Weighing Display Controller With Digital Sensor

This paper describes the advantages of the weighing display controller with digital sensors, and takes two kinds of digital truck scales XK3190-DS1 and XK3190-DS2 launched by a Shanghai weighing company as examples, briefly introduces the functions and use methods of the digital weighing display controller.Finally, the common misunderstanding of users of digital weighing instrument is clarified.

Electronic weighing display controller development up to now, the general development trend is miniaturization, modularization, digitalization, intelligence and networking, from a single function into a variety of functions.In the past, many functions that must be completed by computer can now be completed by the weighing display instrument alone. The weighing display controller is not only a "scale", but also far beyond the scope of "display".Among various kinds of weighing display, digital sensor weighing display controller (hereinafter referred to as digital instrument) is the new favorite in the market.

The full name of digital sensor should be digital intelligent weighing sensor, its research and development began in the mid-1990s.Several large companies in the United States and Germany combined modern electronic technology, microprocessing technology, digital compensation technology and traditional strain type weighing sensor to invent the digital sensor.Its characteristics are strong anti-interference ability, long signal transmission distance, the corresponding requirements of the weighing display control instrument is low, and the combined balance is easy to adjust, etc.In addition, with the popularity of electronic scale, the use of electronic scale cheating behavior in commodity trading is more and more, the signal output from the analog sensor is easy to be changed by some illegal businessmen using remote control method, people's trust in electronic scale is greatly reduced.Digital sensor output is a digital signal, the use of sensor signal cheating behavior is very difficult, so as to effectively prevent this behavior.In a sense, a digital sensor is equivalent to a weighing display controller, but the original need to display the output of the content into a communication output, the direct weight output into the weight proportional to the AD code (internal code) output.

From the above introduction, we can see that the digital sensor can only be connected with the computer, through the computer to calculate the weight and display, storage, printing, transmission and other work, that is to say, can be separated from the actual instrument, and the virtual instrument designed by computer software.In fact, some manufacturers do so, but the limitations of doing so are very obvious.

The first is the computer mobility and defensible poor.The computer has high requirements for the use occasion, and poor adaptability to the harsh environment such as vibration, humidity and dust.Computer to the quality of the operator requirements are relatively high, to avoid the operator on this computer for illegal operation caused by crash, or computer virus infection caused by system paralysis.Second, the modification of computer software is very convenient, which provides convenience for illegal users to cheat, but also lost the advantages of digital sensors to prevent cheating.As a result, technical supervision departments in some areas refuse to test weighing systems made up of computers and digital sensors.

Third, the price of the computer is much higher than the price of the weighing display controller.In addition to very complex functions, using meters is more cost-effective than using computers.

Finally, the startup time of the computer is relatively long, from the startup to the operation of the weighing software often needs a few minutes, which does not meet the requirements of the startup can be used.

The fact that the computer cannot completely replace the meter is widely seen by many people, so the number of companies developing meters for digital sensors is increasing.Under this background, Yew Wah Company developed two digital weighing display controllers, XK3190-DS1 and XK3190-DS2 respectively.

XK3190-DS1 is a digital meter with a dash display that can be connected to HBM and one company's digital sensors, up to 16 sensors.At present, the number of digital sensors on the market is increasing gradually, and the communication protocols are different. We choose these two sensors because they are relatively mature in technology and reliable in use. In addition, we must consider the disclosure of their communication protocols by sensor manufacturers.The use of digital sensors is restricted by the disunity of communication protocols. At present, relevant organizations are considering a unified communication protocol for digital sensors. 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 that our digital weight display controller will add support for these sensors.

XK3190-DS1 inherits the function of another analog instrument XK3190-D10 from a weighing instrument manufacturer in Shanghai, but it is different because of the digital sensor used.It adds some Settings related to sensors, such as setting sensor type, number, address, etc.You can also scan the type, number and address of the sensor automatically, and you can check the internal code of the sensor to judge the force of each sensor.

XK3190-DS1 provides two kinds of Angle adjustment mode, namely manual mode and automatic mode.People who know about the truck scale know that the traditional analog instrument is adjusted by adjusting the resistance in the junction box to adjust the Angle difference. The adjustment process needs rich experience, and the adjustment range also has certain limits. It often needs to be repeated many times to achieve better results.Digital weighing instrument the corners of adjustment is much simpler, its terminal box does not exist any adjustable parts, usually just put the sensor got on the bus from the instrument, instrument, according to a different address sensor it came some code data on different coefficient, and then add fixed Angle difference, and calculate the Angle difference Angle difference is the process of adjustment.Manual adjustment is to measure the internal code change of each sensor when the weight is placed at different positions of the scale platform to manually calculate the corresponding coefficient of each sensor, and then input the instrument.The automatic mode only needs to place weights in different positions according to the meter instructions, and the meter will automatically complete the calculation of the coefficient.Usually, the Angle adjustment can be completed only by automatic mode. The functions of manual mode are as follows: on the one hand, when the environment of automatic adjustment is relatively bad (such as outdoor wind), the adjustment coefficient can be fine-tuned according to experience and then manually input;On the other hand, the Angle difference coefficient of the replaced instrument can be directly entered into the new instrument when the instrument is replaced, without the need to re-adjust the Angle difference.

