CN102680230A - Circuit of long-distance steel belt precision transmission test detector - Google Patents

Abstract

The invention relates to a circuit of a long-distance steel belt precision transmission test detector. According to the circuit, a photoelectric encoder interface circuit is in signal connection with an input/output (I/O) port of a microcontroller; an analog-to-digital conversion circuit is in signal connection with the I/O port of the microcontroller and an address latch signal line; a data storage circuit, a liquid crystal display (LCD) interface circuit, a key interface circuit and a real-time circuit are respectively in signal connection with the I/O port of the microcontroller; an RS232 serial interface circuit is in signal connection with a serial port of the microcontroller; and a power circuit supplies power to the microcontroller. The circuit is specially used for measuring the rotating speed, the rotating direction and the pre-tightening force of drive hubs and driven hubs in a long-distance steel belt precision friction transmission test.

Description

Long apart from steel band precision drive test detector circuit

Technical field

The invention belongs to the detecting instrument technical field, be specifically related to a kind of length apart from steel band precision drive test detector circuit.

Background technology

Motion and transmission of power are the basic functions of mechanical system, and the mechanical drive of undertaking motion and transmission of power is the basis of whole mechanical industry.In mechanical drive, people have carried out long-term comparatively deep analysis and research to transmissions such as gear, chain, adhesive tapes.But these three kinds of mechanical drive are that like gear-driven obvious weak point its centre distance can not be too big because the limitation of itself is restricting the application in some field, and cost is high and working environment is required strict; Chain transmission is owing to influenced by polygon effect, and its transmission stability is poor, impact and vibration noise are bigger, and speed is lower, though the high speed chain is arranged, its complex structure, cost are high, uneconomical; The band transmission has can realize long distance motion and powerdriven characteristics; And have buffering, absorbing, motion is steady, noise is little, oil resistant, moisture resistance, advantage such as need not lubricate; But normal tape is owing to receive the influence of intrinsic Elastic Sliding characteristic own; Its transmission accuracy and transmission efficiency are lower, and transmission capacity is little, and the life-span is shorter.

Find that in the process of research paper making equipment and precision optical machinery checkout equipment still there are fatal problems such as transmission accuracy is not high, stroke is little, tractive force is little, poor synchronization in length apart from kinematic train, seriously restricting the exploitation of big fabric width detection of high precision and scanner.Propose to carry out long gordian technique and theoretical research for this reason, and hope to break through with using in the long new method that obtains on apart from the kind of drive through test apart from the steel band friction gearing.

Apart from regard to the Steel Belt Transmission, the form of transmitting movement and power mainly contains two kinds: tractive force transmission and friction force transmission with regard to long.The transmission stroke of tractive force transmission is limited by pulley diameters and twines the number of turns, and stroke is big more, and the number of turns is many more, and the change of line speed of transmission is inhomogeneous more, and the adjustment amount of strainer is quite big during big centre distance, and transmission accuracy is difficult to control.The action principle of friction force transmission is similar to the conventional belt transmission; But make a general survey of numerous for many years research situation to Steel Belt Transmission mechanism; Discovery still stays in the friction mechanism of normal tape transmission to the understanding of the friction gearing mechanism of steel band, still adopts Euler's formula when specifically designing.Steel band length is not exclusively the same with the friction mechanism of rope or belt apart from the friction mechanism of precision drive, the differentia influence on this just mechanism steel band realize long practical applications apart from precision drive.In addition, also be another gordian technique of Steel Belt Transmission to the Research of Fatigue Life of steel band, but also fewer in the research of carrying out at present.

At present, length still lacks deep theoretical research and application and development apart from the transmission of steel band precision friction.Therefore set up special-purpose length apart from steel band precision drive testing table, and researched and developed the relevant detection device, the friction gearing mechanism of steel band has been studied.Long major function apart from steel band precision drive test detecting device is: the rotating speed that detects steel band principal and subordinate wheel hub with turn to, suffered static pretightning force of steel band and dynamic tension are carried out online detection, LCD shows in real time, data storage and with the host computer interconnected communication.

The long subject matter that in design, overcomes apart from steel band precision friction transmission test detecting device is: the control of (1) principal and subordinate wheel range rate error; (2) to the space electromagnetic interference shield; (3) align the analog to digital conversion of negative analog signal; (4) software operation process simplification.

Special-purpose length is made up of sensor and hardware circuit apart from steel band precision friction transmission test detecting device, and sensor has two kinds of photoelectric encoder and LOAD CELLSs, respectively to speed, turn to and pretightning force (tension force) detects.Control system is carried out online detection through certain algorithm combination sensor signal, and the detector hardware circuit is a core component of system.

Summary of the invention

The present invention is directed to length apart from steel band precision friction transmission test bench, the length that a kind of special use of knowing clearly is provided is apart from steel band precision friction test testing circuit.

For solving the problems of the technologies described above, the concrete technical scheme that the present invention taked is:

Long apart from steel band precision drive test detector circuit, comprise microcontroller, photoelectric encoder interface circuit, analog to digital conversion circuit, data storage circuitry, power circuit, LCD display interface circuit, keystroke interface circuit, real-time time circuit and RS232 serial interface circuit.

The photoelectric encoder interface circuit is connected with micro controller I/O mouth signal; Analog to digital conversion circuit is connected with address latch signal line signal with micro controller I/O mouth; Data storage circuitry is connected with micro controller I/O mouth signal; The LCD display interface circuit is connected with micro controller I/O mouth signal, and the keystroke interface circuit is connected with micro controller I/O mouth signal, and the real-time time circuit is connected with micro controller I/O mouth signal; The RS232 serial interface circuit is connected with the rs 232 serial interface signal of microcontroller, and power circuit is supplied power to microcontroller.

It is the chip of AT89C52 that described microcontroller adopts the model of Atmel company.

Described photoelectric encoder interface circuit comprises the 7th filter capacitor C7; Drive hubs four-core interface P2, driven wheel hub four-core interface P3,4 pin of the end of the 7th filter capacitor C7, drive hubs four-core interface P2 are connected with power supply VCC with 4 pin of driven wheel hub four-core interface P3; The 7th filter capacitor C7 other end ground connection; 1 pin of drive hubs four-core interface P2 is connected with 13 pin of microcontroller, and 2 pin of drive hubs four-core interface P2 are connected with 15 pin of microcontroller, the 3 pin ground connection of drive hubs four-core interface P2; 1 pin of driven wheel hub four-core interface P3 is connected with 12 pin of microcontroller; 2 pin of driven wheel hub four-core interface P3 are connected with 14 pin of microcontroller, the 3 pin ground connection of driven wheel hub four-core interface P3, and 4 pin of driven wheel hub four-core interface P3 meet power supply VCC.

