Remote experiment control system and control method thereof

Abstract

The invention discloses a remote experiment control system and a control method thereof, and the system comprises an experiment table, the experiment table is provided with a PCB for experiment, the PCB is provided with a control unit and a drive extension unit, the PCB is also provided with a relay extension unit, the relay extension unit comprises a plurality of relays, and the relays are connected with the control unit and the drive extension unit. The relays are communicated with each other according to an inverted triangle arrangement mode. The problem that in the prior art, a traditional testing system is high in cost is solved. The device has the advantages of being simple in structure, convenient to use, low in cost and the like.

Description

Technical Field

[0001] The present invention relates to the field of remote control technology, and more specifically, to a remote experiment control system and a control method thereof. Background Art

[0002] At present, a remote experiment control system and control method are disclosed on the Chinese Patent Network, with the publication number CN114488900A. The remote experiment control system includes: a control unit, a drive expansion unit, and a relay expansion unit, and the control unit, the drive expansion unit, and the relay expansion unit are connected by industrial 2.54mm connectors and FPC connectors. The present invention designs a remote experiment control system and control method, which not only saves students' time going back and forth to the laboratory, but also avoids students from being unable to go to the laboratory to do experiments due to various objective reasons. Eliminating this process also improves students' enthusiasm for learning to a certain extent, because the convenience can give students who are originally unwilling to go to the laboratory an additional choice.

[0003] Although the remote experimental control system and control method in the above patent have the advantage of saving time for running back and forth to the laboratory, the experimental system requires a large number of relays, resulting in a high cost of the experimental system. Summary of the invention

[0004] In order to overcome the problem of high cost of traditional test systems in the prior art, the present invention provides a remote test control system and a control method thereof which optimizes the number and layout of relays to reduce costs.

[0005] A remote experiment control system and a control method thereof of the present invention comprise an experiment platform, wherein the experiment platform is provided with a PCB board for experiment, the PCB board is provided with a control unit and a drive extension unit, the PCB board is further provided with a relay extension unit, the relay extension unit comprises a plurality of relays, and the relays are interconnected in an inverted triangle arrangement.