XK3190-DS1 has a special function for digital weighing instruments, that is, the function of track scale.The analog meter does not distinguish the signal from which sensor, and adjusts the Angle difference by adjusting the resistance in the junction box.When the digital instrument is used as the track scale, the sensors must be grouped, and the two digital sensors in the same group are considered to have the same adjustment coefficient, so as to complete the Angle adjustment work.XK3190-DS1 has such a function.

The XK3190-DS2 supports the same digital sensor as the XK3190-DS1, but with brand new technology.The core of this instrument is not 51 series microcontroller, but ARM chip, fast computing and processing speed.Display using dot matrix VFD or dot matrix LCD, can display more intuitive and rich information.Used the switching power supply, voltage from 110 v to 220 v, the power frequency from 50 hz to 60 hz can work, can effectively solve the problem of power grid voltage instability, but also solved the problem of the linear power supply excessive heat, from the standpoint of energy saving is very appropriate, in addition, switching power supply for the interference from the power cord has good inhibition, suitable for dryDisturbance larger occasion.

XK3190-DS2 has been adhering to the consistent style and usage habits of YW Wah's automobile weighing instruments, and is very friendly to customers who are familiar with YW Wah's instruments in use. The functions of communication, large screen, printing and record storage remain unchanged.More importantly, the instrument has added functions related to Chinese characters.[page]

First of all, the XK3190-DS2 provides an all-Chinese character interface that can be easily mastered by customers who have never used YW meters before.For each operation step, there is a Chinese message indicating what the user should enter, what the input range is, whether the input data is legitimate, whether the instrument or sensor is faulty and what kind of fault, etc.

Second,XK3190-DS2 provides convenient Chinese character input function, you can input Chinese car number, article number and company name.The Chinese character input method adopts pinyin input, and users who understand pinyin can master it almost without learning.In addition to Chinese characters, you can also type upper and lower case English letters, punctuation marks, and numbers, and you can type a mix of the two.

Third,XK3190-DS2 provides a fast vehicle number, article number call.Each vehicle number or article number entered by the user will automatically generate a three-digit shortcut code. The next call only needs to input the shortcut code of the vehicle number or article number to call the vehicle number or article number, so as to avoid entering Chinese characters each time.The user can print out a list of car and article numbers, which lists all the shortcut codes to store the car and article numbers.

In addition, in the communication and printing aspects can also output Chinese characters.If the upper computer sends instructions to the instrument to read the train number or article number, the instrument transmits the data of the train number or article number, which can include Chinese characters, to the upper computer.In the aspect of printing, the company name, car number and article number can be printed with the specified Chinese character printer.

XK3190-DS2 also provides the function of adjusting display contrast (LCD display) or display brightness (VFD display).Other functions, such as sensor search, Angle adjustment, meter replacement does not need to re-calibrate (just input sensor coefficient, zero AD code and standard rate) and other aspects are the same as XK3190-DS1.

About digital weighing display controller and digital sensor, users often have two misunderstandings.

One misconception is that digital meters do not require leveling of the scales.In fact, whether it is an analog sensor or a digital sensor, the most basic is that the strain sensor converts the force signal into an electrical signal. As we know, if the force bias applied to the sensor is applied, even if only one sensor is used, the Angle difference problem will be generated.Therefore, the installation of the scale must also be done to avoid the lateral force of the sensor or the insufficient contact between the sensor and the scale caused by insufficient force.

Another misconception is that the output of the digital sensor should be equal to the actual weight.Digital sensor itself has a calibration problem, can be calibrated before access to the scale platform (generally completed in the sensor manufacturer calibration).If the internal code output by the sensor after calibration is close to the weight and the effective number is very few, it is very disadvantageous to the internal calculation of the instrument.Because of the rounding error of the last bit data of the sensor code, and the error will also be generated in the calculation process of the instrument, so that the accuracy of the sensor is discounted.Therefore, we recommend that if the user needs to recalibrate the sensor, they can scale the full scale to 1 million yards to minimize the error introduced in the calculation.

We believe that in the use of sensors (such as truck scale, railway scale, etc.), the advantages of the use of digital sensors is obvious, the promotion of digital weighing display controller is a big space.

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