Calibration tool and system based on RS485 communication

Abstract

The utility model provides a calibration tool and system based on RS485 communication, the calibration tool is provided with a plurality of TTL-RS485 modules, and each TTL-RS485 module is independently connected with an external TTL device; and each of the TTL-RS485 modules is connected to an internal RS485 bus. The problems of distance limitation, weak anti-interference and no support for simultaneous communication of multiple devices in the batch calibration and detection process of a traditional TTL product are effectively solved, the working efficiency is remarkably improved, and the operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor product testing, in particular to a calibration tool and system based on RS485 communication. Background Art

[0002] In the current electronic products and industrial control fields, TTL (Transistor-Transistor Logic) output interface is widely used in internal logic control and short-distance data transmission of various devices due to its high speed and low cost.

[0003] For systems involving multiple TTL output products, each TTL product can only be calibrated and tested individually, which not only significantly increases the complexity of the implementation project, but also greatly increases the labor cost and time cost. The staff must connect, test and calibrate each TTL product one by one, which will undoubtedly become a major bottleneck in efficiency and resource management in the case of large-scale deployment or frequent maintenance. Utility Model Content

[0004] Based on the above content, the utility model provides a calibration tool and system based on RS485 communication, which only solves the technical problems of high cost and low efficiency in the prior art for separate calibration and testing of TTL devices.

[0005] A calibration tool based on RS485 communication, having a plurality of TTL-RS485 modules, each TTL-RS485 module is independently connected to an external TTL device;

[0006] Each TTL-RS485 module is connected to an internal RS485 bus.

[0007] Furthermore, each TTL-RS485 module is independently connected to a power module, and each power module is connected to an internal RS485 bus.

[0008] Furthermore, the TTL-RS485 module uses a half-duplex RS485 chip.

[0009] Furthermore, each TTL-RS485 module is also independently connected to a logic chip.

[0010] Furthermore, a first connector connected to the TTL-RS485 module in a one-to-one correspondence is provided on the first side of the calibration tool, and the TTL-RS485 module is connected to an external TTL device through the first connector.

[0011] Further, first connectors connected to the TTL-RS485 modules in a one-to-one correspondence are provided on the first side and the second side of the calibration tool;

[0012] The first side surface is opposite to the second side surface.

[0013] Furthermore, a second connector is provided on both the third side surface and the fourth side surface of the calibration tool;

[0014] The second connector is connected to the internal RS485 bus;

[0015] The third side surface is opposite to the fourth side surface.

[0016] Furthermore, the calibration tool has 32 TTL-RS485 modules inside, and 16 first connectors are respectively provided on the first side and the second side.

[0017] A calibration system based on RS485 communication, characterized by comprising at least two of the aforementioned calibration tools based on RS485 communication;

[0018] The third side surface and the fourth side surface of the calibration tool are both provided with a second connector, and the second connector of each calibration tool is connected to the internal RS485 bus;

[0019] The third side and the fourth side of each calibration tool are opposite to each other;

[0020] The calibration tools are arranged in sequence, and the second connector on the fourth side of the previous calibration tool is connected to the second connector on the third side of the next calibration tool via an external RS485 bus;

[0021] The second connector on the third side of the first calibration tool is connected to the host computer via the RS485 bus.

[0022] The beneficial technical effect of the utility model is that multiple independent TTL-RS485 modules are integrated inside the tooling, each module is connected to the RS485 bus, and the RS485 bus realizes the communication between multiple TTL products and the host computer, which effectively solves the problems of distance limitation, weak anti-interference and lack of support for simultaneous communication of multiple devices in the batch calibration and testing process of traditional TTL products, significantly improves work efficiency and reduces operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the circuit structure inside a calibration tool based on RS485 communication of the utility model;

[0024] Figure 2 The utility model is a schematic diagram of the arrangement structure of the first connector on the first side of the calibration tooling based on RS485 communication.