[0006] Preferably, the relay expansion unit includes input terminal 1, input terminal 2, input terminal 3, input terminal 4, input terminal 5, input terminal 6, input terminal 7, input terminal 8, input terminal 9, input terminal 10, relay K1, relay K7, relay K16, relay K17, relay K18, relay K19, relay K21, relay K22, relay K23, relay K24, relay K25, relay K26, relay K27, relay K28, relay K29, relay K30, relay K31, relay K32, relay K33, relay K34, relay K35, relay K36, relay K37, relay K38, relay The output end of the input terminal 1 is electrically connected to one end of the relay K1, and the other end of the relay K1 is electrically connected to one end of the relay K6, one end of the relay K11, one end of the relay K16, one end of the relay K21, one end of the relay K26, one end of the relay K31, one end of the relay K36, one end of the relay K41 and one end of the relay K46 respectively, and the other end of the relay K6 is electrically connected to the output end of the input terminal 2, and the relay K12 is electrically connected to one end of the relay K16. The other end of relay K11 is electrically connected to the output end of input terminal 3, the other end of relay K16 is electrically connected to the output end of input terminal 4, the other end of relay K21 is electrically connected to the output end of input terminal 5, the other end of relay K26 is electrically connected to the output end of input terminal 6, the other end of relay K31 is electrically connected to the output end of input terminal 7, the other end of relay K36 is electrically connected to the output end of input terminal 8, the other end of relay K41 is electrically connected to the output end of input terminal 9, the other end of relay K46 is electrically connected to the output end of input terminal 10, one end of relay K7 is electrically connected to the output end of input terminal 2, and the other end of relay K7 is electrically connected to relay K12 respectively. one end of the relay K17, one end of the relay K22, one end of the relay K27, one end of the relay K32, one end of the relay K37, one end of the relay K42 and one end of the relay K47 are electrically connected, the other end of the relay K12 is electrically connected to the output end of the input terminal 3, the other end of the relay K17 is electrically connected to the output end of the input terminal 4, the other end of the relay K22 is electrically connected to the output end of the input terminal 5, the other end of the relay K27 is electrically connected to the output end of the input terminal 6, the other end of the relay K32 is electrically connected to the output end of the input terminal 7, and the other end of the relay K37 is electrically connected to the output end of the input terminal 8,The other end of the relay K42 is electrically connected to the output end of the input terminal 9, the other end of the relay K47 is electrically connected to the output end of the input terminal 10, one end of the relay K13 is electrically connected to the output end of the input terminal 3, the other end of the relay K13 is electrically connected to one end of the relay K18, one end of the relay K23, one end of the relay K28, one end of the relay K33, one end of the relay K38, one end of the relay K43 and one end of the relay K48 respectively, the other end of the relay K18 is electrically connected to the output end of the input terminal 4, the other end of the relay K23 is electrically connected to the output end of the input terminal 5, the other end of the relay K28 is electrically connected to the output end of the input terminal 6, the other end of the relay K33 is electrically connected to the output end of the input terminal 7, the other end of the relay K38 is electrically connected to the output end of the input terminal 8, the other end of the relay K43 is electrically connected to the output end of the input terminal 9, and the other end of the relay K48 is electrically connected to the output end of the input terminal 1 0 is electrically connected, one end of the relay K19 is electrically connected to the output end of the input terminal 4, the other end of the relay K19 is electrically connected to one end of the relay K24, one end of the relay K29, one end of the relay K34, one end of the relay K39, one end of the relay K44 and one end of the relay K49 respectively, the other end of the relay K24 is electrically connected to the output end of the input terminal 5, the other end of the relay K29 is electrically connected to the output end of the input terminal 6, the other end of the relay K34 is electrically connected to the output end of the input terminal 7, the other end of the relay K39 is electrically connected to the output end of the input terminal 8, the other end of the relay K44 is electrically connected to the output end of the input terminal 9, the other end of the relay K49 is electrically connected to the output end of the input terminal 10, one end of the terminal K25 is electrically connected to one end of the relay K30, one end of the relay K35, one end of the relay K40, one end of the relay K45 and one end of the relay K50, The other end of the relay K25 is electrically connected to the output end of the input terminal 5, the other end of the relay K30 is electrically connected to the output end of the input terminal 6, the other end of the relay K35 is electrically connected to the output end of the input terminal 7, the other end of the relay K40 is electrically connected to the output end of the input terminal 8, the other end of the relay K45 is electrically connected to the output end of the input terminal 9, and the other end of the relay K50 is electrically connected to the output end of the input terminal 10. The input terminal is connected to the normally open end of the relay. Preferably, the control unit includes a main control chip, an isolation communication chip, and a digital logic chip. The isolation communication chip converts the communication signal transmitted from the host computer and transmits it to the main control chip. After processing, the main control chip sends the output line number to the digital logic chip and then transmits it to the drive expansion unit.

[0007] Preferably, the drive expansion unit includes a displacement cache chip, a digital isolation chip, and a drive chip. After receiving the signal sent by the control unit, the displacement cache chip sends the signal to the digital isolation chip for signal isolation, and then outputs the signal to the drive chip to send the output drive signal to the relay expansion unit. The input end of the input terminal 1, the input end of the input terminal 2, the input end of the input terminal 3, the input end of the input terminal 4, the input end of the input terminal 5, the input end of the input terminal 6, the input end of the input terminal 7, the input end of the input terminal 8, the input end of the input terminal 9 and the input end of the input terminal 10 are electrically connected to the IO port of the drive chip respectively. Each relay coil terminal is electrically connected to the IO port of the driver chip. Sexual connection.

