Optometry system

Abstract

The utility model discloses an optometry system. The optometry system comprises first equipment and second equipment, the first equipment is provided with a first main control chip for sending a first electric signal to the first receiving and transmitting device and receiving a second electric signal transmitted by the first receiving and transmitting device; and the first transceiving device is connected with the first main control chip, converts the first electric signal into a first optical signal, radiates the first optical signal, receives a second optical signal and converts the second optical signal into a second electric signal. The second equipment is provided with a second main control chip for sending a second electric signal to the second transceiving device and receiving a first electric signal transmitted by the second transceiving device; and the second transceiving device is connected with the second main control chip, converts the second electric signal into a second optical signal, radiates and receives the first optical signal, and converts the first optical signal into a first electric signal, wherein the first electric signal and the second electric signal respectively carry message data. The optometry system can improve the reliability of communication between devices.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to an optometry system. Background Art

[0002] At present, the existing optometry system adopts wireless communication methods, such as forming a local area network through Bluetooth or WIFI communication methods. This type of wireless communication method uses radio waves in the corresponding frequency band to form a network and transmit data between two devices of the optometry system in the local area network.

[0003] However, in actual application scenarios, the network environment is relatively complex. For example, in an office environment with many WIFI routers or Bluetooth terminals, the communication channels of WIFI or Bluetooth are easily squeezed out and the network is disconnected, resulting in poor reliability. If some devices in the optometry system are not synchronized, it will cause problems such as chaotic control logic, which will affect the measurement results. In addition, the optometry system is highly complex, difficult to troubleshoot, cumbersome to connect, and costly. Utility Model Content

[0004] The utility model aims to provide an optometry system, which can improve the reliability of communication between devices in the optometry system.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An optometry system includes a first device and a second device;

[0007] The first device is provided with:

[0008] A first main control chip that sends a first electrical signal to a first transceiver device and receives a second electrical signal transmitted by the first transceiver device;

[0009] The first transceiver device is connected to the first main control chip, converts the first electrical signal into a first optical signal and radiates the first optical signal, and receives the second optical signal radiated by the second transceiver device and converts the second optical signal into the second electrical signal;

[0010] The second device is provided with:

[0011] A second main control chip that sends the second electrical signal to the second transceiver device and receives the first electrical signal transmitted by the second transceiver device;

[0012] The second transceiver device is connected to the second main control chip, converts the second electrical signal into the second optical signal and radiates the second optical signal, and receives the first optical signal radiated by the first transceiver device and converts the first optical signal into the first electrical signal, wherein the first electrical signal and the second electrical signal respectively carry message data.

[0013] Optionally, the first transceiver device / the second transceiver device comprises a communication tube, a first signal input end and a signal output end, the communication tube comprises a first light-emitting tube and a receiver, and the first signal input end and the signal output end are respectively connected to the first main control chip / the second main control chip;

[0014] The first light emitting diode is used for converting the first electrical signal / the second electrical signal inputted by the first main control chip / the second main control chip through the first signal input terminal into the first optical signal / the second optical signal and radiating the first optical signal / the second optical signal;

[0015] The receiver is used to receive the first optical signal / the second optical signal and convert the first optical signal / the second optical signal into the first electrical signal / the second electrical signal, and transmit the first electrical signal / the second electrical signal to the second main control chip / the first main control chip through the signal output end.

[0016] Optionally, the communication tube also includes a voltage pin, a first branch led out from the voltage pin is connected to a voltage source, the first branch is connected in series with a first inductor, a second branch led out from the voltage pin is grounded, the second branch is connected in series with a first capacitor, and a third branch led out from the voltage pin is connected to a power supply end.

[0017] Optionally, the communication tube further includes a positive electrode pin, and the positive electrode pin is connected to the positive electrode of the first light-emitting tube.

[0018] Optionally, a second resistor is connected between the first signal input end and the communication tube, and a third resistor is connected between the signal output end and the communication tube.

[0019] Optionally, the first device is further provided with:

[0020] a first transmitting device connected to the first main control chip, which converts the first electrical signal into the first optical signal and radiates the first optical signal, wherein the second transceiver is further used to receive the first optical signal radiated by the first transmitting device and convert the first optical signal into the first electrical signal;

[0021] Or / and, the second device is further provided with:

[0022] A second transmitting device connected to the second main control chip, converting the second electrical signal into the second optical signal and radiating the second optical signal, wherein the first transceiver is also used to receive the second optical signal radiated by the second transmitting device and convert the second optical signal into the second electrical signal.

