RFID collection Weighing system based on computer programming software VB, through the computer serial port and Tolido electronic weighbridge communication, monitoring the obvious abnormal conditions in the weighing process, such as weighing table instability, data anomalies, smoke frame overreach, and real-time collection of Electronic scale weight information, according to the choice of automatic weight information storage or manual weight information storage. After the information is stored, the sound and light prompts are given. Finally, the weight information collected is statistically summarized and a report is formed to provide weight data for the quality traceability system of the bakery.

Weighing system adopts Tolido series electronic scale, the weighing instrument has a D-type 25-core serial port COM1 on the back, the upper computer is configured with a serial port card (including two 9-pin serial ports), one is connected to the weighing terminal, one is connected to the HSC08A serial port controller. The weighing terminal is connected to serial port 1 of the upper computer, in which 2,3,7 of the 25-pin serial port are respectively connected to 2,3,5 "of the 9-pin serial port. LED screen using Toledo special screen, external 220V power supply, signal line and weighing station 25-core serial port 3 and 7 connection, you can achieve the weight information display. The serial controller has 8 inputs and 8 outputs, the input end is connected to the RFID contact and out-of-bounds detection, and the output end is connected to 4 indicators and 4 sound contacts of the switching voice prompter.

Software The system software adopts VisualBasic6.0 development environment, and the basic parameters of the serial port of the weighing terminal and the serial port controller are set as "9600bps, n, 8,1" 4. The serial port data of the weighing terminal is selected as the continuous transmission mode, and the format is 18 bytes. The second to fourth bytes correspond to the status words SWA, SWB, and SWC respectively. In order to prevent overload and collect negative values, the second bit of the status word SWB should be read for detection. The 5th to 10th byte represents the gross weight value without decimals, and the 11th to 16th byte represents the tare value. Because each byte of data in the packet is set to 8 bits, the data value is within 0 to 128, and for the value within 0 to 128, just subtract 48(0 is 48 in ASCII code), so that the weight data can be extracted. The data frame format of the serial port controller is frame header, address, data, frame tail, check ", and the reading method is similar to that of the weighing terminal.

After starting the software and entering the user name, manually input the basic information of the original tobacco before weighing each batch of raw tobacco, such as manufacturer, grade, origin, shift, year, weighing personnel, etc., and select the weight storage method (manual storage, automatic storage, remote storage). Remote storage through RFID is easy to operate and has a small error rate. Click the Start reading electronic scale button to enter the weighing process.