Described analog to digital conversion circuit comprises modulus conversion chip U5, two rising edge d type flip flop U6A, LOAD CELLS two core interface P4, strain bridge amplifying circuit two core interface P5, the 8th filter capacitor C8, the 9th filter capacitor C9; 14 pin of the end of the 8th filter capacitor C8, two rising edge d type flip flop U6A meet power supply VCC; The other end ground connection of the 8th filter capacitor C8, the end of the 9th filter capacitor C9,11 pin of modulus conversion chip U5 and 12 pin meet power supply VCC, the other end ground connection of the 9th filter capacitor C9; 2 pin of two rising edge d type flip flop U6A are connected with 6 pin of two rising edge d type flip flop U6A; 3 pin of two rising edge d type flip flop U6A are connected with 30 pin of microcontroller, and 5 pin of two rising edge d type flip flop U6A are connected with 10 pin of modulus conversion chip U5, and 6 pin of modulus conversion chip U5,22 pin are connected with 28 pin of microcontroller; 7 pin of modulus conversion chip U5 are connected with 27 pin of microcontroller; 8 pin of modulus conversion chip U5 are connected with 36 pin of microcontroller, and 9 pin of modulus conversion chip U5 are connected with 26 pin of microcontroller, 13 pin of modulus conversion chip U5,16 pin, 23 pin and 24 pin ground connection; 14 pin of modulus conversion chip U5 are connected with 38 pin of microcontroller; 15 pin of modulus conversion chip U5 are connected with 37 pin of microcontroller, and 17 pin of modulus conversion chip U5 are connected with 39 pin of microcontroller, and 18 pin of modulus conversion chip U5 are connected with 35 pin of microcontroller; 19 pin of modulus conversion chip U5 are connected with 34 pin of microcontroller; 20 pin of modulus conversion chip U5 are connected with 33 pin of microcontroller, and 21 pin of modulus conversion chip U5 are connected with 32 pin of microcontroller, and 25 pin of modulus conversion chip U5 are connected with 25 pin of microcontroller; 1 pin of LOAD CELLS two core interface P4 is connected with 27 pin of modulus conversion chip U5; 1 pin of strain bridge amplifying circuit two core interface P5 is connected with 26 pin of modulus conversion chip U5, the 2 pin ground connection of 2 pin of LOAD CELLS two core interface P4, strain bridge amplifying circuit two core interface P5, and the model of described modulus conversion chip U5 is ADC0809CCN.

Described data storage circuitry comprises data-carrier store U3, the tenth filter capacitor C10, the 4th pull-up resistor R4, the 5th pull-up resistor R5; 1 pin of data-carrier store U3,2 pin, 3 pin and 4 pin ground connection; The end of 7 pin of data-carrier store U3, the 5th pull-up resistor R5 is connected with 17 pin of microcontroller; Another termination power VCC of the 5th pull-up resistor R5; The end of 8 pin of data-carrier store U3, the 4th pull-up resistor R4 is connected with 16 pin of microcontroller, another termination power VCC of the 4th pull-up resistor R4, and the end of the tenth filter capacitor C10,5 pin of data-carrier store U3 meet power supply VCC; The 6 pin ground connection of the other end of the tenth filter capacitor C10, data-carrier store U3, the model of described data-carrier store U3 is AT24C08.

Described power circuit comprises 5V power interface J1, the 0th self-lock switch S0, the first electrolytic capacitor filter C1, the second filter capacitor C2; 1 pin of 5V power interface J1 is connected with 2 pin of the 0th self-lock switch S0; 1 pin of the 0th self-lock switch S0 meets power supply VCC; The termination power VCC of the positive pole of the first electrolytic capacitor filter C1, the second filter capacitor C2, the other end ground connection of the negative pole of the first electrolytic capacitor filter C1, the second filter capacitor C2.

Described LCD display interface circuit comprises LCD display 20 core interface P1, draws exclusion RP1, the 3rd potentiometer R3, the 11 filter capacitor C11, the 12 filter capacitor C12, the 13 filter capacitor C13 on first; 1 pin of LCD display 20 core interface P1, the end ground connection of the 12 filter capacitor C12; 2 pin of LCD display 20 core interface P1, another termination power VCC of the 12 filter capacitor C12; 3 pin of LCD display 20 core interface P1 are connected with an end of the non-resistance trimming end of the 3rd potentiometer R3; The other end of the resistance trimming end of the 3rd potentiometer R3, the non-resistance trimming end of the 3rd potentiometer R3 is connected with 18 pin of LCD display 20 core interface P1; 4 pin of LCD display 20 core interface P1 are connected with 6 pin of microcontroller; 5 pin of LCD display 20 core interface P1 are connected with 7 pin of microcontroller; 6 pin of LCD display 20 core interface P1 are connected with 8 pin of microcontroller; 7 pin of LCD display 20 core interface P1,1 pin of the first pull-up resistor RP1 are connected with 39 pin of microcontroller, and 8 pin of LCD display 20 core interface P1,2 pin of the first pull-up resistor RP1 are connected with 38 pin of microcontroller, and 9 pin of LCD display 20 core interface P1,3 pin of the first pull-up resistor RP1 are connected with 37 pin of microcontroller; 10 pin of LCD display 20 core interface P1,4 pin of the first pull-up resistor RP1 are connected with 36 pin of microcontroller; 11 pin of LCD display 20 core interface P1,5 pin of the first pull-up resistor RP1 are connected with 35 pin of microcontroller, and 12 pin of LCD display 20 core interface P1,6 pin of the first pull-up resistor RP1 are connected with 34 pin of microcontroller, and 13 pin of LCD display 20 core interface P1,7 pin of the first pull-up resistor RP1 are connected with 33 pin of microcontroller; 14 pin of LCD display 20 core interface P1,8 pin of the first pull-up resistor RP1 are connected with 32 pin of microcontroller; 19 pin of 15 pin of LCD display 20 core interface P1, LCD display 20 core interface P1, the termination power VCC of the 13 filter capacitor C13, the other end ground connection of the 13 filter capacitor C13, the 20 pin ground connection of LCD display 20 core interface P1; 0 pin of the first pull-up resistor RP1, the termination power VCC of the 11 filter capacitor C11, the other end ground connection of the 11 filter capacitor C11.

