CN210380874U - Signal anti-interference circuit for communication between microprocessor and serial port touch screen - Google Patents
Signal anti-interference circuit for communication between microprocessor and serial port touch screen Download PDFInfo
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- CN210380874U CN210380874U CN201921486950.4U CN201921486950U CN210380874U CN 210380874 U CN210380874 U CN 210380874U CN 201921486950 U CN201921486950 U CN 201921486950U CN 210380874 U CN210380874 U CN 210380874U
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Abstract
The utility model discloses a signal anti-jamming circuit for microprocessor and serial port touch screen communication, contain the first serial port signal processing circuit that is used for being connected with the microprocessor electricity and be used for the second serial port signal processing circuit that is connected with the serial port touch screen electricity, first serial port signal processing circuit contains parallelly connected first serial port signal input branch road and first serial port signal output branch road, second serial port signal processing circuit contains parallelly connected second serial port signal input branch road and second serial port signal output branch road; the first serial port signal input branch and the second serial port signal output branch are communicated through a first optical fiber signal line, and the first serial port signal output branch and the second serial port signal input branch are communicated through a first optical fiber signal line. The utility model has the advantages that: the problem that serial port signals between the microprocessor and the touch display screen are interfered by high-frequency signals is solved, and the accuracy of data transmission is guaranteed.
Description
Technical Field
The utility model relates to a signal anti jamming circuit, specific saying so relates to a signal anti jamming circuit that is used for microprocessor and serial ports touch screen communication.
Background
The short wave therapeutic apparatus generally uses serial communication to realize the communication between the microprocessor and the serial touch display screen so as to achieve the function of control function; however, the output signal of the traditional shortwave therapeutic apparatus is a sine wave with the frequency of 27.12MHz and the rated power of 200W due to the particularity of the output signal of the apparatus, and the signal belongs to high frequency and high power, so that the serial port communication is very susceptible to interference in the transmission process, and the transmission data is incorrect. Therefore, when the microprocessor of the short wave therapeutic apparatus is communicated with the touch display screen, the microprocessor can be interfered by the short wave signal output by the microprocessor, so that the function control is out of control.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a signal anti jamming circuit for microprocessor and serial ports touch screen communication, it mainly is to convert serial signals into light signal to solve the problem that short wave therapeutic instrument is disturbed because of the communication signal that self instrument output signal's particularity caused among the background art, make transmission data incorrect, and then cause control function out of control.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the signal anti-interference circuit for the communication between the microprocessor and the serial port touch screen comprises a first serial port signal processing circuit and a second serial port signal processing circuit, wherein the first serial port signal processing circuit is electrically connected with the microprocessor and comprises a first serial port signal input branch and a first serial port signal output branch which are connected in parallel, and the second serial port signal processing circuit comprises a second serial port signal input branch and a second serial port signal output branch which are connected in parallel;
the output end of the first serial port signal input branch is used for being connected with a serial port receiving end RX of the microprocessor, the input end of the first serial port signal input branch is connected with the output end of the second serial port signal output branch through a second optical fiber signal line, and the input end of the second serial port signal output branch is used for being connected with a serial port transmitting end TX of a serial port touch screen;
the input end of the first serial port signal output branch is used for being connected with a serial port sending end TX of the microprocessor, the output end of the first serial port signal output branch is connected with the input end of the second serial port signal input branch through a first optical fiber signal line, and the output end of the second serial port signal input branch is used for being connected with a serial port receiving end RX of a serial port touch screen;
the first serial port signal output branch is used for converting TTL level signals output by a serial port sending end TX of the microprocessor into RS-232 level signals, then converting the RS-232 level signals into optical signals, and sending the optical signals to a second serial port signal input branch of a second serial port signal processing circuit through a first optical fiber signal wire;
the second serial port signal input branch circuit is used for converting an optical signal sent by the first serial port signal output branch circuit into an RS-232 level signal, then converting the RS-232 level signal into a TTL level signal, and transmitting the TTL level signal to a serial port receiving end RX of the serial port touch screen for connection;
the second serial port signal output branch is used for converting TTL level signals output by a serial port sending end TX of the serial port touch screen into RS-232 level signals, then converting the RS-232 level signals into optical signals, and sending the optical signals to a first serial port signal input branch of the first serial port signal processing circuit through a second optical fiber signal line;
and the first serial port signal input branch is used for converting the optical signal sent by the second serial port signal output branch into an RS-232 level signal, then converting the RS-232 level signal into a TTL level signal, and transmitting the TTL level signal to a serial port receiving end RX of the microprocessor for connection.