[0023] Optionally, the first emitting device / the second emitting device includes a field effect tube and a second light-emitting tube, one end of the second light-emitting tube is connected to a voltage source, and the other end is connected to the drain of the field effect tube, the gate of the field effect tube is connected to the second signal input terminal, and the source is grounded, and the second signal input terminal is used to connect to the first main control chip / the second main control chip.

[0024] Optionally, a fifth resistor is connected between the gate of the field effect tube and the second signal input terminal, a sixth resistor is connected to the source of the field effect tube, and a seventh resistor is connected between the second light-emitting tube and the voltage source.

[0025] Optionally, the first main control chip / the second main control chip is provided with a serial port, and the first main control chip / the second main control chip is connected to the first transceiver device / the second transceiver device through the serial port.

[0026] Optionally, the optical signal comprises an infrared light signal.

[0027] It can be seen from the above technical solution that the optometry system provided by the utility model includes a first device and a second device. The first device is provided with: a first main control chip that sends a first electrical signal to a first transceiver device and receives a second electrical signal transmitted by the first transceiver device; a first transceiver device connected to the first main control chip, converting the first electrical signal into a first optical signal and radiating the first optical signal, and receiving the second optical signal radiated by the second transceiver device and converting the second optical signal into a second electrical signal. The second device is provided with: a second main control chip that sends a second electrical signal to a second transceiver device and receives the first electrical signal transmitted by the second transceiver device; a second transceiver device connected to the second main control chip, converting the second electrical signal into a second optical signal and radiating the second optical signal, and receiving the first optical signal radiated by the first transceiver device and converting the first optical signal into a first electrical signal, wherein the first electrical signal and the second electrical signal respectively carry message data. Then, optical communication can be performed between the first device and the second device of the optometry system to transmit data. Compared with the existing method of communicating between two devices of the optometry system through networking with radio waves of a certain frequency band, the problem of communication channels being easily squeezed out and disconnected from the network and poor communication reliability can be avoided. Therefore, the optometry system of the utility model can improve the reliability of communication between the devices of the optometry system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of an optometry system provided in one embodiment of the utility model;

[0030] Figure 2 A circuit diagram of a first transceiver device / a second transceiver device of an optometry system according to an embodiment of the utility model;

[0031] Figure 3 This is a circuit diagram of a first emitting device / a second emitting device of an optometry system according to an embodiment of the present invention.

[0032] The reference numerals in the drawings of the specification include:

[0033] 11-first device, 12-second device, 110-first main control chip, 111-first transceiver, 112-first transmitter, 120-second main control chip, 121-second transceiver, 122-second transmitter, 113-first window, 114-second window. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] This embodiment provides an optometry system, including a first device and a second device;

[0036] The first device is provided with:

[0037] A first main control chip that sends a first electrical signal to a first transceiver device and receives a second electrical signal transmitted by the first transceiver device;

[0038] The first transceiver device is connected to the first main control chip, converts the first electrical signal into a first optical signal and radiates the first optical signal, and receives the second optical signal radiated by the second transceiver device and converts the second optical signal into the second electrical signal;

[0039] The second device is provided with:

[0040] A second main control chip that sends the second electrical signal to the second transceiver device and receives the first electrical signal transmitted by the second transceiver device;

[0041] The second transceiver device is connected to the second main control chip, converts the second electrical signal into the second optical signal and radiates the second optical signal, and receives the first optical signal radiated by the first transceiver device and converts the first optical signal into the first electrical signal, wherein the first electrical signal and the second electrical signal respectively carry message data.

[0042] The first master control chip can send a first electrical signal carrying message data to the first transceiver device, and the first transceiver device converts the first electrical signal into a first optical signal and radiates the first optical signal. The second transceiver device receives the first optical signal radiated by the first transceiver device and converts the first optical signal into a first electrical signal, and transmits the first electrical signal to the second master control chip.

[0043] The second main control chip can send a second electrical signal carrying message data to the second transceiver device, and the second transceiver device converts the second electrical signal into a second optical signal and radiates the second optical signal. When the first transceiver device receives the second optical signal radiated by the second transceiver device, it converts the second optical signal into a second electrical signal and transmits the second electrical signal to the first main control chip.