Described keystroke interface circuit comprises the first pull-up resistor R1, the second pull-up resistor R2, the 14 filter capacitor C14; The first keyswitch S1, the second keyswitch S2, the 3rd keyswitch S3; The 4th keyswitch S4, the 5th keyswitch S5, the 6th keyswitch S6; The termination power VCC of the 14 filter capacitor C14; The other end ground connection of the 14 filter capacitor C14; The termination power VCC of the first pull-up resistor R1; The end of the end of the end of the other end of the first pull-up resistor R1, the first keyswitch S1, the 3rd keyswitch S3, the 5th keyswitch S5 is connected with 4 pin of microcontroller; The end of the other end of the first keyswitch S1, the second keyswitch S2 is connected with 1 pin of microcontroller; The end of the other end of the 3rd keyswitch S3, the 4th keyswitch S4 is connected with 2 pin of microcontroller; The end of the other end of the 5th keyswitch S5, the 6th keyswitch S6 is connected with 3 pin of microcontroller, and the end of the other end of the other end of the second keyswitch S2, the 4th keyswitch S4, the other end of the 6th keyswitch S6, the second pull-up resistor R2 is connected with 5 pin of microcontroller, another termination power VCC of the second pull-up resistor R2.

Described real-time time circuit comprises clock chip U2, power supply BT1, the 15 filter capacitor C15, the 7th pull-up resistor R7, the 8th pull-up resistor R8, the 9th pull-up resistor R9, the second quartz crystal Y2; The termination power VCC of 1 pin of clock chip U2, the 9th filter capacitor C9; The other end ground connection of the 9th filter capacitor C9,2 pin of clock chip U2 are connected with the end of the second quartz crystal Y2, and 3 pin of clock chip U2 are connected with the other end of the second quartz crystal Y2; The 4 pin ground connection of clock chip U2; The end of 5 pin of clock chip U2, the 9th pull-up resistor R9 is connected with 21 pin of microcontroller, another termination power VCC of the 9th pull-up resistor R9, and the end of 6 pin of clock chip U2, the 8th pull-up resistor R8 is connected with 22 pin of microcontroller; Another termination power VCC of the 8th pull-up resistor R8; The end of 7 pin of clock chip U2, the 7th pull-up resistor R7 is connected with 23 pin of microcontroller, another termination power VCC of the 7th pull-up resistor R7, and 8 pin of clock chip U2 connect the positive pole of power supply BT1; The minus earth of power supply BT1, the model of described clock chip U2 are DS1302.

Described RS232 serial interface circuit comprises physical chip RS-232 transceiver U4, the 16 filter capacitor C16, the 17 multiplication of voltage charge pump capacitor C 17; The tenth octuple is pressed charge pump capacitor C 18; The 19 filter capacitor C19, the 20 filter capacitor C20, RS232 interface circuit 9 needle interface J2; The positive pole of the 17 multiplication of voltage charge pump capacitor C 17 is connected with 1 pin of physical chip RS-232 transceiver U4; The negative pole of the 17 multiplication of voltage charge pump capacitor C 17 is connected with 3 pin of physical chip RS-232 transceiver U4; The positive pole of the 16 filter capacitor C16 is connected with 2 pin of physical chip RS-232 transceiver U4; The negative pole of the 16 filter capacitor C16 meets power supply VCC; The tenth octuple presses the positive pole of charge pump capacitor C 18 to be connected with 4 pin of physical chip RS-232 transceiver U4, and the tenth octuple presses the negative pole of charge pump capacitor C 18 to be connected with 5 pin of physical chip RS-232 transceiver U4, and the negative pole of the 19 filter capacitor C19 is connected with 6 pin of physical chip RS-232 transceiver U4; The plus earth of the 19 filter capacitor C19; 11 pin of physical chip RS-232 transceiver U4 are connected with 11 pin of microcontroller, and 12 pin of physical chip RS-232 transceiver U4 are connected with 10 pin of microcontroller, and 13 pin of physical chip RS-232 transceiver U4 are connected with 3 pin of RS232 interface circuit nine kinds of needles interface J2; 14 pin of physical chip RS-232 transceiver U4 are connected with 2 pin of RS232 interface circuit nine kinds of needles interface J2; The 15 pin ground connection of physical chip RS-232 transceiver U4,16 pin of physical chip RS-232 transceiver U4, the termination power VCC of the 20 filter capacitor C20, the other end ground connection of the 20 filter capacitor C20; The 5 pin ground connection of RS232 interface circuit needle interface J2, the model of described physical chip RS-232 transceiver U4 is MAX232CPE.

Beneficial effect of the present invention:

(1) with strong points, be specifically designed to long apart from principal and subordinate's hub rotation speed in the steel band precision friction transmission test, turn to and the pretension force measurement;

(2) adopt 8 51 kernel single-chip microcomputers, cost is low, and performance is good;

(3) record data automatically, and be uploaded to host computer and do data analysis.

Description of drawings

Fig. 1 is the structural representation of use occasion of the present invention;

Fig. 2 is a circuit module synoptic diagram of the present invention;

Fig. 3 is the micro controller module synoptic diagram;

Fig. 4 is a photoelectric encoder interface module synoptic diagram;

Fig. 5 is the analog to digital conversion circuit module diagram;

Fig. 6 is the data storage circuitry module diagram;

Fig. 7 is the power circuit module diagram;

Fig. 8 is a LCD display interface circuit module diagram;

Fig. 9 is a keystroke interface circuit module synoptic diagram;

Figure 10 is a real-time time circuit module synoptic diagram;

Figure 11 is a RS232 serial interface circuit module synoptic diagram.

Embodiment

Below in conjunction with accompanying drawing the present invention is described further.

As shown in Figure 1, complete length comprises peripheral system 1 and microcontroller hardware circuit 2 apart from steel band precision drive test detector circuit.Peripheral system 1 comprises photoelectric encoder 1-1, LOAD CELLS 1-2, LCD display 1-3.Microcontroller hardware circuit 2 comprises microcontroller 2-1, photoelectric encoder interface circuit 2-2, analog to digital conversion circuit 2-3; Data storage circuitry 2-4, power circuit 2-5, LCD display interface circuit 2-6; Keystroke interface circuit 2-7; Real-time time circuit 2-8, RS232 serial interface circuit 2-9 is used for the input signal of sensor is handled; When length was tested sensors work apart from the steel band precision drive, microcontroller came the steel band operation conditions is detected through sensor input signal being carried out different processing.