In the above technical solution, the first serial port signal input branch includes a resistor R1, a resistor R3, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a transistor Q1, an integrated operational amplifier U1, and an optical fiber receiving head G1; the first serial port signal output branch (102) comprises a resistor R2, a resistor R4, a resistor R9, a resistor R10, a triode Q2, an integrated operational amplifier U2 and an optical fiber transmitting head G2;
the output end of the resistor R1 is used for being connected with a serial port receiving end RX of the microprocessor, the input end of the resistor R1 is connected with the output end of the resistor R3 and the collector c of the triode Q1, the input end of the resistor R3 is connected with the input end of the resistor R4 and connected with a direct current power supply M +5V, the output end of the resistor R4 is connected with the collector c of the triode Q2 and connected with the pin 5 of the main board jumper J1, the input end of the resistor R2 is used for being connected with a serial port transmitting end TX of the microprocessor, the output end of the resistor R2 is connected with the base b of the triode Q2, the base b of the triode Q1 is connected with the pin 4 of the main board jumper J1, and the emitter e of the triode Q1 is connected with;
In the above technical solution, the second serial port signal input branch includes a resistor R11, a resistor R12, a resistor R13, a resistor R14, a triode Q3, an integrated operational amplifier U3, a capacitor C1, and an optical fiber receiving terminal G3; the second serial port signal output branch comprises a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a triode Q4, an integrated operational amplifier U4 and an optical fiber transmitting head G4;
the receiving port 4 of the optical fiber receiving head G3 is correspondingly connected with the transmitting port 4 of the optical fiber transmitting head G2 through a first optical fiber signal line, a pin 1 of the optical fiber receiving head G3 is connected with the input end of the resistor R13 and is connected with a direct current power supply +5V, a pin 2 of the optical fiber receiving head G3 is connected with the output end of the resistor R13 and is connected with a pin 3 of the integrated operational amplifier U3, and the pin 3 of the optical fiber receiving head G3 is grounded after passing through the resistor R14;
the transmitting port 4 of the optical fiber transmitting head G4 is connected with the receiving port 4 of the optical fiber receiving head G1 through a second optical fiber signal wire, a pin 3 of the optical fiber transmitting head G4 is connected to a pin 1 of the integrated operational amplifier U4 after passing through a resistor R16, a pin 2 of the optical fiber transmitting head G4 is connected to a direct-current power supply +5V after passing through a resistor R17, and the pin 1 of the optical fiber transmitting head G4 is grounded;
wherein, the pin 1 of the integrated operational amplifier U3 is connected to the base b of the triode Q3 through the resistor R11, the pin 2 of the integrated operational amplifier U3 is connected in parallel with the input end of the capacitor C1, the pin 2 of the integrated operational amplifier U4 and the output end of the resistor R18 and then is grounded through the resistor R19, the pin 5 of the integrated operational amplifier U3, the input end of the resistor R18, the collector C of the triode Q3 and the collector C of the triode Q4 are respectively connected to a direct-current power supply +5V, the pin 4 of the integrated operational amplifier U3 and the output end of the capacitor C1 are respectively grounded, the pin 3 of the integrated operational amplifier U4 is connected with the emitter e of the triode Q4 in parallel and then grounded through the resistor R15, the base b of the triode Q4 is correspondingly connected with the serial port receiving end RX of the serial port touch screen, the emitter e of the triode Q3 is correspondingly connected with the input end of the resistor R12 and the serial port transmitting end TX of the serial port touch screen, and the output end of the resistor R12 is grounded.
In the above technical solution, the triode Q1, the triode Q2, the triode Q3 and the triode Q4 are all NPN-type triodes 8550.
