Data acquisition terminal switching device

Abstract

The utility model relates to the technical field of elevator Internet of Things, in particular to a data acquisition terminal switching device, which comprises a switcher electrically connected with an elevator mainboard interface J1, a signal switching circuit is arranged in the switcher, and two channels of the signal switching circuit are respectively connected with an Internet of Things data acquisition terminal and a manual operator; the signal switching circuit comprises an operational amplifier U1 and an analog switch U2, an output end of the operational amplifier U1 is connected with a selection end SEL of the analog switch U2, a B0 channel of the analog switch U2 is suspended, a B1 channel of the analog switch U2 is connected with an Internet of Things data acquisition terminal, high or low level is received according to the selection end SEL of the analog switch U2, so that a control end A of the analog switch U2 selects the B0 channel or the B1 channel to be switched on, and the B0 channel or the B1 channel is switched off. Whether the Internet of Things data acquisition terminal communicates with the elevator mainboard or not is judged; according to the device, an elevator mainboard interface signal is divided into two parts, so that automatic identification and switching between an elevator Internet of Things data acquisition terminal and a manual operator are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator Internet of Things, in particular to a data acquisition terminal switching device. Background Art

[0002] The elevator IoT data collection terminal reads real-time elevator data, including alarms and fault conditions, through the "SVT" handheld operator communication port. The data is then sent to a server for processing and displayed on a PC or mobile app, enabling timely responses to abnormal conditions such as elevator malfunctions. Each elevator mainboard typically has only one communication port, and the elevator IoT data collection terminal must remain connected. This forces maintenance personnel to frequently plug and unplug the port when using the handheld operator, increasing the risk of damage and potentially forgetting to reconnect the IoT data collection terminal after repairs. Existing serial port hubs on the market simply split the signal in two, failing to meet the practical needs of elevator IoT data collection. Furthermore, they require the IoT data collection terminal and the handheld operator to be connected to the elevator mainboard simultaneously. When both are operating simultaneously, the elevator mainboard will receive two simultaneous request signals, causing interference between the data collection terminal and the handheld operator, rendering them unable to process and resulting in neither receiving return data. If the data acquisition terminal and the handheld operator are physically connected at the same time, even if only one of the devices is working, the working device will output a low level and the non-working device will output a high level. Since the two devices are connected in parallel, the elevator mainboard will always receive a high level, and the data acquisition terminal and the handheld operator will not be able to receive the returned data normally. Utility Model Content

[0003] In order to solve the above technical problems, the present utility model specifically adopts the following technical solutions.

[0004] Design a data acquisition terminal switching device, including a switch electrically connected to the elevator mainboard interface J1, a signal switching circuit is provided in the switch, and the two channels of the signal switching circuit are connected to the Internet of Things data acquisition terminal and the handheld operator respectively;

[0005] The signal switching circuit includes an operational amplifier U1 and an analog switch U2. The output end of the operational amplifier U1 is connected to the selection end SEL of the analog switch U2. The B0 channel of the analog switch U2 is set to be suspended, and the B1 channel is connected to the Internet of Things data acquisition terminal.

[0006] The elevator mainboard provides a power supply voltage for the signal switching circuit, and the voltage input end of the signal switching circuit is connected in series with a resistor R1 for connection to the handheld operator. At the same time, the resistor R1 is connected to the non-inverting input end of the operational amplifier U1. The voltage divider resistors R2 and R3 are connected in series between the voltage input end and the ground end. The inverting input end of the operational amplifier U1 is connected between the voltage divider resistors R2 and R3.

[0007] Preferably, the signal switching circuit is integrated into the elevator mainboard interface J1.

[0008] Preferably, the elevator mainboard interface J1 is connected to the switch via a connector P1, and the switch is connected to the Internet of Things data acquisition terminal and the handheld operator respectively via a connector P2.

[0009] Preferably, an RC filter circuit is connected in parallel between the operational amplifier U1 and the VCC terminal of the analog switch U2.