As shown in Figure 2, microcontroller hardware circuit 2 comprises microcontroller 2-1, photoelectric encoder interface circuit 2-2; Analog to digital conversion circuit 2-3, data storage circuitry 2-4, power circuit 2-5; LCD display interface circuit 2-6; Keystroke interface circuit 2-7, real-time time circuit 2-8, RS232 serial interface circuit 2-9.

As shown in Figure 3, it is the singlechip chip of AT89C52 that described microcontroller adopts the model of Atmel company, and microcontroller 1,2,3,4,5 pin connect determinant keyboard; Carry out function selecting, affirmation and cancellation, microcontroller 6,7,8,30,32,33,34,35,36,37,38,39 pin connect the LCD display interface circuit, are used for controlling the data and the function demonstration of LCD display; Microcontroller 25,26,27,28,32,33,34,35,36,37,38,39 pin connect analog to digital conversion circuit, are used for controlling the conversion of LOAD CELLS input simulating signal and the input of digital quantity, and microcontroller 12,13,14,15 pin connect the photoelectric encoder interface circuit; Utilize external interrupt that the photoelectric encoder input pulse is counted; Calculate the rotating speed of principal and subordinate's wheel hub and turn to, microcontroller 16,17 pin connect data storage circuitry, and the survey data are stored; Microcontroller 10,11 pin connect RS232 serial interface circuit; Be used for communicating by letter with host computer, be sent to the survey data and carry out data processing in the host computer, microcontroller 21,22,23 pin connect the real-time time circuit; Obtain real-time time; Be shown on the LCD display, and store in the data chip flag data Measuring Time at a distance from a period of time.

As shown in Figure 4, the photoelectric encoder interface circuit comprises the 7th filter capacitor C7, drive hubs 4 core interface P2, driven wheel hub 4 core interface P3; 4 pin of the end of the 7th filter capacitor C7, drive hubs 4 core interface P2 are connected with power supply VCC with 4 pin of driven wheel hub 4 core interface P3; The 7th filter capacitor C7 other end ground connection; 1 pin of drive hubs 4 core interface P2 is connected with 13 pin of microcontroller, and 2 pin of drive hubs 4 core interface P2 are connected with 15 pin of microcontroller, the 3 pin ground connection of drive hubs 4 core interface P2; 4 pin of drive hubs 4 core interface P2 meet power supply VCC; 1 pin of driven wheel hub 4 core interface P3 is connected with 12 pin of microcontroller, and 2 pin of driven wheel hub 4 core interface P3 are connected with 14 pin of microcontroller, the 3 pin ground connection of driven wheel hub 4 core interface P3; 4 pin of driven wheel hub 4 core interface P3 meet power supply VCC; The 7th filter capacitor C7 adopts the X7R electric capacity of 0.1 μ F/50V, and the 7th filter capacitor C7 is used for carrying out Filtering Processing for the power supply of photoelectric encoder, and the photoelectric encoder interface circuit is used for carrying out the pulse signal transmission between photoelectric encoder and the microcontroller.

As shown in Figure 5, analog to digital conversion circuit comprises modulus conversion chip U5, two rising edge d type flip flop U6A, LOAD CELLS 2 core interface P4, strain bridge amplifying circuit 2 core interface P5, the 8th filter capacitor C8, the 9th filter capacitor C9; The end of the 8th filter capacitor C8,14 pin of two rising edge d type flip flops meet power supply VCC; The other end ground connection of the 8th filter capacitor C8; The end of the 9th filter capacitor C9,11 pin of modulus conversion chip U5 and 12 pin meet power supply VCC, the other end ground connection of the 9th filter capacitor C9, and 2 pin of two rising edge d type flip flop U6A are connected with 6 pin of two rising edge d type flip flop U6A; 3 pin of two rising edge d type flip flop U6A are connected with 30 pin of microcontroller; 5 pin of two rising edge d type flip flop U6A are connected with 10 pin of modulus conversion chip U5, and 6 pin of modulus conversion chip U5,22 pin are connected with 28 pin of microcontroller, and 7 pin of modulus conversion chip U5 are connected with 27 pin of microcontroller; 8 pin of modulus conversion chip U5 are connected with 36 pin of microcontroller; 9 pin of modulus conversion chip U5 are connected with 26 pin of microcontroller, 13 pin of modulus conversion chip U5,16 pin, 23 pin and 24 pin ground connection, and 14 pin of modulus conversion chip U5 are connected with 38 pin of microcontroller; 15 pin of modulus conversion chip U5 are connected with 37 pin of microcontroller; 17 pin of modulus conversion chip U5 are connected with 39 pin of microcontroller, and 18 pin of modulus conversion chip U5 are connected with 35 pin of microcontroller, and 19 pin of modulus conversion chip U5 are connected with 34 pin of microcontroller; 20 pin of modulus conversion chip U5 are connected with 33 pin of microcontroller; 21 pin of modulus conversion chip U5 are connected with 32 pin of microcontroller, and 25 pin of modulus conversion chip U5 are connected with 25 pin of microcontroller, and 1 pin of LOAD CELLS 2 core interface P4 is connected with 27 pin of modulus conversion chip U5; 1 pin of strain bridge amplifying circuit 2 core interface P5 is connected with 26 pin of modulus conversion chip U5; The 2 pin ground connection of 2 pin of LOAD CELLS 2 core interface P4 and strain bridge amplifying circuit 2 core interface P5, modulus conversion chip U5 adopts the ADC0809 chip of TEXAS INSTRUMENTS company, and two rising edge d type flip flop U6A adopt the SN74ALS74 chip of TEXAS INSTRUMENTS company; The 8th filter capacitor C8 adopts the X7R electric capacity of 0.1 μ F/50V; The 9th filter capacitor C9 adopts the X7R electric capacity of 0.1 μ F/50V, and the 8th filter capacitor C8 is used for carrying out Filtering Processing for the power supply of two rising edge d type flip flop U6A, and the 9th filter capacitor C9 is used for carrying out Filtering Processing for the power supply of modulus conversion chip U5; Two rising edge d type flip flop U6A are used for microcontroller output ale signal is carried out two divided-frequency, and analog to digital conversion circuit is used for the simulating signal of the simulating signal of LOAD CELLS transmission and the transmission of strain bridge amplifying circuit is carried out analog to digital conversion.