In the above technical solution, the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8, the resistor R9, the resistor R10, the resistor R11, the resistor R12, the resistor R13, the resistor R14, the resistor R15, the resistor R16, the resistor R17, the resistor R18 and the resistor R19 are all 805 chip resistors, and R1, R2, and R9 are all chip resistors with a surface labeled as 100, R3, R4, R12, and R15 are all chip resistors with a surface labeled as 2K, R5 and R19 are all chip resistors with a surface labeled as 1.2K, R6 and R18 are all chip resistors with a surface labeled as 1.5K, R7 and R13 are all chip resistors with a surface labeled as 10K, R8, R10, R14, and R17 are all chip resistors with a surface labeled as 430, and R11 and R16 are all chip resistors with a surface labeled as 101.
In the above technical solution, the capacitor C1 is a chip resistor with a surface labeled as 104.
In the above solution, the fiber receiving head G1 and the fiber receiving head G3 are both HKRX178A fiber receivers.
In the above technical solution, the optical fiber emitting head G2 and the optical fiber emitting head G4 are both DLT1111 optical fiber emitters.
In the above technical solution, the integrated operational amplifier U2, the integrated operational amplifier U3, and the integrated operational amplifier U4 are all LM358 dual operational amplifiers.
Compared with the prior art, the utility model discloses an advantage and beneficial effect are: convert prior art's serial ports transmission signal into light signal transmission, can effectively solve the transmission in-process, the serial ports signal between microprocessor and the touch-control display screen is by the problem of high frequency signal interference, can effectively guarantee shortwave therapeutic instrument data transmission's accuracy when using serial ports communication to realize the communication between microprocessor and the serial ports touch-control display screen.
Drawings
FIG. 1 is a simplified block diagram of the present invention;
FIG. 2 is a circuit embodiment of a first serial port signal processing circuit;
FIG. 3 shows an embodiment of a second serial signal processing circuit;
description of reference numerals:
1. a microprocessor; 2. a serial port touch screen;
100. a first serial port signal processing circuit; 101. a first serial port signal input branch; 102. a first serial port signal output branch;
200. a second serial port signal processing circuit; 201. a second serial port signal input branch; 202. and the second serial port signal output branch.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, how to implement the present invention is further explained below with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, the utility model provides a signal anti jamming circuit for microprocessor and serial ports touch screen communication, contain the first serial ports signal processing circuit 100 that is used for being connected with microprocessor 1 electricity and be used for the second serial ports signal processing circuit 200 of being connected with serial ports touch screen 2 electricity, first serial ports signal processing circuit 100 contains parallelly connected first serial ports signal input branch 101 and first serial ports signal output branch 102, second serial ports signal processing circuit 200 contains parallelly connected second serial ports signal input branch 201 and second serial ports signal output branch 202, wherein: the output end of the first serial port signal input branch 101 is used for being connected with a serial port receiving end RX of the microprocessor 1, the input end of the first serial port signal input branch 101 is connected with the output end of the second serial port signal output branch 202 through a second optical fiber signal line 400, and the input end of the second serial port signal output branch 202 is used for being connected with a serial port transmitting end TX of the serial port touch screen 2; the input end of the first serial port signal output branch 102 is used for being connected with a serial port transmitting end TX of the microprocessor 1, the output end of the first serial port signal output branch 102 is connected with the input end of a second serial port signal input branch 201 through a first optical fiber signal line 300, and the output end of the second serial port signal input branch 201 is used for being connected with a serial port receiving end RX of the serial port touch screen 2; the first serial port signal output branch 102 is configured to convert a TTL level signal output by a serial port transmitting end TX of the microprocessor 1 into an RS-232 level signal, convert the RS-232 level signal into an optical signal, and send the optical signal to a second serial port signal input branch 201 of the second serial port signal processing circuit 200 through a first optical fiber signal line 300; the second serial port signal input branch 201 is used for converting the optical signal sent by the first serial port signal output branch 102 into an RS-232 level signal, then converting the RS-232 level signal into a TTL level signal, and transmitting the TTL level signal to a serial port receiving end RX of the serial port touch screen 2 for connection; the second serial port signal output branch 202 is configured to convert a TTL level signal output by a serial port transmitting end TX of the serial port touch screen 2 into an RS-232 level signal, convert the RS-232 level signal into an optical signal, and send the optical signal to the first serial port signal input branch 101 of the first serial port signal processing circuit 100 through the second optical fiber signal line 400; the first serial signal input branch 101 is configured to convert the optical signal sent by the second serial signal output branch 202 into an RS-232 level signal, convert the RS-232 level signal into a TTL level signal, and transmit the TTL level signal to a serial receiving end RX of the microprocessor 1 for connection.