[0044] The first device and the second device of the optometry system of this embodiment can perform optical communication and transmit data. Compared with the existing method of communicating between two devices of the optometry system through networking with radio waves of a certain frequency band, the problem of communication channels being easily squeezed out and disconnected from the network and poor communication reliability can be avoided. The optometry system of this embodiment can improve the reliability of communication between the devices of the optometry system.

[0045] For example, reference may be made to Figure 1 , Figure 1 This is a schematic diagram of an optometry system provided in an embodiment. As shown in the figure, the first device 11 includes a first main control chip 110 and a first transceiver 111 , and the second device 12 includes a second main control chip 120 and a second transceiver 121 .

[0046] In some embodiments, the first transceiver device 111 / the second transceiver device 121 may include a communication tube, a first signal input end and a signal output end, the communication tube includes a first light-emitting tube and a receiver, the first signal input end and the signal output end are respectively connected to the first main control chip 110 / the second main control chip 120; the first light-emitting tube is used to convert the first electrical signal / the second electrical signal input by the first main control chip 110 / the second main control chip 120 through the first signal input end into the first optical signal / the second optical signal and radiate the first optical signal / the second optical signal; the receiver is used to receive the first optical signal / the second optical signal and convert the first optical signal / the second optical signal into the first electrical signal / the second electrical signal, and transmit the first electrical signal / the second electrical signal to the second main control chip 110 / the first main control chip 120 through the signal output end.

[0047] The communication tube in this embodiment can be considered as a transceiver tube, which integrates the functions of transmitting light signals and receiving light signals. Among them, the first light-emitting tube and the receiver can be set separately, or the first light-emitting tube and the receiver can also be integrated on the communication tube, so the communication tube can be considered as a transceiver tube with integrated transmission and reception. The first light-emitting tube can also be called a transmitting tube.

[0048] In some embodiments, the communication tube may further include a voltage pin, a first branch led by the voltage pin is connected to a voltage source, a first inductor is connected in series to the first branch, a second branch led by the voltage pin is grounded, a first capacitor is connected in series to the second branch, and a third branch led by the voltage pin is connected to a power supply terminal. The first inductor and the first capacitor are used for power supply energy storage filtering. The power supply terminal is used to connect to a power supply network.

[0049] The communication tube may further include a positive pin, which is connected to the positive electrode of the first light-emitting tube. The communication tube may also include a ground pin for grounding. In some embodiments, a first resistor is connected to the ground pin, and a fourth resistor is connected to the positive pin. In some embodiments, a second resistor is connected between the first signal input terminal and the communication tube, and a third resistor is connected between the signal output terminal and the communication tube. The second resistor and the third resistor are current limiting resistors to prevent port surge damage. In practical applications, the first signal input terminal and the signal output terminal are respectively connected to the serial port of the main control chip, and the second resistor and the third resistor are serial port current limiting resistors.

[0050] For example, reference may be made to Figure 2 , Figure 2The present invention is a circuit diagram of the first transceiver device / second transceiver device of an optometry system according to an embodiment. As shown in the figure, the communication tube U2 has a first light-emitting tube and a receiver built therein, and a first window 113 and a second window 114 are provided on the communication tube U2. The first window 113 is provided corresponding to the first light-emitting tube, so that the light signal emitted by the first light-emitting tube is radiated through the first window 113. The second window 114 is provided corresponding to the receiver, so that the light signal transmitted from the outside is received by the receiver after passing through the second window 114.

[0051] The first signal input terminal TXD is led out by the TXD pin of the communication tube U2, and is used to be connected to the first main control chip 110 / the second main control chip 120. The first signal input terminal TXD is connected to the second resistor R2, and the signal output terminal RXD is led out by the RXD pin of the communication tube U2, and is used to be connected to the first main control chip 110 / the second main control chip 120. A third resistor R3 is connected to the signal output terminal RXD. The voltage pin VCC of the communication tube U2 is connected to the power supply terminal, i.e., the ZHX_VDD terminal, and the first branch led out by the voltage pin VCC of the communication tube U2 is connected to the voltage source, the first branch is connected in series with the first inductor L1, the second branch led out by the voltage pin VCC of the communication tube U2 is grounded, the second branch is connected in series with the first capacitor C1, the ground pin GND and the SHIELD pin of the communication tube U2 are grounded, and the first resistor R1 is connected to the grounding line. The positive pin of the communication tube U2, i.e., the LEDA pin, is connected to the voltage source. The LEDA pin is the positive pole of the first light-emitting tube of the communication tube U2, and a fourth resistor R4 is connected between the LEDA pin of the communication tube U2 and the voltage source. The fourth resistor R4 is a current-limiting resistor of the first light-emitting tube, and is used to set the working current of the first light-emitting tube. The SHIELD pin is used for the shielding grounding of the shell of the communication tube U2. The ZHX_VDD terminal can be connected to a 3.3V power supply network.