As shown in Figure 6, data storage circuitry comprises data-carrier store U3, the tenth filter capacitor C10, the 4th pull-up resistor R4, the 5th pull-up resistor R5; 1 pin of data-carrier store U3,2 pin, 3 pin and 4 pin ground connection; The end of 7 pin of data-carrier store U3, the 5th pull-up resistor R5 is connected with 17 pin of microcontroller; Another termination power VCC of the 5th pull-up resistor R5, the end of 8 pin of data-carrier store U3, the 4th pull-up resistor R4 is connected with 16 pin of microcontroller, another termination power VCC of the 4th pull-up resistor R4; The end of the tenth filter capacitor C10,5 pin of data-carrier store U3 meet power supply VCC; The 6 pin ground connection of the other end of the tenth filter capacitor C10, data-carrier store U3, data-carrier store U3 adopts the AT24C08 chip of Atmel company, and the tenth filter capacitor C10 adopts the X7R electric capacity of 0.1 μ F/50V; The 4th pull-up resistor R4 adopts 4.7K Ω resistance; The 5th pull-up resistor R5 adopts 4.7K Ω resistance, and the tenth filter capacitor C10 is used for carrying out Filtering Processing for the power supply of AT24C08 chip, the 4th pull-up resistor R4 and the 5th pull-up resistor R5 pull-up resistor during as the communication of AT24C08 chip I 2C agreement; Data storage circuitry adopts the I2C agreement, is used for storing long apart from the detected in the course of the work data of steel band precision friction detecting device.

As shown in Figure 7, power circuit comprises 5V power interface J1, the 0th self-lock switch S0, the first electrolytic capacitor filter C1, the second filter capacitor C2; 1 pin of+5V power interface J1 is connected with 2 pin of the 0th self-lock switch S0; 1 pin of the 0th self-lock switch S0 meets power supply VCC; The termination power VCC of the positive pole of the first electrolytic capacitor filter C1, the second filter capacitor C2; The other end ground connection of the negative pole of the first electrolytic capacitor filter C1, the second filter capacitor C2; The first filter capacitor C1 adopts the X7R electric capacity of 0.1 μ F/50V, and the second filter capacitor C2 adopts the X7R electric capacity of 10 μ F/50V, and the first filter capacitor C1 and the second filter capacitor C2 are used for carrying out Filtering Processing for the 5V power supply.

As shown in Figure 8, the LCD display interface circuit comprises LCD display 20 core interface P1, draws exclusion RP1, the 3rd potentiometer R3, the 11 filter capacitor C11, the 12 filter capacitor C12, the 13 filter capacitor C13 on first; 1 pin of LCD display 20 core interface P1, the end ground connection of the 12 filter capacitor C12; 2 pin of LCD display 20 core interface P1, another termination power VCC of the 12 filter capacitor C12; 3 pin of LCD display 20 core interface P1 are connected with an end of the non-resistance trimming end of the 3rd potentiometer R3; The other end of the resistance trimming end of the 3rd potentiometer R3, the non-resistance trimming end of the 3rd potentiometer R3 is connected with 18 pin of LCD display 20 core interface P1, and 4 pin of LCD display 20 core interface P1 are connected with 6 pin of microcontroller, and 5 pin of LCD display 20 core interface P1 are connected with 7 pin of microcontroller; 6 pin of LCD display 20 core interface P1 are connected with 8 pin of microcontroller; 7 pin of LCD display 20 core interface P1,1 pin of the first pull-up resistor RP1 are connected with 39 pin of microcontroller, and 8 pin of LCD display 20 core interface P1,2 pin of the first pull-up resistor RP1 are connected with 38 pin of microcontroller, and 9 pin of LCD display 20 core interface P1,3 pin of the first pull-up resistor RP1 are connected with 37 pin of microcontroller; 10 pin of LCD display 20 core interface P1,4 pin of the first pull-up resistor RP1 are connected with 36 pin of microcontroller; 11 pin of LCD display 20 core interface P1,5 pin of the first pull-up resistor RP1 are connected with 35 pin of microcontroller, and 12 pin of LCD display 20 core interface P1,6 pin of the first pull-up resistor RP1 are connected with 34 pin of microcontroller, and 13 pin of LCD display 20 core interface P1,7 pin of the first pull-up resistor RP1 are connected with 33 pin of microcontroller; 14 pin of LCD display 20 core interface P1,8 pin of the first pull-up resistor RP1 are connected with 32 pin of microcontroller; 19 pin of 15 pin of LCD display 20 core interface P1, LCD display 20 core interface P1, the termination power VCC of the 13 filter capacitor C13, the other end ground connection of the 13 filter capacitor C13, the 20 pin ground connection of LCD display 20 core interface P1; 0 pin of the first pull-up resistor RP1, the termination power VCC of the 11 filter capacitor C11; The other end ground connection of the 11 filter capacitor C11 draws on first exclusion RP1 to adopt the 9 pin exclusions of 8*4.7K Ω, is used for improving the driving force of the P0 mouth of microcontroller; The 3rd potentiometer R3 adopts 10K Ω potentiometer; Be used for regulating lcd screen brightness, the 11 filter capacitor C11 adopts the X7R electric capacity of 0.1 μ F/50V, is used on first, drawing the power supply of exclusion RP1 to carry out Filtering Processing; Make microcontroller P0 mouth high level can stablize output; The 12 filter capacitor C12 adopts the X7R electric capacity of 0.1 μ F/50V, is used for LCD display module power supply is carried out Filtering Processing, and the 13 filter capacitor C13 adopts the X7R electric capacity of 0.1 μ F/50V; Be used for filtering is carried out in LCD display module serial paralled interface mode selecting side; Prevent the unexpected conversion of interface mode, the LCD display interface circuit is used to connect LCD display and microcontroller, shows long apart from steel band precision friction transmission detector functions table and real time data.

As shown in Figure 9, the keystroke interface circuit comprises the first pull-up resistor R1, the second pull-up resistor R2, the 14 filter capacitor C14; The first keyswitch S1, the second keyswitch S2, the 3rd keyswitch S3; The 4th keyswitch S4, the 5th keyswitch S5, the 6th keyswitch S6; The termination power VCC of the 14 filter capacitor C14; The other end ground connection of the 14 filter capacitor C14; The termination power VCC of the first pull-up resistor R1; The end of the end of the end of the other end of the first pull-up resistor R1, the first keyswitch S1, the 3rd keyswitch S3, the 5th keyswitch S5 is connected with 4 pin of microcontroller; The end of the other end of the first keyswitch S1, the second keyswitch S2 is connected with 1 pin of microcontroller, and the end of the other end of the 3rd keyswitch S3, the 4th keyswitch S4 is connected with 2 pin of microcontroller, and the end of the other end of the 5th keyswitch S5, the 6th keyswitch S6 is connected with 3 pin of microcontroller; The end of the other end of the other end of the other end of the second keyswitch S2, the 4th keyswitch S4, the 6th keyswitch S6, the second pull-up resistor R2 is connected with 5 pin of microcontroller; Another termination power VCC of the second pull-up resistor R2, the 14 filter capacitor C14 adopts the X7R electric capacity of 0.1 μ F/50V, and the first pull-up resistor R1 adopts 10K Ω resistance; Second pull-up resistor adopts 10K Ω resistance; The first pull-up resistor R1 and the second pull-up resistor R2 are used to provide button voltage and restrictive ports electric current, and the 14 filter capacitor C14 is used for the keystroke interface circuit power is carried out filtering, and the keystroke interface circuit is used to produce push button signalling.