[0008] Preferably, the control unit, the drive expansion unit and the relay expansion unit are connected by industrial 2.54mm connectors and FPC connectors.

[0009] The control method is: When conducting a remote test, first turn on the host computer and remotely connect to the control unit through the network; After completing the remote connection, the control unit will then perform a self-check on each relay, and the user can display the working status of each relay on the display interface of the host computer; On the display interface of the host computer, several boxes are used to represent each relay, and the boxes are arranged in the same position as the relay. In each box, there are circles, X-shaped and triangles from left to right. The circle represents that the relay is working normally, the X-shaped represents that the relay is not working, and the triangle represents that the current relay is abnormal and cannot be used. After the self-check is completed, the user can click the box representing the relay to be started. If the relay is normal at this time, the circular part of the box will display green, and the relay is in normal working state; the box that is not clicked will display gray in the X-shaped part, and the relay is not working. If the relay is abnormal at this time, the box representing the relay will display yellow in the triangular part, reminding the user that the relay is abnormal and cannot be used. During the test, the user can arbitrarily select and press the box represented by the relay for the required test on the upper computer display interface. The upper computer will then send a start command to the control unit through the network, and start the corresponding relay by driving the expansion unit. After the relay is started, the box on the upper computer display interface will display green to remind the user that the relay is working normally at this time; if you want to turn off the relay, just click the box again. The upper computer will then send a close command to the control unit through the network, and turn off the corresponding relay by driving the expansion unit. After the relay is turned off, the box on the upper computer display interface will display gray to remind the user that the relay is turned off at this time.

[0010] This device uses a relay array that can significantly reduce the number of relays through layout and algorithm optimization. When working, first determine how many relays in the first 4 rows need to be opened, then find the smallest number of output terminals in each group and sort them from small to large to determine which relays need to be opened in the first to fourth rows, and then calculate the serial number of the specific relay to be opened.

[0011] For example, it is necessary to turn on the relays represented by K1, K21, and K26 in the first row, the relays represented by K7 and K17 in the second row, the relays represented by K13 and K33 in the third row, and the relays represented by K39 and K49 in the fourth row. The layout is further optimized by combining the above algorithm. Except for the first row, the number of relays in each subsequent row can be one less than the previous row. According to the algorithm combined with the layout, the number of relays required for traditional test equipment can be reduced from 10×5=50 to 10+9+8+7+6=40, thereby reducing the cost of test equipment.

[0012] The present invention can meet the increasing demand for remote experiments. After the teacher has taught the theoretical course in the classroom, the students do not have to go to the laboratory in person, but can complete the experimental operation online, which can quickly combine theory with experiment. In view of the shortcomings that most of the remote experiments currently carried out in schools are pure simulations and students cannot see the actual phenomena, this device was developed, which allows users to remotely connect to the actual hardware. This system not only saves students the time of going back and forth to the laboratory, but also avoids students from being unable to go to the laboratory to do experiments due to various objective reasons. Eliminating this process also improves students' enthusiasm for learning to a certain extent, because the convenience can give students who are originally unwilling to go to the laboratory an additional choice.

[0013] The system can transmit the circuit connection edited by the user in the host computer to the main control board, and then control the driver board to drive the relay board to realize any connection of components. And after optimizing the layout and algorithm, the number of relays can be greatly reduced to reduce the test cost.

[0014] The invention has the following beneficial effects: simple structure, convenient use and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 The figure is a circuit schematic diagram of the relay expansion unit of the present invention.

[0016] Attached Figure 2 It is a schematic diagram of the display interface of the host computer of the present invention. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0018] Embodiment: According to the attached Figure 1 and attached Figure 2 To further explain, a remote experiment control system and a control method thereof include a test bench, a PCB board for experiment is provided on the test bench, a control unit and a drive extension unit are provided on the PCB board, a relay extension unit is also provided on the PCB board, the relay extension unit includes a plurality of relays, and the relays are interconnected in an inverted triangle arrangement.