As a preferred embodiment of the present invention: as shown in fig. 2, the first serial port signal input branch 101 includes a resistor R1, a resistor R3, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a transistor Q1, an integrated operational amplifier U1, and a fiber receiving head G1; the first serial port signal output branch 102 comprises a resistor R2, a resistor R4, a resistor R9, a resistor R10, a triode Q2, an integrated operational amplifier U2 and an optical fiber emitter G2; the output end of the resistor R1 is used for being connected with a serial port receiving end RX of the microprocessor 1, the input end of the resistor R1 is connected with the output end of the resistor R3 and the collector c of the triode Q1, the input end of the resistor R3 is connected with the input end of the resistor R4 and connected with a direct current power supply M +5V, the output end of the resistor R4 is connected with the collector c of the triode Q2 and connected with the pin 5 of the main board jumper J1, the input end of the resistor R2 is used for being connected with a serial port transmitting end TX of the microprocessor 1, the output end of the resistor R2 is connected with the base b of the triode Q2, the base b of the triode Q1 is connected with the pin 4 of the main board jumper J1, and the emitter e of the triode Q1 is connected with; pin 1 of the integrated operational amplifier U1 is correspondingly connected with pin 4 of the motherboard jumper J1, pin 2 of the integrated operational amplifier U1 is connected with pin 2 of the integrated operational amplifier U2 and the output end of the resistor R6 in parallel and then connected to the input end of the resistor R5, the output end of the resistor R5 is connected with pin 4 of the integrated operational amplifier U1 in parallel and then connected to the ground, and the input end of the resistor R6 and pin 5 of the integrated operational amplifier U1 are connected to the direct-current power supply M +5V in parallel; pin 3 of the integrated operational amplifier U2 is correspondingly connected with pin 5 of the motherboard jumper J1, pin 1 of the integrated operational amplifier U2 is connected to pin 3 of the optical fiber emitter G2 after passing through the resistor R9, pin 2 of the optical fiber emitter G2 is correspondingly connected with the output end of the resistor R10, pin 1 of the optical fiber emitter G2 is connected in parallel with pin 3 of the optical fiber receiver G1 and then grounded together, pin 2 of the optical fiber receiver G1 is connected with the output end of the resistor R7 and connected with pin 3 of the integrated operational amplifier U1, pin 1 of the optical fiber receiver G1 is connected with the output end of the resistor R8 and connected with the input end of the resistor R7, and the input end of the resistor R8 is connected with the input end of the resistor R10 and connected with the dc power supply M + 5V.
As shown in fig. 3, the second serial signal input branch 201 includes a resistor R11, a resistor R12, a resistor R13, a resistor R14, a transistor Q3, an integrated operational amplifier U3, a capacitor C1, and an optical fiber receiving terminal G3; the second serial signal output branch 202 comprises a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a triode Q4, an integrated operational amplifier U4 and an optical fiber transmitting head G4; the receiving port 4 of the optical fiber receiving head G3 is correspondingly connected with the transmitting port 4 of the optical fiber transmitting head G2 through a first optical fiber signal line 300, a pin 1 of the optical fiber receiving head G3 is connected with the input end of the resistor R13 and is connected with a direct current power supply +5V, a pin 2 of the optical fiber receiving head G3 is connected with the output end of the resistor R13 and is connected with a pin 3 of the integrated operational amplifier U3, and the pin 3 of the optical fiber receiving head G3 is grounded after passing through the resistor R14; a transmitting port 4 of the optical fiber transmitting head G4 is connected with a receiving port 4 of the optical fiber receiving head G1 through a second optical fiber signal wire 400, a pin 3 of the optical fiber transmitting head G4 is connected to a pin 1 of the integrated operational amplifier U4 after passing through a resistor R16, a pin 2 of the optical fiber transmitting head G4 is connected to a direct-current power supply +5V after passing through a resistor R17, and the pin 1 of the optical fiber transmitting head G4 is grounded; pin 1 of the integrated operational amplifier U3 is connected to the base b of the triode Q3 through the resistor R11, pin 2 of the integrated operational amplifier U3 is connected in parallel with the input terminal of the capacitor C1, pin 2 of the integrated operational amplifier U4 and the output terminal of the resistor R18, and then is grounded through the resistor R19, pin 5 of the integrated operational amplifier U3, the input end of the resistor R18, the collector C of the triode Q3 and the collector C of the triode Q4 are respectively connected to a direct-current power supply +5V, the pin 4 of the integrated operational amplifier U3 and the output end of the capacitor C1 are respectively grounded, the pin 3 of the integrated operational amplifier U4 is connected with the emitter e of the triode Q4 in parallel and then grounded through the resistor R15, the base b of the triode Q4 is correspondingly connected with the serial port receiving end RX of the serial port touch screen 2, the emitter e of the triode Q3 is correspondingly connected with the input end of the resistor R12 and the serial port transmitting end TX of the serial port touch screen 2, and the output end of the resistor R12 is grounded.