[0010] The beneficial effects of the present invention are:

[0011] 1. This utility model uses an operational amplifier to detect whether a handheld operator is connected, thereby achieving automatic identification of the operator. When the handheld operator is connected, the communication between the elevator IoT data acquisition terminal and the elevator mainboard is automatically disconnected. When the handheld operator is disconnected, the elevator IoT data acquisition terminal continues to operate, ensuring data continuity and integrity. This helps to better monitor the elevator's operating status and promptly identify potential problems. When the handheld operator is disconnected, communication between the elevator IoT data acquisition terminal and the elevator mainboard is automatically restored without manual intervention, thus improving the device's level of automation.

[0012] 2. This application reduces the problem of interface damage caused by frequent plugging and unplugging, and extends the service life of the equipment. When maintenance personnel perform fault diagnosis and repair, they only need to connect the handheld operator, and the system will automatically complete the communication switching without the need to manually disconnect and reconnect the elevator Internet of Things data acquisition terminal, which greatly simplifies the maintenance process and improves work efficiency.

[0013] In summary, this application effectively solves the problem of frequent plugging and unplugging interfaces during traditional elevator maintenance by splitting the elevator motherboard interface signal into two and using an operational amplifier and analog switch to achieve automatic identification and switching. This improves the device's automation, reliability, and maintenance efficiency. It also ensures data continuity and integrity, providing strong support for the long-term stable operation of elevators. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a pin connection diagram of the elevator mainboard interface, the handheld operator, and the Internet of Things data acquisition terminal interface;

[0016] Figure 3 and Figure 4 Here is a pinout diagram of the two connectors on the switch;

[0017] Figure 5 It is a circuit connection diagram of the signal switching circuit; DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0019] Example 1

[0020] A data acquisition terminal switching device, such as Figures 1 to 5 As shown, it includes a switcher electrically connected to the elevator mainboard interface J1. A signal switching circuit is provided in the switcher. The signal switching circuit is integrated into the elevator mainboard interface J1. The two channels of the signal switching circuit are connected to the Internet of Things data acquisition terminal and the handheld operator respectively.

[0021] like Figure 2-Figure 4 As can be seen, the elevator mainboard interface J1 is connected to the switch via connector P1, and the switch is connected to the IoT data acquisition terminal and handheld operator via connector P2. The switch is powered by connecting pins 1 and 5 of elevator mainboard interface J1 to pins 1 and 3 of connector P1. Pins 4 (5V OUT) and 1 (GND) of connector P2 are connected to pins 1 (5V OUT) and 5 (GND) of handheld operator interface J2 to power the handheld operator. The elevator mainboard signal + (RXD P) is connected to pin 2 (RED P) of switch connector P1 and output to pin 4 (Signal + / RXD PS) of elevator IoT data acquisition terminal J3 via pin 2 (Signal + / RXD PS) of switch P2. Terminal 3 (SEL) of connector P2 is the signal output for the handheld operator.

[0022] By the attached Figure 5 It can be seen that the signal switching circuit includes an operational amplifier U1 and an analog switch U2. The output end of the operational amplifier U1 is connected to the selection end SEL of the analog switch U2. The B0 channel of the analog switch U2 is set to be floating, and the B1 channel is connected to the Internet of Things data acquisition terminal. According to whether the selection end SEL of the analog switch U2 receives a high or low level, the control end A of the analog switch U2 selects the B0 or ​​B1 channel to be connected, thereby determining whether the Internet of Things data acquisition terminal is communicating with the elevator mainboard. In this embodiment, the operational amplifier U1 is used as a voltage comparator.

[0023] The elevator mainboard provides power supply voltage for the signal switching circuit, and the voltage input end of the signal switching circuit is connected in series with resistor R1 and is used to connect to the handheld operator. At the same time, resistor R1 is connected to the non-inverting input end of the operational amplifier U1. Voltage divider resistors R2 and R3 are connected in series between the voltage input end and the ground end. The inverting input end of the operational amplifier U1 is connected between the voltage divider resistors R2 and R3.

[0024] An RC filter circuit is connected in parallel between the operational amplifier U1 and the VCC terminal of the analog switch U2, and the RC filter circuit is composed of a resistor R4 and a capacitor C1.

[0025] The elevator motherboard's operating voltage is 5V DC. Pin 1 (power +) of the elevator motherboard interface J1 inputs a 4.975V DC voltage to reference terminal 3 of the operational amplifier U1 through voltage divider resistors R2 (50Ω) and R3 (10KΩ). The calculation formula is: 5 / (R2+R3)*R3.

