the service cycle of the operation display terminals can be prolonged, and the cost for replacing equipment is saved.

Description of the drawings:

FIG. 1 is a block diagram of the circuit connections of the present utility model;

FIG. 2 is a schematic diagram of an adjustable gain operational amplifier circuit of the present utility model;

FIG. 3 is a schematic diagram of a single chip microcomputer minimum system and serial port communication circuit of the present utility model;

FIG. 4 is a schematic diagram of a power circuit of the present utility model;

fig. 5 is a schematic diagram of a key detection circuit of the present utility model.

Detailed Description

For a clearer understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples.

As shown in FIG. 1, the functional circuit for improving the compatibility of the operation display terminal handset comprises a power supply circuit, a singlechip minimum system, a serial port communication circuit, an operational amplifier circuit with adjustable gain, an external interface and a key detection circuit, wherein the power supply circuit is connected with the singlechip minimum system and the serial port communication circuit at 5V, is connected with the operational amplifier circuit with adjustable gain at 3.3V, the singlechip minimum system is connected with the operational amplifier circuit with adjustable gain in a unidirectional way, is connected with the serial port communication circuit RS232 serial port in a bidirectional way, is connected with the operational amplifier circuit I/O port with adjustable gain, is connected with the RS485 serial port of the external interface, is connected with the audio output of the external interface, is connected with the serial port communication circuit and the RS485 serial port of the external interface respectively, and is connected with the operational amplifier circuit with adjustable gain through the XS3 external microphone core to acquire audio signals.

When the transmitter-receiver is connected to the operation display terminal equipment, the singlechip sends a query instruction to the operation display terminal through an RS485 serial port communication mode, judges the version of the operation display terminal according to the returned information content, and simultaneously controls the access state of the call key detection circuit to determine whether to inform the operation display terminal of the corresponding call key pressing through a TTL level change mode or inform the operation display terminal of the corresponding call key pressing through an RS485 serial port mode; and judging the version of the operation display terminal according to the returned information content, and controlling the gain value of the operational amplifier circuit with adjustable gain so that the audio level value output externally is 15mv or 245mv.

Example 1

As shown in fig. 1 to 5, a transmitter and receiver is connected to an operation display terminal of a locomotive integrated radio station, an RS232 serial port of an N1 (model ATMEGA 8) of a minimum system of a single chip microcomputer is converted by an N2 (model SN 75176) to realize RS485 serial port communication, a query instruction is sent to the operation display terminal, the operation display terminal returns a state number of the operation display terminal, and the N1 of the minimum system of the single chip microcomputer controls high and low level states of the CTR, CTR2 and CTR3 ends according to the state number, so that switching of audio signal level and switching of a call key detection mode are realized. When the state number returned by the operation display terminal is A01, the SCM N1 controls the CTR end to be high level, the analog switch of the operational amplifier circuit N8 (model SN74LVC1G 66) with adjustable gain is closed, CTR3 is high level, the relay K1, the relay K2 and the relay K3 are closed, at the moment, the audio output level value of the headset is 24.5mv, and the operation display terminal judges whether a call key is pressed down or not in a TTL mode; when the state number returned by the operation display terminal is A02, controlling CTR to be high level by N1 of the minimum system of the singlechip, closing an analog switch of an operational amplifier circuit N8 with adjustable gain, controlling CTR3 to be low level, opening relays K1, K2 and K3, and judging whether a call key is pressed by the operation display terminal in an RS485 mode, wherein the audio output level value of the transmitter is 24.5 mv; when the state number returned by the operation display terminal is A03, an N1 control CTR of the minimum system of the singlechip is a low-level operational amplifier circuit N8 analog switch with adjustable gain, a CTR3 high level and relays K1, K2 and K3 are closed, at the moment, the audio output level value of the transmitter is 245mv, and the operation display terminal judges whether a call key is pressed down or not in a TTL mode; when the state number returned by the query operation display terminal is A04, the N1 controls CTR to be low level, the N8 analog switch is turned on, CTR3 is low level, the relays K1, K2 and K3 are turned on, at the moment, the audio output level value of the transmitter is 245mv, and the operation display terminal judges whether a call key is pressed down or not in an RS485 mode. The minimum system of the singlechip is changed from an RS232 serial port communication mode to an RS485 serial port communication mode through N2. When the transmitter and receiver judges whether the accessed operation display terminal needs to be pressed down by a TTL level judgment key, the minimum system of the singlechip can control CTR3 to be changed from low level to high level, so that K2 is communicated with pin 11 and pin 13, pin 4 is communicated with pin 6, pin 13 is communicated with pin 9, and pin 4 is communicated with pin 8. Therefore, the RS485 communication mode is cut off, and the detection key is changed from the RS485 mode to the TTL level mode by combining the key detection circuit.