Specifically, in the preferred embodiment, the transistor Q1, the transistor Q2, the transistor Q3, and the transistor Q4 are all NPN transistors 8550.
Specifically, in the preferred embodiment, the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8, the resistor R9, the resistor R10, the resistor R11, the resistor R12, the resistor R13, the resistor R14, the resistor R15, the resistor R16, the resistor R17, the resistor R18, and the resistor R19 are all 805 package chip resistors; and wherein, R1, R2 and R9 are all chip resistors with a surface labeled as 100, R3, R4, R12 and R15 are all chip resistors with a surface labeled as 2K, R5 and R19 are all chip resistors with a surface labeled as 1.2K, R6 and R18 are all chip resistors with a surface labeled as 1.5K, R7 and R13 are all chip resistors with a surface labeled as 10K, R8, R10, R14 and R17 are all chip resistors with a surface labeled as 430, and R11 and R16 are all chip resistors with a surface labeled as 101.
Specifically, in the preferred embodiment, capacitor C1 is a patch capacitor having a surface designated 104.
Specifically, in the preferred embodiment, the fiber-receiving head G1 and the fiber-receiving head G3 are both HKRX178A fiber-optic receivers; the fiber launch head G2 and the fiber launch head G4 are both DLT1111 fiber launch devices.
Specifically, in the preferred embodiment, the integrated operational amplifier U2, the integrated operational amplifier U3, and the integrated operational amplifier U4 are all LM358 dual operational amplifiers.
The triode Q1 and the triode Q3 are used for converting the RS-232 level serial port signal into a TTL level serial port signal; the triode Q2 and the triode Q4 are used for converting TTL level serial port signals into RS-232 level serial port signals; the optical fiber receiving head G1 and the optical fiber receiving head G3 are used for receiving optical signals and converting the optical signals into RS-232 level signals; the optical fiber transmitting head G2 and the optical fiber transmitting head G4 are used for converting the RS-232 level signals into optical signals; the resistors R1 to R19 are used for voltage division or shunt.
Finally, the above description is only the embodiments of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (9)
1. A signal anti jamming circuit for microprocessor and serial ports touch screen communication, its characterized in that: the device comprises a first serial port signal processing circuit (100) electrically connected with a microprocessor (1) and a second serial port signal processing circuit (200) electrically connected with a serial port touch screen (2), wherein the first serial port signal processing circuit (100) comprises a first serial port signal input branch (101) and a first serial port signal output branch (102) which are connected in parallel, and the second serial port signal processing circuit (200) comprises a second serial port signal input branch (201) and a second serial port signal output branch (202) which are connected in parallel;
the output end of the first serial port signal input branch (101) is used for being connected with a serial port receiving end RX of the microprocessor (1), the input end of the first serial port signal input branch (101) is connected with the output end of the second serial port signal output branch (202) through a second optical fiber signal line (400), and the input end of the second serial port signal output branch (202) is used for being connected with a serial port transmitting end TX of a serial port touch screen (2);
the input end of the first serial port signal output branch (102) is used for being connected with a serial port transmitting end TX of the microprocessor (1), the output end of the first serial port signal output branch (102) is connected with the input end of the second serial port signal input branch (201) through a first optical fiber signal line (300), and the output end of the second serial port signal input branch (201) is used for being connected with a serial port receiving end RX of a serial port touch screen (2);
the first serial port signal output branch (102) is used for converting TTL level signals output by a serial port sending end TX of the microprocessor (1) into RS-232 level signals, then converting the RS-232 level signals into optical signals, and sending the optical signals to a second serial port signal input branch (201) of the second serial port signal processing circuit (200) through a first optical fiber signal line (300);
the second serial port signal input branch circuit (201) is used for converting an optical signal sent by the first serial port signal output branch circuit (102) into an RS-232 level signal, then converting the RS-232 level signal into a TTL level signal, and transmitting the TTL level signal to a serial port receiving end RX of the serial port touch screen (2) for connection;
the second serial port signal output branch (202) is used for converting TTL level signals output by a serial port sending end TX of the serial port touch screen (2) into RS-232 level signals, then converting the RS-232 level signals into optical signals, and sending the optical signals to a first serial port signal input branch (101) of the first serial port signal processing circuit (100) through a second optical fiber signal line (400);
the first serial port signal input branch circuit (101) is used for converting an optical signal sent by the second serial port signal output branch circuit (202) into an RS-232 level signal, then converting the RS-232 level signal into a TTL level signal, and transmitting the TTL level signal to a serial port receiving end RX of the microprocessor (1) for connection.