[0019] The relay expansion unit includes input terminal 1, input terminal 2, input terminal 3, input terminal 4, input terminal 5, input terminal 6, input terminal 7, input terminal 8, input terminal 9, input terminal 10, relay K1, relay K7, relay K16, relay K17, relay K18, relay K19, relay K21, relay K22, relay K23, relay K24, relay K25, relay K26, relay K27, relay K28, relay K29, relay K30, relay K31, relay K32, relay K33, relay K34, relay K35, relay K36, relay K37, relay K38, relay K39, relay K40, relay K41, relay K42, relay K43, relay K44, relay K45, relay K46, relay K47, relay K48, relay K49, relay K50, relay K51, relay K52, relay K53, relay K54, relay K55, relay K56, relay K57, relay K58, relay K59, relay K60, relay K61, relay K62, relay K63, relay K64, relay K65 9. Relay K40, relay K41, relay K42, relay K43, relay K44, relay K45, relay K46, relay K47, relay K48, relay K49, relay K50, the output end of the input terminal 1 is electrically connected to one end of the relay K1, the other end of the relay K1 is electrically connected to one end of the relay K6, one end of the relay K11, one end of the relay K16, one end of the relay K21, one end of the relay K26, one end of the relay K31, one end of the relay K36, one end of the relay K41 and one end of the relay K46, the other end of the relay K6 is electrically connected to the output end of the input terminal 2, relay K1 The other end of relay K1 is electrically connected to the output end of input terminal 3, the other end of relay K16 is electrically connected to the output end of input terminal 4, the other end of relay K21 is electrically connected to the output end of input terminal 5, the other end of relay K26 is electrically connected to the output end of input terminal 6, the other end of relay K31 is electrically connected to the output end of input terminal 7, the other end of relay K36 is electrically connected to the output end of input terminal 8, the other end of relay K41 is electrically connected to the output end of input terminal 9, the other end of relay K46 is electrically connected to the output end of input terminal 10, one end of relay K7 is electrically connected to the output end of input terminal 2, and the other end of relay K7 is electrically connected to the output end of relay K12 respectively. one end, one end of relay K17, one end of relay K22, one end of relay K27, one end of relay K32, one end of relay K37, one end of relay K42 and one end of relay K47 are electrically connected, the other end of relay K12 is electrically connected to the output end of input terminal 3, the other end of relay K17 is electrically connected to the output end of input terminal 4, the other end of relay K22 is electrically connected to the output end of input terminal 5, the other end of relay K27 is electrically connected to the output end of input terminal 6, the other end of relay K32 is electrically connected to the output end of input terminal 7, and the other end of relay K37 is electrically connected to the output end of input terminal 8,The other end of the relay K42 is electrically connected to the output end of the input terminal 9, the other end of the relay K47 is electrically connected to the output end of the input terminal 10, one end of the relay K13 is electrically connected to the output end of the input terminal 3, the other end of the relay K13 is electrically connected to one end of the relay K18, one end of the relay K23, one end of the relay K28, one end of the relay K33, one end of the relay K38, one end of the relay K43 and one end of the relay K48, the other end of the relay K18 is electrically connected to the output end of the input terminal 4, the other end of the relay K23 is electrically connected to the output end of the input terminal 5 The output end of the relay K28 is electrically connected to the output end of the input terminal 6, the other end of the relay K33 is electrically connected to the output end of the input terminal 7, the other end of the relay K38 is electrically connected to the output end of the input terminal 8, the other end of the relay K43 is electrically connected to the output end of the input terminal 9, the other end of the relay K48 is electrically connected to the output end of the input terminal 10, one end of the relay K19 is electrically connected to the output end of the input terminal 4, and the other end of the relay K19 is respectively connected to one end of the relay K24, one end of the relay K29, one end of the relay K34, and one end of the relay K48. One end of the relay K39, one end of the relay K44 and one end of the relay K49 are electrically connected, the other end of the relay K24 is electrically connected to the output end of the input terminal 5, the other end of the relay K29 is electrically connected to the output end of the input terminal 6, the other end of the relay K34 is electrically connected to the output end of the input terminal 7, the other end of the relay K39 is electrically connected to the output end of the input terminal 8, the other end of the relay K44 is electrically connected to the output end of the input terminal 9, the other end of the relay K49 is electrically connected to the output end of the input terminal 10, one end of the terminal K25 is electrically connected to one end of the relay K30 The end, one end of the relay K35, one end of the relay K40, one end of the relay K45, and one end of the relay K50 are electrically connected, the other end of the relay K25 is electrically connected to the output end of the input terminal 5, the other end of the relay K30 is electrically connected to the output end of the input terminal 6, the other end of the relay K35 is electrically connected to the output end of the input terminal 7, the other end of the relay K40 is electrically connected to the output end of the input terminal 8, the other end of the relay K45 is electrically connected to the output end of the input terminal 9, and the other end of the relay K50 is electrically connected to the output end of the input terminal 10. The input terminal is connected to the normally open end of the relay. The control unit includes a main control chip, an isolation communication chip, and a digital logic chip. The isolation communication chip converts and transmits the communication signal transmitted from the host computer to the main control chip.The main control chip processes and sends the output line number to the digital logic chip and then transmits it to the drive expansion unit.