Shown in figure 10, the real-time time circuit comprises clock chip U2, power supply BT1, the 15 filter capacitor C15, the 7th pull-up resistor R7, the 8th pull-up resistor R8, the 9th pull-up resistor R9, the second quartz crystal Y2; The termination power VCC of 1 pin of clock chip U2, the 9th filter capacitor C9, the other end ground connection of the 9th filter capacitor C9,2 pin of clock chip U2 are connected with the end of the second quartz crystal Y2; 3 pin of clock chip U2 are connected with the other end of the second quartz crystal Y2, the 4 pin ground connection of clock chip U2, and the end of 5 pin of clock chip U2, the 9th pull-up resistor R9 is connected with 21 pin of microcontroller; Another termination power VCC of the 9th pull-up resistor R9; The end of 6 pin of clock chip U2, the 8th pull-up resistor R8 is connected with 22 pin of microcontroller, another termination power VCC of the 8th pull-up resistor R8, and the end of 7 pin of clock chip U2, the 7th pull-up resistor R7 is connected with 23 pin of microcontroller; Another termination power VCC of the 7th pull-up resistor R7; 8 pin of clock chip U2 connect the positive pole of power supply BT1, the minus earth of power supply BT1, and clock chip U2 adopts the DS1302 chip of DALLAS company; Power supply BT1 uses 3.6V charging dry cell; The 15 filter capacitor C15 adopts the X7R electric capacity of 0.1 μ F/50V, and the 7th pull-up resistor R7, eight pull-up resistor R8, the 9th pull-up resistor R9 adopt 4.7K Ω resistance, and second quartz crystal adopts the quartz crystal of 32.768KHz; Power supply BT1 is used for when detecting device cuts off the power supply, giving clock chip U2 power supply; The 15 filter capacitor C15 is used for the power supply VCC of clock chip U2 and BT1 are carried out Filtering Processing, the 7th pull-up resistor R7, the 8th pull-up resistor R8 and the 9th pull-up resistor R9 pull-up resistor during as the clock chip data transmission, and the second quartz crystal Y2 is used to produce the external clock pulse signal of clock chip U2; The real-time time circuit is used to produce real-time time, and the real-time time that detects data is provided.

Shown in figure 11; The RS232 serial interface circuit comprises physical chip RS-232 transceiver U4, the 16 filter capacitor C16, the 17 multiplication of voltage charge pump capacitor C 17; The tenth octuple is pressed charge pump capacitor C 18; The 19 filter capacitor C19, the 20 filter capacitor C20, RS232 interface circuit 9 needle interface J2; The positive pole of the 17 multiplication of voltage charge pump capacitor C 17 is connected with 1 pin of physical chip RS-232 transceiver U4; The negative pole of the 17 multiplication of voltage charge pump capacitor C 17 is connected with 3 pin of physical chip RS-232 transceiver U4; The positive pole of the 16 filter capacitor C16 is connected with 2 pin of physical chip RS-232 transceiver U4, and the negative pole of the 16 filter capacitor C16 meets power supply VCC, and the tenth octuple presses the positive pole of charge pump capacitor C 18 to be connected with 4 pin of physical chip RS-232 transceiver U4; The tenth octuple presses the negative pole of charge pump capacitor C 18 to be connected with 5 pin of physical chip RS-232 transceiver U4; The negative pole of the 19 filter capacitor C19 is connected with 6 pin of physical chip RS-232 transceiver U4, the plus earth of the 19 filter capacitor C19, and 11 pin of physical chip RS-232 transceiver U4 are connected with 11 pin of microcontroller; 12 pin of physical chip RS-232 transceiver U4 are connected with 10 pin of microcontroller; 13 pin of physical chip RS-232 transceiver U4 are connected with 3 pin of RS232 interface circuit 9 needle interface J2, and 14 pin of physical chip RS-232 transceiver U4 are connected with 2 pin of RS232 interface circuit 9 needle interface J2, the 15 pin ground connection of physical chip RS-232 transceiver U4; 16 pin of physical chip RS-232 transceiver U4, the termination power VCC of the 20 filter capacitor C20; The other end ground connection of the 20 filter capacitor C20, the 5 pin ground connection of RS232 interface circuit needle interface J2, the 17 multiplication of voltage charge pump capacitor C 17 adopts the X7R electric capacity of 1 μ F/50V; The 16 filter capacitor C16 adopts the X7R electric capacity of 0.1 μ F/50V; Be used for the MAX232 chip power is carried out filtering, the tenth octuple presses charge pump capacitor C 18 to adopt the X7R electric capacity of 1 μ F/50V, and the 19 filter capacitor C19 adopts the X7R electric capacity of 0.1 μ F/50V; Be used for the MAX232 chip power is carried out filtering; The RS-232 transceiver adopts the MAX232 chip of Maxim company, carries out the transmission and the reception of serial signal, and the 20 filter capacitor C20 adopts the X7R electric capacity of 0.1 μ F/50V; Be used for RS232 interface power unit is carried out filtering, the RS232 interface circuit is used for microcontroller and host computer carries out data transmission.

The course of work of the present invention is: after the 0th self-lock switch S0 was pressed, 5V power supply VCC began to microcontroller, photoelectric encoder, LCD display, real-time timepiece chip, two rising edge d type flip flop, storage chip, RS-232 transceiver and modulus conversion chip power supply.Microcontroller AT89C52 powers on; Program brings into operation, and after the initialization of microcontroller internal module was accomplished, the pulse signal of photoelectric encoder output was counted processing by microcontroller; Interrupt Calculation Speed through timer, turn to judgement according to the phase differential of pulse signal.Analog to digital conversion circuit carries out digital-to-analog conversion to the pretightning force simulating signal of input.Microcontroller reads Measuring Time from real-time timepiece chip.Pin-saving chip to rotating speed, turn to, pretightning force, stress, time data store.Be transferred to host computer through the RS232 interface and carry out data analysis.The LCD that is connect through the LCD display interface is through menu option, shows real time data or communicates by letter with host computer.