[0052] In a specific example, the specification of the communication tube U2 is U-ZHX1010, the specification of the first inductor L1 is BLM18SG700TN1, the specification of the first capacitor C1 is 4.7μF / 25V, the first resistor R1 is 0R / 5%, the second resistor R2 is 100R / 1%, the third resistor R3 is 100R / 1%, and the fourth resistor R4 is 1R / 1%. The voltage source is D3.3V. The first light-emitting tube is a medium-power LED, and the receiver can be a receiving decoding chip (wafer).

[0053] In some embodiments, the first device 11 is further provided with: a first transmitting device 112 connected to the first main control chip 110, which converts the first electrical signal into the first optical signal and radiates the first optical signal, and the second transceiver 121 is further used to receive the first optical signal radiated by the first transmitting device 112 and convert the first optical signal into the first electrical signal. By providing the first transmitting device 112, the first device 11 makes the radiation intensity of the optical signal radiated by the first device 11 greater than that radiated by the first transceiver 111 alone, so that the distance of communication through the optical signal is longer.

[0054] Or / and, the second device 12 is further provided with: a second transmitting device 122 connected to the second main control chip 120, which converts the second electrical signal into the second optical signal and radiates the second optical signal, and the first transceiver 111 is also used to receive the second optical signal radiated by the second transmitting device 122 and convert the second optical signal into the second electrical signal. By providing the second transmitting device 122, the second device 12 makes the radiation intensity of the optical signal radiated by the second device 12 greater than that radiated by the second transceiver 121 alone, so that the distance of communication through the optical signal is longer.

[0055] In some embodiments, the first emitting device 112 / the second emitting device 122 includes a field effect tube and a second light emitting tube, one end of the second light emitting tube is connected to a voltage source, the other end is connected to the drain of the field effect tube, the gate of the field effect tube is connected to the second signal input terminal, the source is grounded, and the second signal input terminal is used to connect to the first main control chip 110 / the second main control chip 120. The field effect tube forms a control circuit of the second light emitting tube to control it to emit a light signal.

[0056] In some embodiments, a fifth resistor is connected between the gate of the field effect tube and the second signal input terminal, a sixth resistor is connected to the source of the field effect tube, and a seventh resistor is connected between the second light-emitting tube and the voltage source. The seventh resistor is a current limiting resistor of the second light-emitting tube, and is used to set the working current of the second light-emitting tube. The field effect tube, the fifth resistor and the sixth resistor form a control circuit for the second light-emitting tube. For example, reference can be made to Figure 3 , Figure 3 This is a circuit diagram of the first emitting device / second emitting device of an optometry system of an embodiment. As shown in the figure, one end of the second light-emitting tube D1 is connected to the voltage source, and the other end is connected to the drain of the field effect tube Q3. The gate of the field effect tube Q3 is connected to the second signal input terminal TXD, and the source is grounded. The second signal input terminal TXD is used to connect to the first main control chip 110 / the second main control chip 120.

[0057] In practical applications, if the first transceiver 111 / the second transceiver 121 adopts Figure 2 The structure shown in the figure, the first launching device 112 / the second launching device 122 adopts Figure 3 In the structure shown, the first signal input terminal TXD led by the communication tube U2 and the second signal input terminal TXD connected by the field effect tube Q3 are connected in parallel, and their signal sources are both TX of the first main control chip 110 / the second main control chip 120. In a specific example, the second light-emitting tube D1 is a high-power LED for increasing the transmission power. The specification of the field effect tube Q3 is ZMQ-PJA3404A-NM0S, the fifth resistor R21 is 100R / 1%, the sixth resistor R33 is 10K / 5%, and the seventh resistor R13 is 1R / 1%. The voltage source is D3.3V.