[0020] The driver expansion unit includes a displacement buffer chip, a digital isolation chip, and a driver chip. After receiving the signal from the control unit, the displacement buffer chip sends it to the digital isolation chip for signal isolation, and then outputs the signal to the driver chip to send the output drive signal to the relay expansion unit. The input end of the input terminal 1, the input end of the input terminal 2, the input end of the input terminal 3, the input end of the input terminal 4, the input end of the input terminal 5, the input end of the input terminal 6, the input end of the input terminal 7, the input end of the input terminal 8, the input end of the input terminal 9, and the input end of the input terminal 10 are electrically connected to the IO port of the driver chip respectively. Each relay coil end is electrically connected to the IO port of the driver chip.

[0021] The control unit, the drive expansion unit and the relay expansion unit are connected by industrial 2.54mm connectors and FPC connectors.

[0022] The control method is: When conducting a remote test, first turn on the host computer and remotely connect to the control unit through the network; After completing the remote connection, the control unit will then perform a self-check on each relay, and the user can display the working status of each relay on the display interface of the host computer; On the display interface of the host computer, several boxes are used to represent each relay, and the boxes are arranged in the same position as the relay. In each box, there are circles, X-shaped and triangles from left to right. The circle represents that the relay is working normally, the X-shaped represents that the relay is not working, and the triangle represents that the current relay is abnormal and cannot be used. After the self-check is completed, the user can click the box representing the relay to be started. If the relay is normal at this time, the circular part of the box will display green, and the relay is in normal working state; the box that is not clicked will display gray in the X-shaped part, and the relay is not working. If the relay is abnormal at this time, the box representing the relay will display yellow in the triangular part, reminding the user that the relay is abnormal and cannot be used. During the test, the user can arbitrarily select and press the box represented by the relay for the required test on the upper computer display interface. The upper computer will then send a start command to the control unit through the network, and start the corresponding relay by driving the expansion unit. After the relay is started, the box on the upper computer display interface will display green to remind the user that the relay is working normally at this time; if you want to turn off the relay, just click the box again. The upper computer will then send a close command to the control unit through the network, and turn off the corresponding relay by driving the expansion unit. After the relay is turned off, the box on the upper computer display interface will display gray to remind the user that the relay is turned off at this time.