[0026] =5 / (50+10000)*10000

[0027] =4.975V

[0028] When the handheld operator is not connected, the voltage value of the comparison terminal 1 of the operational amplifier U1 is 5V, which is greater than the voltage of the reference terminal 3 4.975V. The operational amplifier U1 outputs a high level to the selection terminal SEL of the analog switch U2, so that the control terminal A of the analog switch U2 controls the B1 channel of the analog signal + (RXD PS) to be turned on. At this time, the Internet of Things data acquisition terminal communicates normally with the elevator mainboard.

[0029] When the handheld operator is connected, due to the insertion of a 1Ω detection resistor R1 in series in the power supply circuit of the handheld operator, the measured voltage input to the comparison terminal 1 of the operational amplifier U1 is 4.95V. At this time, the voltage value of the comparison terminal 1 of the operational amplifier U1, 4.95V, is less than the voltage of the reference terminal 3, 4.975V. The operational amplifier U1 outputs a low level to the select terminal SEL of the analog switch U2. The control terminal A automatically disconnects the B1 channel and switches to the B0 channel output. Because the B0 channel is set to floating, the handheld operator and the elevator mainboard communicate directly without passing through the switch circuit board. When the handheld operator is disconnected, the change in the voltage of the comparison terminal 1 of the operational amplifier U1 causes the switch to automatically switch back to the B1 channel, allowing the IoT data acquisition terminal and the elevator mainboard to communicate normally again.

[0030] In this embodiment, since the elevator IoT data acquisition terminal is always connected to the elevator mainboard, the handheld operator is only used to detect an elevator malfunction during maintenance, and its connection to the mainboard is temporary. This invention splits the elevator mainboard interface signal into two channels. One channel maintains a permanent physical connection to the elevator IoT data acquisition terminal, while the other channel automatically recognizes when the handheld operator is connected and signals the connection to the outside world. This automatically disconnects the elevator IoT data acquisition terminal from the mainboard, maintaining only communication between the handheld operator and the mainboard. After elevator maintenance is complete, the handheld operator disconnects physically from the mainboard, and the elevator IoT data acquisition terminal automatically resumes communication with the mainboard.

[0031] Working principle of this device: The switch compares the input voltage of operational amplifier U1 with the reference voltage, and determines whether a handheld operator is connected by detecting the change in voltage. When the handheld operator is not connected to the elevator mainboard, the Internet of Things data acquisition terminal communicates normally with the elevator mainboard; when the handheld operator is connected to the elevator mainboard, the communication connection between the Internet of Things data acquisition terminal and the elevator mainboard is automatically disconnected.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A data acquisition terminal switching device, characterized in that: It includes a switch electrically connected to the elevator mainboard interface J1, wherein a signal switching circuit is provided in the switch, and two channels of the signal switching circuit are respectively connected to the Internet of Things data acquisition terminal and the handheld operator; The signal switching circuit includes an operational amplifier U1 and an analog switch U2. The output end of the operational amplifier U1 is connected to the selection end SEL of the analog switch U2. The B0 channel of the analog switch U2 is set to be suspended, and the B1 channel is connected to the Internet of Things data acquisition terminal. The elevator mainboard provides a power supply voltage for the signal switching circuit, and the voltage input end of the signal switching circuit is connected in series with a resistor R1 for connection to the handheld operator. At the same time, the resistor R1 is connected to the non-inverting input end of the operational amplifier U1. The voltage divider resistors R2 and R3 are connected in series between the voltage input end and the ground end. The inverting input end of the operational amplifier U1 is connected between the voltage divider resistors R2 and R3.

2. The data acquisition terminal switching device according to claim 1, wherein: The signal switching circuit is integrated into the elevator mainboard interface J1.

3. The data acquisition terminal switching device according to claim 1, wherein: The elevator mainboard interface J1 is connected to the switch via the connector P1, and the switch is connected to the Internet of Things data acquisition terminal and the handheld operator respectively via the connector P2.

4. The data acquisition terminal switching device according to claim 1, wherein: An RC filter circuit is connected in parallel between the operational amplifier U1 and the VCC terminal of the analog switch U2.

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