2. The signal anti-interference circuit for the communication between the microprocessor and the serial touch screen according to claim 1, wherein: the first serial port signal input branch (101) comprises a resistor R1, a resistor R3, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a triode Q1, an integrated operational amplifier U1 and an optical fiber receiving head G1; the first serial port signal output branch (102) comprises a resistor R2, a resistor R4, a resistor R9, a resistor R10, a triode Q2, an integrated operational amplifier U2 and an optical fiber transmitting head G2;
the output end of the resistor R1 is used for being connected with a serial port receiving end RX of the microprocessor (1), the input end of the resistor R1 is connected with the output end of the resistor R3 and a collector c of the triode Q1, the input end of the resistor R3 is connected with the input end of the resistor R4 and connected with a direct-current power supply M +5V, the output end of the resistor R4 is connected with a collector c of the triode Q2 and connected with a pin 5 of a main board jumper J1, the input end of the resistor R2 is used for being connected with a serial port transmitting end TX of the microprocessor (1), the output end of the resistor R2 is connected with a base b of the triode Q2, a base b of the triode Q1 is connected with a pin 4 of the main board jumper J1, and an emitter e of the triode Q1 is connected with an;
pin 1 of the integrated operational amplifier U1 is correspondingly connected with pin 4 of the motherboard jumper J1, pin 2 of the integrated operational amplifier U1 is connected in parallel with pin 2 of the integrated operational amplifier U2 and the output end of the resistor R6 and then connected to the input end of the resistor R5, the output end of the resistor R5 is connected in parallel with pin 4 of the integrated operational amplifier U1 and then grounded together, and the input end of the resistor R6 and pin 5 of the integrated operational amplifier U1 are connected to the dc power supply M + 5V;
pin 3 of the integrated operational amplifier U2 is correspondingly connected to pin 5 of the motherboard jumper J1, pin 1 of the integrated operational amplifier U2 passes through the resistor R9 and then is connected to pin 3 of the optical fiber transmitter G2, pin 2 of the optical fiber transmitter G2 is correspondingly connected to the output terminal of the resistor R10, pin 1 of the optical fiber transmitter G2 and pin 3 of the optical fiber receiver G1 are connected in parallel and then are grounded together, pin 2 of the optical fiber receiver G1 and the output terminal of the resistor R7 are connected to pin 3 of the integrated operational amplifier U1, pin 1 of the optical fiber receiver G1 and the output terminal of the resistor R8 are connected to the input terminal of the resistor R7, and the input terminal of the resistor R8 and the input terminal of the resistor R10 are connected to the dc power supply M + 5V.