Claims (1)

1. long apart from steel band precision drive test detector circuit; Comprise microcontroller, photoelectric encoder interface circuit, analog to digital conversion circuit, data storage circuitry, power circuit, LCD display interface circuit, keystroke interface circuit, real-time time circuit and RS232 serial interface circuit, it is characterized in that:

The photoelectric encoder interface circuit is connected with micro controller I/O mouth signal; Analog to digital conversion circuit is connected with address latch signal line signal with micro controller I/O mouth; Data storage circuitry is connected with micro controller I/O mouth signal; The LCD display interface circuit is connected with micro controller I/O mouth signal, and the keystroke interface circuit is connected with micro controller I/O mouth signal, and the real-time time circuit is connected with micro controller I/O mouth signal; The RS232 serial interface circuit is connected with the rs 232 serial interface signal of microcontroller, and power circuit is supplied power to microcontroller;

It is the chip of AT89C52 that described microcontroller adopts the model of Atmel company;

Described photoelectric encoder interface circuit comprises the 7th filter capacitor C7; Drive hubs four-core interface P2, driven wheel hub four-core interface P3,4 pin of the end of the 7th filter capacitor C7, drive hubs four-core interface P2 are connected with power supply VCC with 4 pin of driven wheel hub four-core interface P3; The 7th filter capacitor C7 other end ground connection; 1 pin of drive hubs four-core interface P2 is connected with 13 pin of microcontroller, and 2 pin of drive hubs four-core interface P2 are connected with 15 pin of microcontroller, the 3 pin ground connection of drive hubs four-core interface P2; 1 pin of driven wheel hub four-core interface P3 is connected with 12 pin of microcontroller; 2 pin of driven wheel hub four-core interface P3 are connected with 14 pin of microcontroller, the 3 pin ground connection of driven wheel hub four-core interface P3, and 4 pin of driven wheel hub four-core interface P3 meet power supply VCC;

Described analog to digital conversion circuit comprises modulus conversion chip U5, two rising edge d type flip flop U6A, LOAD CELLS two core interface P4, strain bridge amplifying circuit two core interface P5, the 8th filter capacitor C8, the 9th filter capacitor C9; 14 pin of the end of the 8th filter capacitor C8, two rising edge d type flip flop U6A meet power supply VCC; The other end ground connection of the 8th filter capacitor C8; The end of the 9th filter capacitor C9,11 pin of modulus conversion chip U5 and 12 pin meet power supply VCC, the other end ground connection of the 9th filter capacitor C9, and 2 pin of two rising edge d type flip flop U6A are connected with 6 pin of two rising edge d type flip flop U6A; 3 pin of two rising edge d type flip flop U6A are connected with 30 pin of microcontroller; 5 pin of two rising edge d type flip flop U6A are connected with 10 pin of modulus conversion chip U5, and 6 pin of modulus conversion chip U5,22 pin are connected with 28 pin of microcontroller, and 7 pin of modulus conversion chip U5 are connected with 27 pin of microcontroller; 8 pin of modulus conversion chip U5 are connected with 36 pin of microcontroller; 9 pin of modulus conversion chip U5 are connected with 26 pin of microcontroller, 13 pin of modulus conversion chip U5,16 pin, 23 pin and 24 pin ground connection, and 14 pin of modulus conversion chip U5 are connected with 38 pin of microcontroller; 15 pin of modulus conversion chip U5 are connected with 37 pin of microcontroller; 17 pin of modulus conversion chip U5 are connected with 39 pin of microcontroller, and 18 pin of modulus conversion chip U5 are connected with 35 pin of microcontroller, and 19 pin of modulus conversion chip U5 are connected with 34 pin of microcontroller; 20 pin of modulus conversion chip U5 are connected with 33 pin of microcontroller; 21 pin of modulus conversion chip U5 are connected with 32 pin of microcontroller, and 25 pin of modulus conversion chip U5 are connected with 25 pin of microcontroller, and 1 pin of LOAD CELLS two core interface P4 is connected with 27 pin of modulus conversion chip U5; 1 pin of strain bridge amplifying circuit two core interface P5 is connected with 26 pin of modulus conversion chip U5; The 2 pin ground connection of 2 pin of LOAD CELLS two core interface P4, strain bridge amplifying circuit two core interface P5, the model of described modulus conversion chip U5 is ADC0809CCN, the model of two rising edge d type flip flop U6A is SN74ALS74;

Described data storage circuitry comprises data-carrier store U3, the tenth filter capacitor C10, the 4th pull-up resistor R4, the 5th pull-up resistor R5; 1 pin of data-carrier store U3,2 pin, 3 pin and 4 pin ground connection; The end of 7 pin of data-carrier store U3, the 5th pull-up resistor R5 is connected with 17 pin of microcontroller; Another termination power VCC of the 5th pull-up resistor R5; The end of 8 pin of data-carrier store U3, the 4th pull-up resistor R4 is connected with 16 pin of microcontroller, another termination power VCC of the 4th pull-up resistor R4, and the end of the tenth filter capacitor C10,5 pin of data-carrier store U3 meet power supply VCC; The 6 pin ground connection of the other end of the tenth filter capacitor C10, data-carrier store U3, the model of described data-carrier store U3 is AT24C08;

Described power circuit comprises 5V power interface J1, the 0th self-lock switch S0, the first electrolytic capacitor filter C1, the second filter capacitor C2; 1 pin of 5V power interface J1 is connected with 2 pin of the 0th self-lock switch S0; 1 pin of the 0th self-lock switch S0 meets power supply VCC; The termination power VCC of the positive pole of the first electrolytic capacitor filter C1, the second filter capacitor C2, the other end ground connection of the negative pole of the first electrolytic capacitor filter C1, the second filter capacitor C2;