Using the well-known C ^﹢﹢ Programming language, which is realized by keil programming software.

Claims

1. The utility model provides a promote operation display terminal handset compatibility's functional circuit, includes power supply circuit, singlechip minimum system, serial communication circuit, adjustable gain's operational amplifier circuit, to external interface and button detection circuit, its characterized in that: the power supply circuit is connected with a single chip microcomputer minimum system and a serial port communication circuit at 5V, is connected with an operational amplifier circuit with adjustable gain at 3.3V, is connected with the operational amplifier circuit with adjustable gain in one way, is connected with a serial port communication circuit RS232 serial port in two directions, is connected with an I/O port of the operational amplifier circuit with adjustable gain, is connected with an RS485 serial port of an external interface, is connected with an audio output of the external interface, is connected with a serial port communication circuit and an RS485 serial port of the external interface respectively, and is connected with an operational amplifier circuit with adjustable gain through an XS3 external microphone core to acquire audio signals.

2. A functional circuit for improving compatibility of a headset for an operation display terminal as set forth in claim 1 wherein: the gain-adjustable operational amplifier circuit comprises an audio signal, a bypass capacitor C14, a bypass capacitor C37, an RC filter composed of a resistor R21, a capacitor C15, a resistor R20 and a capacitor C12, a second filter, a negative electrode of an N11, a signal amplification output through a resistor R34, a resistor R32 and an N11, and a control of opening or closing of an N8 according to a CTR signal output by a minimum system of a singlechip, wherein when the N8 is opened, the resistor R39 is connected into the circuit to form a parallel circuit with the resistor R34, and the gain of the gain-adjustable operational amplifier circuit is 1.11; when N8 is closed, the resistor R39 is not connected into the circuit, the gain of the operational amplifier circuit with adjustable gain is 16, impedance matching is carried out through the resistor R22 after gain adjustment, and the output is output to the audio output end of the external interface.

3. A functional circuit for improving compatibility of a headset for an operation display terminal as set forth in claim 1 wherein: the key detection circuit comprises a first relay K1, a first triode VT1, a second relay K3, a second triode VT2, four PTT keys S3, S6, S7 and S8, a first calling plain station key S1 and a second calling plain station key S4, wherein the first calling dispatch key S2 and the second calling dispatch key S5 are connected to an I/O port of a single chip microcomputer minimum system, the positive pole of a diode VD1 of a first relay switch K1 is connected with the collector of the first triode VT1, the emitter of the first triode VT1 is grounded, the base is respectively connected with one end of a capacitor C1 and one end of a resistor R1, the other end of the capacitor C1 is grounded, the other end of the resistor R1 is connected with the CRT3 end of the single chip microcomputer minimum system, the 13 end of the first relay switch K1 is connected with the calling first plain station key S1, the 4 end is connected with the first calling dispatch key S2, the positive pole of a diode 2 of the second relay switch K3 is connected with the second triode VT2, the emitter of the second triode VT2 is grounded, the other end of the resistor R1 is connected with the other end of the resistor R3, and the other end of the resistor R3 is connected with the other end of the resistor R6, and the other end of the resistor R3 is connected with the other end of the resistor C6, and the other end of the resistor is connected with the cathode of the single chip microcomputer 3.

4. A functional circuit for improving the compatibility of a handset for an operation display terminal as defined in claim 1 or claim 2, wherein: the system has the functions of realizing different output audio signal level values according to different operation display terminal versions and determining the switching working state of the call keys according to the operation display terminal versions.

5. A functional circuit for improving the compatibility of a handset for an operation display terminal according to claim 1 or claim 3, wherein: the system has the function of informing the call key state to the operation display terminal through an RS485 serial port mode and a TTL level mode.