3. The signal anti-interference circuit for the communication between the microprocessor and the serial touch screen according to claim 2, wherein: the second serial port signal input branch (201) comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a triode Q3, an integrated operational amplifier U3, a capacitor C1 and an optical fiber receiving head G3; the second serial port signal output branch (202) comprises a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a triode Q4, an integrated operational amplifier U4 and an optical fiber transmitting head G4;
the receiving port 4 of the optical fiber receiving head G3 is correspondingly connected with the transmitting port 4 of the optical fiber transmitting head G2 through a first optical fiber signal wire (300), a pin 1 of the optical fiber receiving head G3 is connected with the input end of a resistor R13 and is connected with a direct current power supply +5V, a pin 2 of the optical fiber receiving head G3 is connected with the output end of a resistor R13 and is connected with a pin 3 of an integrated operational amplifier U3, and the pin 3 of the optical fiber receiving head G3 is grounded after passing through the resistor R14;
the transmitting port 4 of the optical fiber transmitting head G4 is connected with the receiving port 4 of the optical fiber receiving head G1 through a second optical fiber signal wire (400), a pin 3 of the optical fiber transmitting head G4 is connected to a pin 1 of the integrated operational amplifier U4 after passing through a resistor R16, a pin 2 of the optical fiber transmitting head G4 is connected to a direct-current power supply +5V after passing through a resistor R17, and the pin 1 of the optical fiber transmitting head G4 is grounded;
wherein, a pin 1 of the integrated operational amplifier U3 is connected to a base b of a triode Q3 through a resistor R11, a pin 2 of the integrated operational amplifier U3 is connected in parallel with an input end of a capacitor C1, a pin 2 of the integrated operational amplifier U4 and an output end of a resistor R18 and then grounded through a resistor R19, a pin 5 of the integrated operational amplifier U3, an input end of a resistor R18, a collector C of the triode Q3 and a collector C of the triode Q4 are respectively connected to a direct current power supply +5V, a pin 4 of the integrated operational amplifier U3 and an output end of the capacitor C1 are respectively grounded, a pin 3 of the integrated operational amplifier U4 is connected in parallel with an emitter e of a triode Q4 and then grounded through a resistor R15, the base b of the triode Q4 is correspondingly connected with a serial port receiving end RX of a touch screen (2), and an emitter e of the triode Q3 is correspondingly connected with an input end of a resistor R12 and a, the output terminal of the resistor R12 is connected to ground.
4. The signal anti-interference circuit for the communication between the microprocessor and the serial touch screen according to claim 3, wherein: the triode Q1, the triode Q2, the triode Q3 and the triode Q4 are all NPN type triodes 8550.
5. The signal anti-interference circuit for the communication between the microprocessor and the serial touch screen according to claim 3, wherein: the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8, the resistor R9, the resistor R10, the resistor R11, the resistor R12, the resistor R13, the resistor R14, the resistor R15, the resistor R16, the resistor R17, the resistor R18, and the resistor R19 are all 805 package chip resistors, the resistors R1, R2, and R9 are all chip resistors with a surface labeled as 100, the resistors R3, R4, and R4 are all chip resistors with a surface labeled as 2K, the resistors R4 and R4 are all chip resistors with a surface labeled as 1.2K, the resistors R4, and R4 are all chip resistors with a surface labeled as 10K, the resistors R4, and R36430 are all chip resistors with a surface labeled as surface resistors.
6. The signal anti-interference circuit for the communication between the microprocessor and the serial touch screen according to claim 3, wherein: the capacitance C1 is a patch resistance with a surface labeled 104.
7. The signal anti-interference circuit for the communication between the microprocessor and the serial touch screen according to claim 3, wherein: the fiber receiving head G1 and the fiber receiving head G3 are both HKRX178A fiber receivers.
8. The signal anti-interference circuit for the communication between the microprocessor and the serial touch screen according to claim 3, wherein: the optical fiber transmitting head G2 and the optical fiber transmitting head G4 are DLT1111 optical fiber transmitters.
9. The signal anti-interference circuit for the communication between the microprocessor and the serial touch screen according to claim 3, wherein: the integrated operational amplifier U, the integrated operational amplifier U2, the integrated operational amplifier U3, and the integrated operational amplifier U4 are LM358 dual operational amplifiers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921486950.4U CN210380874U (en) | 2019-09-09 | 2019-09-09 | Signal anti-interference circuit for communication between microprocessor and serial port touch screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921486950.4U CN210380874U (en) | 2019-09-09 | 2019-09-09 | Signal anti-interference circuit for communication between microprocessor and serial port touch screen |
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| Publication Number | Publication Date |
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| CN210380874U true CN210380874U (en) | 2020-04-21 |
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| CN201921486950.4U Active CN210380874U (en) | 2019-09-09 | 2019-09-09 | Signal anti-interference circuit for communication between microprocessor and serial port touch screen |
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| Country | Link |
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| CN (1) | CN210380874U (en) |
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