Weighing Display Controller With Digital Sensor

This paper describes the advantages of weighing display controller with digital sensor. Taking two kinds of digital truck scale xk3190-ds1 and xk3190-ds2 as examples, the paper introduces the function and usage of the digital weighing display controller. Finally, the common misunderstanding of users of digital weighing instrument is clarified

The development of electronic weighing display controller has been developing to now. The general trend is miniaturization, modularization, digitization, intelligence and networking, which has changed from single function to multiple functions. Many functions that must be completed by computer can now be completed by weighing display instrument alone. Weighing display controller is not only "scale", The function also far exceeds the category of "display". In a wide range of weighing displays, the digital sensor weighing display controller (hereinafter referred to as digital instrument) is a new favorite in the market

The full name of digital sensor shall be digital intelligent weighing sensor, and its research and development work starts in the mid-1990s. Several major companies in the United States and Germany combine modern electronic technology, micro-processing technology and digital compensation technology with traditional strain type weighing sensor, The digital sensor is characterized by strong anti-interference capability, long signal transmission distance, low requirements for symmetrical display control instruments, convenient adjustment of parallel group scale, etc. in addition, with the popularity of electronic scales, cheating behaviors of using electronic scales in commodity transactions are increasing. The signals output from analog sensors are easily changed by some illegal merchants by remote control, People have a great discount on the trust degree of electronic scales. Digital sensor outputs digital signals. Cheating by using sensor signals is very difficult, which effectively prevents this behavior. In a sense, a digital sensor is equivalent to a weighing display controller, which only turns the content that needs to display the output into communication output, The direct weight output is changed into ad code (internal code) output proportional to the weight

From the above introduction, it can be seen that digital sensors can be connected to the computer completely. The weight can be calculated by computer and displayed, stored, printed, transmitted and other works. That is, virtual instruments designed by computer software can be separated from actual instruments. In fact, some manufacturers do, but the limitations of this are also very obvious

First, the computer has poor mobility and protection. The computer requires high requirements for use occasions, and is not adaptable to harsh environments such as vibration, humidity, dust, etc. the computer also requires high quality requirements for operators. It is necessary to avoid the operator from illegal operation on this computer, causing a machine crash or computer being infected with virus, causing system paralysis, The modification of computer software is very convenient, which provides convenience for illegal users to cheat, and also loses the advantages of anti cheating of digital sensors. Therefore, the technical supervision departments in some regions refuse to verify the weighing system composed of computer and digital sensor

Third, the price of the computer is much higher than that of the weighing display controller. In addition to the very complex functions, the cost performance of the instrument used is higher than that of the computer

Finally, the computer starts for a long time, and it often takes several minutes to run from the start-up to the weighing software, which does not meet the requirements available after startup

Computer can not replace instrument completely, which is a fact that many people see. Therefore, there are more and more companies developing instruments for digital sensors. Yaohua company has developed two digital weighing display controllers in this background, namely xk3190-ds1 and xk3190-ds2

Xk3190-ds1 is a digital instrument with segment display. At present, it can be connected with the digital sensor of HBM company and only one company, and can connect up to 16 sensors. At present, the number of digital sensors in the market is increasing gradually, and the communication protocol is also all walks of life. We choose these two sensors because they are relatively mature in technology and reliable in use, In addition, the sensor manufacturer shall disclose its communication protocol. The inconsistency of communication protocol is a factor that restricts the use of digital sensor. At present, relevant organizations are brewing a unified digital sensor communication protocol. I think, as long as the most basic part of the protocol is unified, The popularity of digital instruments will be improved a lot. We hope that more reliable digital sensors will be available, and our digital weighing display controller will also increase support for this kind of sensor

Xk3190-ds1 inherits the function of another analog instrument xk3190-d10 from a weighing instrument manufacturer in Shanghai, but it is different due to the use of digital sensor. It adds some settings related to the sensor, such as setting sensor type, number, address, etc. it can also scan the type, number and address of sensor automatically, The internal code of the sensor can be viewed to judge the stress condition of each sensor

Xk3190-ds1 provides two adjustment modes of angular difference, namely manual and automatic. As anyone who knows the scale of automobile, traditional analog instrument adjusts the angle difference by adjusting the resistance in the junction box. The adjustment process requires rich experience and certain limits in the adjustment range. It often needs to be repeated to achieve better results, It is a very trivial work. The four corner adjustment of digital weighing instrument is much simpler, and there is no adjustable parts in its junction box. Generally, it only connects all sensors to the bus led from the instrument. The instrument multiplies the internal code data transmitted by it by different coefficients according to the different address of the sensor, and then adds it to correct the angle difference, The process of calculating angular difference is angle difference adjustment. Manual adjustment is to measure the internal code change of each sensor when the weight is placed in different positions of the scale table to calculate the corresponding coefficient of each sensor manually, and then input the instrument. The automatic method only needs to place weights at different positions of the scale table according to the instrument instructions, The instrument will automatically complete the calculation of coefficient. Generally, the angle difference adjustment can be completed only by automatic method. The function of manual method is: on the one hand, in the case of severe environment (such as outdoor wind), the adjustment coefficient can be adjusted slightly according to experience and then input manually; On the other hand, when replacing the instrument, the angle difference coefficient of the replaced instrument can be input directly in the new instrument, without the need for the adjustment of the angular difference again