[0025] in,

[0026] 1-TTL-RS485 conversion module;

[0027] 2-RS485 bus;

[0028] 3-TTL devices;

[0029] 4-First connector. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0033] See also Figure 1-2 The utility model provides a calibration tool based on RS485 communication, which has a plurality of TTL-RS485 modules (1), each TTL-RS485 module (1) is independently connected to an external TTL device (3);

[0034] Each TTL-RS485 module (1) is connected to an internal RS485 bus (2).

[0035] Furthermore, the TTL-RS485 module (1) is an RS485 chip. The TTL-RS485 module (1) converts the TTL signal of the TTL device (3) into an RS485 signal.

[0036] The TTL device is connected to the RS485 chip on the tooling through the TTL level of the serial port, that is, the TX and RX pins. The internal RS485 bus (2) on the tooling is connected to the computer through a USB to RS485 communication line for data exchange.

[0037] In order to improve the calibration efficiency of TTL devices and identify the specific circumstances of TTL device calibration, the calibration tooling exchanges data with the computer host software through the RS485 bus to write, store, analyze and identify the calibration data, which can greatly shorten the time for manual calibration of products, thereby reducing labor costs and improving product calibration efficiency.

[0038] By integrating multiple independent TTL-RS485 modules (1) inside the tooling, each module is connected to the RS485 bus, and the RS485 bus enables communication between multiple TTL products and the host computer, effectively solving the problems of distance limitation, weak anti-interference and lack of support for simultaneous communication of multiple devices in the batch calibration and testing process of traditional TTL products, significantly improving work efficiency and reducing operating costs.

[0039] Furthermore, each TTL-RS485 module (1) is independently connected to a power module (not shown in the figure), and each power module is connected to the internal RS485 bus (2).

[0040] The internal RS485 bus (2) includes a power line, which provides external power to each power module. The power module steps down and stabilizes the voltage to a certain voltage, such as 5V, and supplies power to each independent TLL to RS485 module, and stabilizes the voltage for each connected TLL device. Each independent power module has independent protection functions, such as overvoltage, current limiting, static electricity, anti-interference, etc., and supports functions such as wide range 9-24V power supply. If one circuit is damaged, it will not affect the normal operation of other circuits.

[0041] Furthermore, the TTL-RS485 module (1) uses a half-duplex RS485 chip.

[0042] A tool can have a total of 32 channels, each channel has independent power supply and independent communication, and uses a half-duplex RS485 chip.

[0043] Furthermore, each TTL-RS485 module (1) is also independently connected to a logic chip (not shown in the figure).

[0044] Furthermore, a first connector (4) connected to the TTL-RS485 module (1) in a one-to-one correspondence is provided on the first side of the calibration tool, and the TTL-RS485 module is connected to the external TTL device (3) via the first connector (4).

[0045] Furthermore, first connectors (4) connected to the TTL-RS485 modules (1) in a one-to-one correspondence are provided on the first side and the second side of the calibration tool;

[0046] The first side surface is opposite to the second side surface.

[0047] Furthermore, a second connector (not shown in the figure) is provided on both the third side surface and the fourth side surface of the calibration tool;

[0048] The second connector is connected to the internal RS485 bus (2);

[0049] The third side surface is opposite to the fourth side surface.

[0050] The traditional RS485 chip communication requires three IO ports. The utility model reduces one IO port by connecting one of the TTL-RS485 modules to the logic chip using the TX port, and then connecting the output terminal to the RS485 control pin, that is, only two communication lines, TX and RX, are needed, and the control line is controlled by the TX through the logic chip, reducing one IO port resource. Only two IO ports are used, which reduces the precious single-chip computer resources, and the calibration tool has a reserved bus output port, i.e., two second connectors, so that multiple calibration tools can be used in series, so that the calibration tools can be combined to calibrate more TTL devices, and up to 255 can be mounted for calibration and retesting.

[0051] Furthermore, the calibration tool has 32 TTL-RS485 modules (1) inside, and 16 first connectors (4) are respectively arranged on the first side and the second side.

[0052] By making a 32-channel digital calibration tool, 32 TTL products can be calibrated and tested in batches, which can greatly shorten the time for manual calibration of products, thereby reducing labor costs and improving product calibration efficiency.