[0058] In some embodiments, the first main control chip 110 / the second main control chip 120 is provided with a serial port, and the first main control chip 110 / the second main control chip 120 is connected to the first transceiver device 111 / the second transceiver device 121 through the serial port. The serial port can be, but is not limited to, a serial port that supports the IrDA communication protocol. The main control chip sends a TX signal through the serial port of the IrDA communication protocol. In addition to entering the communication tube U2, the sent TX signal also enters the triode current expansion circuit of the transmitting device in parallel, and the "high" of the TX signal is modulated to the high-power LED at the same time. The instantaneous radiation intensity of the external LED is greater, making the communication distance farther.

[0059] In some embodiments, the optical signal may be an infrared optical signal. The first light emitting tube included in the first transceiver 111 / second transceiver 121 may be an infrared light emitting tube, and the second light emitting tube included in the first transmitting device 112 / second transmitting device 122 may be an infrared light emitting tube. For example, the infrared light emitting tube uses an infrared LED.

[0060] In some embodiments, the first main control chip 110 decodes the received second electrical signal to obtain message data, and the second main control chip 120 decodes the received first electrical signal to obtain message data, and the message data includes a device address code, an instruction code, a data code, and a check code. Device address code: to distinguish devices. For example, the device address code can be used to distinguish multiple devices in the same room without interfering with each other. Instruction code: to distinguish between synchronous data messages at startup, control messages during daily work, and corresponding messages during daily work. Data code: valid data carried by the corresponding instruction. Check code: CRC check byte, which can verify the validity of a single-frame message.

[0061] In this embodiment, the first device 11 and the second device 12 of the optometry system are not limited. In some implementations, the communication process between the first device 11 and the second device 12 includes the following process:

[0062] (1) The first device 11 sends the following information:

[0063] The first main control chip 110 of the first device 11 sends a first electrical signal to the first transceiver 111 , and the first transceiver 111 converts the first electrical signal into a first optical signal and radiates it.

[0064] (2) Receiving process of the second device 12:

[0065] The second transceiver 121 of the second device 12 receives the first optical signal, decodes it to obtain a first electrical signal, and transmits it to the second main control chip 120. The second main control chip 120 analyzes the first electrical signal and makes a corresponding display output.

[0066] (3) The second device 12 sends the following information:

[0067] After executing the previous step, the second device 12 will also transmit the received message data back for synchronization between the two parties. The second main control chip 120 transmits the second electrical signal carrying the message data back to the second transceiver 121, and the second transceiver 121 converts the second electrical signal into a second optical signal and radiates it out.

[0068] (4) Receiving process of the first device 11:

[0069] The first transceiver 111 of the first device 11 receives the second optical signal, decodes it to obtain a second electrical signal and transmits it to the first main control chip 110 of the first device 11. The first main control chip 110 parses the message data carried by the second electrical signal and compares the data. If the data is different or there is no response, the message data can be retransmitted to ensure that the working status of both parties is synchronized.

[0070] In a specific example, the first device 11 may be a liquid crystal eye chart, and the second device 12 may be an automatic optometry head. The communication process between the two includes the following process:

[0071] (1) Automatic optometry head sending process:

[0072] The main control chip of the automatic optometry head uses the serial port to send command messages to the transceiver, which can be sent using the IrDA communication protocol. The transceiver then converts the electrical signal into an infrared light signal with a wavelength of 850~900nm and radiates it out.

[0073] (2) LCD eye chart receiving process:

[0074] The transceiver of the LCD eye chart receives the infrared light signal, which is decoded into a string of message data. The data is transmitted as a message instruction to the main control chip of the LCD eye chart through the IrDA communication protocol. The main control chip of the LCD eye chart parses the message instruction and makes corresponding display output.

[0075] (3) LCD eye chart sending process:

[0076] After the LCD eye chart executes the previous output, it will also send back the received message for synchronization between the two parties.

[0077] The main control chip of the LCD eye chart first uses the serial port to send back the command message to the transceiver, and the transceiver then converts the electrical signal into an infrared light signal with a wavelength of 850~900nm and radiates it out.

[0078] (4) Automatic optometry head receiving process:

[0079] The transceiver of the automatic optometry head receives the infrared light signal and decodes it into a string of message data. The data is transmitted as a message instruction to the main control chip of the automatic optometry head through the IrDA communication protocol. The main control chip parses the message instruction and compares the data. If the data is different or there is no response, the instruction message can be retransmitted to ensure the synchronization of the working status of both parties.