Xk3190-ds1 has a special function for digital weighing instrument, namely track scale function. Analog instrument does not distinguish which sensor signals are sent from, and angle difference adjustment is completed by adjusting resistance in junction box. When digital instrument is used as track scale, sensor must be grouped, and it is considered that two digital sensors of the same group have the same adjustment coefficient, This will enable adjustment of angular difference. Xk3190-ds1 has such functions

The digital sensor supported by xk3190-ds2 is the same as xk3190-ds1, but it is a new technology. The core of this instrument is not 51 series single chip microcomputer, but ARM chip, which has fast operation and processing speed. The display adopts point array VFD or dot matrix LCD, which can display more direct and rich information. The power supply adopts switch power supply, with voltage ranging from 110V to 220V, The power frequency can work from 50Hz to 60Hz, which can effectively solve the problem of unstable voltage of power grid, and also solve the problem of excessive heating of linear power supply. It is very suitable from the perspective of energy saving. In addition, switching power supply has a good inhibition effect on interference from power line, and is suitable for occasions with large interference

Xk3190-ds2 adheres to the consistent style and usage habit of Yaohua automobile weighing instrument. It is very friendly for customers familiar with Yaohua instrument, and the functions of communication, large screen, printing and record storage remain unchanged. More importantly, the instrument has added functions related to Chinese characters

First, xk3190-ds2 provides a full Chinese character interface. Even customers who have not used Yaohua instrument can easily master their operation. For each operation step, there are Chinese character information prompts, including what users should input, how large the input range is, whether the data input is legal, whether the instrument or sensor has any fault and what kind of fault

Secondly, xk3190-ds2 provides convenient input function of Chinese characters, which can input the vehicle number, goods number and company name of Chinese characters. The Chinese character input method adopts Pinyin input, and users who understand pinyin can master it without learning. Besides, besides inputting Chinese characters, they can also input upper and lower case letters, punctuation symbols and numbers, and can enter these contents in a mixed way

Thirdly, xk3190-ds2 provides a quick way to call the vehicle number and goods number. Each vehicle number or item number entered by the user automatically generates a three digit shortcut code. The next call only needs to enter the shortcut code of the vehicle number or goods number to call the vehicle number or the goods number, so as to avoid inputting Chinese characters every time it is called. The user can print out the list of vehicle number and goods number, All the shortcut codes for storing the vehicle number and the item number are listed above

In addition, all Chinese characters can be output in communication and printing. If the upper computer sends the instruction of reading the vehicle number or the goods number to the instrument, the instrument will transmit the vehicle number or goods number data including Chinese characters to the upper computer. In the printing aspect, the record information including the company name, vehicle number and goods number can be printed out in cooperation with the designated Chinese character printer

Xk3190-ds2 also provides the function of adjusting display contrast (LCD display) or display brightness (VFD display). Other functions, such as search sensor, angle difference adjustment, instrument replacement, do not need to recalibrate (only input sensor coefficient, zero ad code and calibration rate) are the same as xk3190-ds1

There are two misunderstandings about digital weighing display controller and digital sensor

One mistake is that the use of digital instruments does not need to calibrate the scale table. In fact, whether it is an analog sensor or a digital sensor, the most basic is that strain type sensors convert the signal of force into electrical signals. We know that if the force bias applied to the sensor is biased, even if only one sensor is used, the angle difference problem will occur. Therefore, the installation of the scale platform must be done, Avoid lateral force on the sensor or insufficient contact between the sensor and the scale table

Another mistake is that the output data of digital sensor is equal to the actual weight. There is a calibration problem for digital sensor itself. Calibration can be carried out before connecting to the scale table (generally, calibration is completed in the sensor manufacturer). If the internal code of sensor output after calibration is close to the weight and the effective number is very small, It is very unfavorable for the calculation inside the instrument. Because the end data of the code in the sensor has rounding error, and there will be errors in the calculation process inside the instrument, which makes the accuracy of the sensor discount. Therefore, if the user needs to recalibrate the sensor, the full scale can be marked as a million codes, and the error introduced in the calculation can be minimized

We believe that in the use of sensors (such as car scale, track scale, etc.), the advantages of using digital sensors are obvious, and the promotion of digital weighing display controller is very space.

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