[0053] The utility model also provides a calibration system based on RS485 communication, comprising at least two of the aforementioned calibration tools based on RS485 communication;

[0054] The third side surface and the fourth side surface of the calibration tool are both provided with a second connector, and the second connector of each calibration tool is connected to the internal RS485 bus (2);

[0055] The third side and the fourth side of each calibration tool are opposite to each other;

[0056] The calibration tools are arranged in sequence, and the second connector on the fourth side of the previous calibration tool is connected to the second connector on the third side of the next calibration tool via an external RS485 bus;

[0057] The second connector on the third side of the first calibration tool is connected to the host computer via the RS485 bus.

[0058] 255 TTL devices can be mounted on the RS485 bus connected to the host computer for calibration and testing, which can greatly reduce labor costs and time costs.

[0059] The software in the host computer writes the calibration data, temperature compensation data, and linear calibration data of each TTL device into the single-chip microcomputer of each TTL device product. The host computer software identifies, analyzes, determines, and stores the data on the computer hard disk. After the calibration is completed, retesting can be performed to detect the accuracy of the product.

[0060] It can be seen that the advantages of the utility model are:

[0061] It can batch calibrate multi-channel TTL products, such as 32-channel products;

[0062] It can perform batch retest on multi-channel TTL products, such as 32-channel products;

[0063] The communication line can be up to 1 km long;

[0064] Automatic calibration can be achieved;

[0065] Data is stored on the host computer hard disk and can be easily traced;

[0066] Multiple multi-channel calibration tools can be connected in series for calibration, and up to 255 TTL products can be calibrated in batches;

[0067] Improve product calibration efficiency.

[0068] The above are only preferred embodiments of the present invention, and do not limit the implementation mode and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A calibration tool based on RS485 communication, characterized in that: There are several TTL-RS485 modules, each of which is independently connected to an external TTL device; Each of the TTL-RS485 modules is connected to an internal RS485 bus.

2. A calibration tool based on RS485 communication as claimed in claim 1, characterized in that: Each of the TTL-RS485 modules is independently connected to a power module, and each of the power modules is connected to the internal RS485 bus.

3. A calibration tool based on RS485 communication as claimed in claim 1, characterized in that: The TTL-RS485 module adopts a half-duplex RS485 chip.

4. A calibration tool based on RS485 communication as claimed in claim 1, characterized in that: Each of the TTL-RS485 modules is also independently connected to a logic chip.

5. A calibration tool based on RS485 communication as claimed in claim 1, characterized in that: A first connector that is connected to the TTL-RS485 module in a one-to-one correspondence is provided on the first side of the calibration tool, and the TTL-RS485 module is connected to the external TTL device through the first connector.

6. A calibration tool based on RS485 communication as claimed in claim 5, characterized in that: The first connector connected to the TTL-RS485 module in a one-to-one correspondence is provided on both the first side and the second side of the calibration tool; The first side surface and the second side surface are opposite to each other.

7. A calibration tool based on RS485 communication as claimed in claim 6, characterized in that: A second connector is disposed on the third side and the fourth side of the calibration tool; The second connector is connected to the internal RS485 bus; The third side surface is opposite to the fourth side surface.

8. A calibration tool based on RS485 communication as claimed in claim 6, characterized in that: The calibration tool has 32 TTL-RS485 modules inside, and the first side and the second side are respectively provided with 16 of the first connectors.

9. A calibration system based on RS485 communication, characterized in that: Comprising at least two calibration tools based on RS485 communication as described in any one of claims 1 to 8; A second connector is disposed on the third side and the fourth side of the calibration tool, and the second connector of each calibration tool is connected to the internal RS485 bus; The third side surface and the fourth side surface of each calibration tool are opposite to each other; The calibration tools are arranged in sequence, and the second connector on the fourth side of the previous calibration tool is connected to the second connector on the third side of the next calibration tool via an external RS485 bus; The second connector on the third side of the first calibration tool is connected to the host computer via an RS485 bus.

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