[0023] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A remote experiment control system, comprising an experimental platform, on which a PCB board for experiment is provided, on which a control unit and a drive expansion unit are provided, characterized in that: The PCB board is also provided with a relay expansion unit, and the relay expansion unit includes a plurality of relays, and the relays are interconnected in an inverted triangle arrangement.

2. A remote experiment control system according to claim 1, characterized in that: The relay expansion unit includes input terminal 1, input terminal 2, input terminal 3, input terminal 4, input terminal 5, input terminal 6, input terminal 7, input terminal 8, input terminal 9, input terminal 10, relay K1, relay K7, relay K16, relay K17, relay K18, relay K19, relay K21, relay K22, relay K23, relay K24, relay K25, relay K26, relay K27, relay K28, relay K29, relay K30, relay K31, relay K32, relay K33, relay K34, relay K35, relay K36, relay K37, relay K38, relay K39, relay K40, relay K41, relay K42, relay K43, relay K44, relay K45, relay K46, relay K47, relay K48, relay K49, relay K50, relay K51, relay K52, relay K53, relay K54, relay K55, relay K56, relay K57, relay K58, relay K59, relay K60, relay K61, relay K62, relay K63, relay K64, relay K65 9. Relay K40, relay K41, relay K42, relay K43, relay K44, relay K45, relay K46, relay K47, relay K48, relay K49, relay K50, the output end of the input terminal 1 is electrically connected to one end of the relay K1, the other end of the relay K1 is electrically connected to one end of the relay K6, one end of the relay K11, one end of the relay K16, one end of the relay K21, one end of the relay K26, one end of the relay K31, one end of the relay K36, one end of the relay K41 and one end of the relay K46, the other end of the relay K6 is electrically connected to the output end of the input terminal 2, relay K1 The other end of relay K1 is electrically connected to the output end of input terminal 3, the other end of relay K16 is electrically connected to the output end of input terminal 4, the other end of relay K21 is electrically connected to the output end of input terminal 5, the other end of relay K26 is electrically connected to the output end of input terminal 6, the other end of relay K31 is electrically connected to the output end of input terminal 7, the other end of relay K36 is electrically connected to the output end of input terminal 8, the other end of relay K41 is electrically connected to the output end of input terminal 9, the other end of relay K46 is electrically connected to the output end of input terminal 10, one end of relay K7 is electrically connected to the output end of input terminal 2, and the other end of relay K7 is electrically connected to the output end of relay K12 respectively. one end, one end of relay K17, one end of relay K22, one end of relay K27, one end of relay K32, one end of relay K37, one end of relay K42 and one end of relay K47 are electrically connected, the other end of relay K12 is electrically connected to the output end of input terminal 3, the other end of relay K17 is electrically connected to the output end of input terminal 4, the other end of relay K22 is electrically connected to the output end of input terminal 5, the other end of relay K27 is electrically connected to the output end of input terminal 6, the other end of relay K32 is electrically connected to the output end of input terminal 7, and the other end of relay K37 is electrically connected to the output end of input terminal 8,The other end of the relay K42 is electrically connected to the output end of the input terminal 9, the other end of the relay K47 is electrically connected to the output end of the input terminal 10, one end of the relay K13 is electrically connected to the output end of the input terminal 3, the other end of the relay K13 is electrically connected to one end of the relay K18, one end of the relay K23, one end of the relay K28, one end of the relay K33, one end of the relay K38, one end of the relay K43 and one end of the relay K48, the other end of the relay K18 is electrically connected to the output end of the input terminal 4, the other end of the relay K23 is electrically connected to the output end of the input terminal 5 The output end of the relay K28 is electrically connected to the output end of the input terminal 6, the other end of the relay K33 is electrically connected to the output end of the input terminal 7, the other end of the relay K38 is electrically connected to the output end of the input terminal 8, the other end of the relay K43 is electrically connected to the output end of the input terminal 9, the other end of the relay K48 is electrically connected to the output end of the input terminal 10, one end of the relay K19 is electrically connected to the output end of the input terminal 4, and the other end of the relay K19 is respectively connected to one end of the relay K24, one end of the relay K29, one end of the relay K34, and one end of the relay K48. One end of the relay K39, one end of the relay K44 and one end of the relay K49 are electrically connected, the other end of the relay K24 is electrically connected to the output end of the input terminal 5, the other end of the relay K29 is electrically connected to the output end of the input terminal 6, the other end of the relay K34 is electrically connected to the output end of the input terminal 7, the other end of the relay K39 is electrically connected to the output end of the input terminal 8, the other end of the relay K44 is electrically connected to the output end of the input terminal 9, the other end of the relay K49 is electrically connected to the output end of the input terminal 10, one end of the terminal K25 is electrically connected to one end of the relay K30 The other end of the relay K25 is electrically connected to the output end of the input terminal 5, the other end of the relay K30 is electrically connected to the output end of the input terminal 6, the other end of the relay K35 is electrically connected to the output end of the input terminal 7, the other end of the relay K40 is electrically connected to the output end of the input terminal 8, the other end of the relay K45 is electrically connected to the output end of the input terminal 9, and the other end of the relay K50 is electrically connected to the output end of the input terminal 10.

