The main functional modules of the coding system include user management module, file receiving module, one-dimensional bar code printing module, two-dimensional code identification function, code scanning gun detection function and bar code management function. Drawing lessons from the "one thing, one code" to be realized in the actual pharmaceutical production process, this paper simulates the functions of bar code information collection, bar code generation and correlation, machine vision identification and detection of two-dimensional code and final bar code management in the actual production process of weighing.

On-line coding and weighing system takes weighing technology as the core, two-dimensional code or RFID as the data carrier, and combines automatic identification and automatic control system to dynamically code and weigh the products in the packaging process, endow each product with a unique "ID card", and at the same time complete the binding of production factor information of products, and realize closed-loop data association at different levels such as single product, box and tray according to the packaging level, providing data for subsequent product weighing, tracking, flow control and interactive marketing.

The measurement and coding system runs through all links of the whole product industry chain. Through low-cost production line transformation, the product is given a unique identity code and bound with product information, and multi-level closed-loop association is carried out, such as single product-box-consignment data. Through weighing and PDA scanning code when warehousing, agent/distributor receiving code scanning, terminal store receiving code scanning, traceability/anti-counterfeiting scanning code after purchase by consumers, market inspectors scanning code and other behaviors, we can judge whether the products are in the process of goods smuggling. If there is any goods smuggling, the system will send early warning information to enterprise managers in time to facilitate timely market decision-making.

The core part of the coding weighing system, data acquisition and data association, is constructed according to the principle of finite automatic state machine, using the post-association mode, which can ensure that the product supervision code of weighing is completely consistent with the associated data uploaded to the electronic supervision network. According to the site and environment of each product production line, as well as the process and operation requirements of packaging and weighing, the collection and association of the supervision code of the products in the network, the mixed mode of automatic collection and manual collection (referred to as the automatic line mode).

Checkweigher classification device is based on the role of the control device issued by the sorting instructions, when the goods with the same sorting signal through the device, the device action, so that change the direction of operation in the conveyor weighing device into the other conveyor or into the sorting of the roadway. There are many kinds of sorting devices, generally there are several kinds of push-out type, floating type, inclined type and branch type, different devices for sorting goods packaging materials, packaging weight, the smoothness of the bottom surface of the packages and so on do not have exactly the same requirements.

The grading machine utilizes dynamic weighing technology to detect the weight of the product, and the application of different weight sensors can get different detection accuracy of the weight testing machine, which determines the detection accuracy and operational stability of the weight grading machine. The range range of the weight sensor determines the weighing weight and scale of the weight grading machine. Meanwhile, the precision of the weight sensor also affects the precision of the weight sorter.

Sorting machines can be integrated with various packaging production lines and conveyor systems, mainly used for on-line detection of whether the weight of the product is qualified or not, and whether there are missing parts in the package. Or according to the different weight of the items to be conveyed to the corresponding weight range area. Generally consists of control device, sorting device, conveying device and sorting roadway. The role of the control device is to identify, receive and process the sorting signal, according to the requirements of the sorting signal to instruct the sorting device, according to the variety of goods, according to the location of the goods delivered or according to the category of the owner of the goods for automatic classification.

RFID weighing system is an advanced wireless weighing technology. RFID weighing system can make many management realize wireless methods, and more commercial enterprises will implement the work of coding items one after another. In order to improve the operation efficiency, we should try not to change the current logistics storage mode, so we should use pallets as carriers, and adopting pallet identification can make storage management more convenient.

The electronic tag of RFID weighing system is installed near the front of the car frame, and the appropriate installation position is selected according to different structural characteristics of the car frame. At the same time, the frame is made of metal, and metal-resistant electronic tags are needed. In order to ensure that the electronic tag is not damaged during the use, storage and transportation of the frame, the structure of the frame itself is fully utilized to protect the electronic tag.