Described LCD display interface circuit comprises LCD display 20 core interface P1, draws exclusion RP1, the 3rd potentiometer R3, the 11 filter capacitor C11, the 12 filter capacitor C12, the 13 filter capacitor C13 on first; 1 pin of LCD display 20 core interface P1, the end ground connection of the 12 filter capacitor C12; 2 pin of LCD display 20 core interface P1, another termination power VCC of the 12 filter capacitor C12; 3 pin of LCD display 20 core interface P1 are connected with an end of the non-resistance trimming end of the 3rd potentiometer R3; The other end of the resistance trimming end of the 3rd potentiometer R3, the non-resistance trimming end of the 3rd potentiometer R3 is connected with 18 pin of LCD display 20 core interface P1; 4 pin of LCD display 20 core interface P1 are connected with 6 pin of microcontroller; 5 pin of LCD display 20 core interface P1 are connected with 7 pin of microcontroller; 6 pin of LCD display 20 core interface P1 are connected with 8 pin of microcontroller; 7 pin of LCD display 20 core interface P1,1 pin of the first pull-up resistor RP1 are connected with 39 pin of microcontroller, and 8 pin of LCD display 20 core interface P1,2 pin of the first pull-up resistor RP1 are connected with 38 pin of microcontroller, and 9 pin of LCD display 20 core interface P1,3 pin of the first pull-up resistor RP1 are connected with 37 pin of microcontroller; 10 pin of LCD display 20 core interface P1,4 pin of the first pull-up resistor RP1 are connected with 36 pin of microcontroller; 11 pin of LCD display 20 core interface P1,5 pin of the first pull-up resistor RP1 are connected with 35 pin of microcontroller, and 12 pin of LCD display 20 core interface P1,6 pin of the first pull-up resistor RP1 are connected with 34 pin of microcontroller, and 13 pin of LCD display 20 core interface P1,7 pin of the first pull-up resistor RP1 are connected with 33 pin of microcontroller; 14 pin of LCD display 20 core interface P1,8 pin of the first pull-up resistor RP1 are connected with 32 pin of microcontroller; 19 pin of 15 pin of LCD display 20 core interface P1, LCD display 20 core interface P1, the termination power VCC of the 13 filter capacitor C13, the other end ground connection of the 13 filter capacitor C13, the 20 pin ground connection of LCD display 20 core interface P1; 0 pin of the first pull-up resistor RP1, the termination power VCC of the 11 filter capacitor C11, the other end ground connection of the 11 filter capacitor C11;

Described keystroke interface circuit comprises the first pull-up resistor R1, the second pull-up resistor R2, the 14 filter capacitor C14; The first keyswitch S1, the second keyswitch S2, the 3rd keyswitch S3; The 4th keyswitch S4, the 5th keyswitch S5, the 6th keyswitch S6; The termination power VCC of the 14 filter capacitor C14; The other end ground connection of the 14 filter capacitor C14; The termination power VCC of the first pull-up resistor R1; The end of the end of the end of the other end of the first pull-up resistor R1, the first keyswitch S1, the 3rd keyswitch S3, the 5th keyswitch S5 is connected with 4 pin of microcontroller; The end of the other end of the first keyswitch S1, the second keyswitch S2 is connected with 1 pin of microcontroller; The end of the other end of the 3rd keyswitch S3, the 4th keyswitch S4 is connected with 2 pin of microcontroller; The end of the other end of the 5th keyswitch S5, the 6th keyswitch S6 is connected with 3 pin of microcontroller, and the end of the other end of the other end of the second keyswitch S2, the 4th keyswitch S4, the other end of the 6th keyswitch S6, the second pull-up resistor R2 is connected with 5 pin of microcontroller, another termination power VCC of the second pull-up resistor R2;

Described real-time time circuit comprises clock chip U2, power supply BT1, the 15 filter capacitor C15, the 7th pull-up resistor R7, the 8th pull-up resistor R8, the 9th pull-up resistor R9, the second quartz crystal Y2; The termination power VCC of 1 pin of clock chip U2, the 9th filter capacitor C9; The other end ground connection of the 9th filter capacitor C9,2 pin of clock chip U2 are connected with the end of the second quartz crystal Y2, and 3 pin of clock chip U2 are connected with the other end of the second quartz crystal Y2; The 4 pin ground connection of clock chip U2; The end of 5 pin of clock chip U2, the 9th pull-up resistor R9 is connected with 21 pin of microcontroller, another termination power VCC of the 9th pull-up resistor R9, and the end of 6 pin of clock chip U2, the 8th pull-up resistor R8 is connected with 22 pin of microcontroller; Another termination power VCC of the 8th pull-up resistor R8; The end of 7 pin of clock chip U2, the 7th pull-up resistor R7 is connected with 23 pin of microcontroller, another termination power VCC of the 7th pull-up resistor R7, and 8 pin of clock chip U2 connect the positive pole of power supply BT1; The minus earth of power supply BT1, the model of described clock chip U2 are DS1302;

Described RS232 serial interface circuit comprises physical chip RS-232 transceiver U4, the 16 filter capacitor C16, the 17 multiplication of voltage charge pump capacitor C 17; The tenth octuple is pressed charge pump capacitor C 18; The 19 filter capacitor C19, the 20 filter capacitor C20, RS232 interface circuit 9 needle interface J2; The positive pole of the 17 multiplication of voltage charge pump capacitor C 17 is connected with 1 pin of physical chip RS-232 transceiver U4; The negative pole of the 17 multiplication of voltage charge pump capacitor C 17 is connected with 3 pin of physical chip RS-232 transceiver U4; The positive pole of the 16 filter capacitor C16 is connected with 2 pin of physical chip RS-232 transceiver U4; The negative pole of the 16 filter capacitor C16 meets power supply VCC; The tenth octuple presses the positive pole of charge pump capacitor C 18 to be connected with 4 pin of physical chip RS-232 transceiver U4, and the tenth octuple presses the negative pole of charge pump capacitor C 18 to be connected with 5 pin of physical chip RS-232 transceiver U4, and the negative pole of the 19 filter capacitor C19 is connected with 6 pin of physical chip RS-232 transceiver U4; The plus earth of the 19 filter capacitor C19; 11 pin of physical chip RS-232 transceiver U4 are connected with 11 pin of microcontroller, and 12 pin of physical chip RS-232 transceiver U4 are connected with 10 pin of microcontroller, and 13 pin of physical chip RS-232 transceiver U4 are connected with 3 pin of RS232 interface circuit nine kinds of needles interface J2; 14 pin of physical chip RS-232 transceiver U4 are connected with 2 pin of RS232 interface circuit nine kinds of needles interface J2; The 15 pin ground connection of physical chip RS-232 transceiver U4,16 pin of physical chip RS-232 transceiver U4, the termination power VCC of the 20 filter capacitor C20, the other end ground connection of the 20 filter capacitor C20; The 5 pin ground connection of RS232 interface circuit needle interface J2, the model of described physical chip RS-232 transceiver U4 is MAX232CPE.

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