3. A remote experiment control system according to claim 1, characterized in that: The control unit includes a main control chip, an isolation communication chip, and a digital logic chip. The isolation communication chip converts the communication signal transmitted from the host computer and transmits it to the main control chip. After processing, the main control chip sends the output line number to the digital logic chip and then transmits it to the drive expansion unit.

4. A remote experiment control system according to claim 2, characterized in that: The drive expansion unit includes a displacement cache chip, a digital isolation chip, and a drive chip. After receiving the signal sent by the control unit, the displacement cache chip sends it to the digital isolation chip for signal isolation, and then outputs the signal to the drive chip to send the output drive signal to the relay expansion unit. The input end of the input terminal 1, the input end of the input terminal 2, the input end of the input terminal 3, the input end of the input terminal 4, the input end of the input terminal 5, the input end of the input terminal 6, the input end of the input terminal 7, the input end of the input terminal 8, the input end of the input terminal 9 and the input end of the input terminal 10 are electrically connected to the IO port of the drive chip respectively.

5. A remote experiment control system according to claim 1, characterized in that: The control unit, the drive expansion unit and the relay expansion unit are connected by industrial 2.54mm connectors and FPC connectors.

6. A control method suitable for a remote experiment control system as claimed in claim 1, characterized in that: The control method is: When conducting a remote test, first turn on the host computer and remotely connect to the control unit through the network; After completing the remote connection, the control unit will then perform a self-check on each relay, and the user can display the working status of each relay on the display interface of the host computer; On the display interface of the host computer, several boxes are used to represent each relay, and the boxes are arranged in the same position as the relay. In each box, there are circles, X-shaped and triangles from left to right. The circle represents that the relay is working normally, the X-shaped represents that the relay is not working, and the triangle represents that the current relay is abnormal and cannot be used. After the self-check is completed, the user can click the box representing the relay to be started. If the relay is normal at this time, the circular part of the box will display green, and the relay is in normal working state; the box that is not clicked will display gray in the X-shaped part, and the relay is not working. If the relay is abnormal at this time, the box representing the relay will display yellow in the triangular part, reminding the user that the relay is abnormal and cannot be used. During the test, the user can arbitrarily select and press the box represented by the relay for the required test on the upper computer display interface. The upper computer will then send a start command to the control unit through the network, and start the corresponding relay by driving the expansion unit. After the relay is started, the box on the upper computer display interface will display green to remind the user that the relay is working normally at this time; if you want to turn off the relay, just click the box again. The upper computer will then send a close command to the control unit through the network, and turn off the corresponding relay by driving the expansion unit. After the relay is turned off, the box on the upper computer display interface will display gray to remind the user that the relay is turned off at this time.

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