Thermal Printer Control System
|School||Harbin Institute of Technology|
|Course||Control Science and Engineering|
|Keywords||Thermal Printer Constant energy control Inter-board communication DSP|
As information and communication technologies and rapid economic development , as the final output printer , its application has been involved in the circulation of commodities , transportation , industrial control and other fields. The traditional printer performance, functionality , and many other aspects of information management has been unable to meet the requirements of automation of the end product . Thermal printer has a print speed , low noise, high print quality , small size, simple structure , easy maintenance, high cost , etc., will be widely used in shopping malls , health care, telecommunications, postal services and other fields. This paper first introduces the principle of thermal printer , combined with the specific application OK to Freescale DSP chip as the master control program. Then on this basis, the hardware circuit design. Including the power supply module, communication module , stepper motor drive module , temperature and voltage acquisition module, overheat protection module. Which according to the characteristics of thermal printers , thermal protection in the use of software, hardware, two protection, improve system security. Secondly, in the hardware platform control system software design. Includes data reception, data processing, data transmission of three main modules . Data receiving primary means of communication in accordance with established communication with the host machine to achieve ; mainly for data processing commands , curves , text, three different data be handled accordingly . Where the curve interpolation function was added to the data processing , a good solution to frequency matching problem, reduce the burden on the host computer ; data transmission process prints the effective compensation , combined with hardware circuit voltage compensation , temperature compensation, speed compensation as well as historical controls , and ultimately achieve \Finally, the master chip to achieve effective communication with the host computer . The printer supports print communication protocol commonly used in the market , offering two different serial and parallel data communication mode. Data communication mode is simple and effective . This design is suitable for multi-parameter monitors , ECG machines, fetal monitors , blood cell analyzers and other medical equipment, POS terminals can also be used for high-speed thermal printing and other occasions .