[0080] This optometry system realizes an optometry system with simple connection and high reliability, which can realize point-to-point communication without wiring and password connection. No password is required during the communication connection process, and the communication has two-way error prevention verification. In the 115.2Kbps low-speed mode and after current expansion, it can meet the 8-meter straight-line optometry environment. The speed performance is higher than the 2KBbps of the NEC infrared receiving tube, and the distance is also higher than the 0.7m to 2m of the traditional SIR infrared transceiver tube.

[0081] The optometry system provided by the utility model is introduced in detail above. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An optometry system, characterized in that: comprising a first device and a second device; The first device is provided with: A first main control chip that sends a first electrical signal to a first transceiver device and receives a second electrical signal transmitted by the first transceiver device; The first transceiver device is connected to the first main control chip, converts the first electrical signal into a first optical signal and radiates the first optical signal, and receives the second optical signal radiated by the second transceiver device and converts the second optical signal into the second electrical signal; The second device is provided with: A second main control chip that sends the second electrical signal to the second transceiver device and receives the first electrical signal transmitted by the second transceiver device; The second transceiver device is connected to the second main control chip, converts the second electrical signal into the second optical signal and radiates the second optical signal, and receives the first optical signal radiated by the first transceiver device and converts the first optical signal into the first electrical signal, wherein the first electrical signal and the second electrical signal respectively carry message data.

2. The optometry system according to claim 1, characterized in that: The first transceiver device / the second transceiver device comprises a communication tube, a first signal input end and a signal output end, the communication tube comprises a first light-emitting tube and a receiver, and the first signal input end and the signal output end are respectively connected to the first main control chip / the second main control chip; The first light emitting diode is used for converting the first electrical signal / the second electrical signal inputted by the first main control chip / the second main control chip through the first signal input terminal into the first optical signal / the second optical signal and radiating the first optical signal / the second optical signal; The receiver is used to receive the first optical signal / the second optical signal and convert the first optical signal / the second optical signal into the first electrical signal / the second electrical signal, and transmit the first electrical signal / the second electrical signal to the second main control chip / the first main control chip through the signal output end.

3. The optometry system according to claim 2, characterized in that: The communication tube also includes a voltage pin, a first branch led out from the voltage pin is connected to a voltage source, a first inductor is connected in series to the first branch, a second branch led out from the voltage pin is grounded, a first capacitor is connected in series to the second branch, and a third branch led out from the voltage pin is connected to a power supply end.

4. The optometry system according to claim 2, characterized in that: The communication tube further comprises a positive electrode pin, and the positive electrode pin is connected to the positive electrode of the first light-emitting tube.

5. The optometry system according to claim 2, characterized in that: A second resistor is connected between the first signal input end and the communication tube, and a third resistor is connected between the signal output end and the communication tube.

6. The optometry system according to claim 1, characterized in that: The first device is also provided with: a first transmitting device connected to the first main control chip, which converts the first electrical signal into the first optical signal and radiates the first optical signal, wherein the second transceiver is further used to receive the first optical signal radiated by the first transmitting device and convert the first optical signal into the first electrical signal; Or / and, the second device is further provided with: A second transmitting device connected to the second main control chip, converting the second electrical signal into the second optical signal and radiating the second optical signal, wherein the first transceiver is also used to receive the second optical signal radiated by the second transmitting device and convert the second optical signal into the second electrical signal.

7. The optometry system according to claim 6, characterized in that: The first emitting device / the second emitting device includes a field effect tube and a second light-emitting tube, one end of the second light-emitting tube is connected to a voltage source, and the other end is connected to the drain of the field effect tube, the gate of the field effect tube is connected to the second signal input end, and the source is grounded, and the second signal input end is used to connect to the first main control chip / the second main control chip.

8. The optometry system according to claim 7, characterized in that: A fifth resistor is connected between the gate of the field effect tube and the second signal input terminal, a sixth resistor is connected to the source of the field effect tube, and a seventh resistor is connected between the second light-emitting tube and the voltage source.

9. The optometry system according to claim 1, characterized in that: The first main control chip / the second main control chip is provided with a serial port, and the first main control chip / the second main control chip is connected to the first transceiver device / the second transceiver device through the serial port.

10. The optometry system according to claim 1, characterized in that: The optical signal comprises an infrared optical signal.

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