| The working principle of LED Words and Graphics Display Screen is applying a monolithic-processor to control the luminous device of lattice group with ON/OFF, as result to display words and graphics. This paper is explaining bar LED Words and Graphics Display Screen. It is combined with several bar-screen, and be same display and control principle.In the old design, achieving the task of receiving dates and storaging dates only depend on the monolithic-precessor , the task of monolithic-precessor is so hard that the bar-screen can't be longer. Besides, applying the Scan Spot Method to acquire the matrix datas . Sending the dates to the controls by RS-232 Mode, such that the range is shortly, and the anti-jamming performance is no better.In this design, AT89C52 monolithic-processor is applied for central control, and latching the pairing datas in 74HC165. Applying GAL16V8 to be the time program controls and making use of the time clock feature to shift the data-series-exit out of I/O Port. By this way, the monolithic-processor will output 8 bits serial datas only in 2-3 machine cycles. The communication will be applied various mode in according with the real range, using the RS-232 Mode for shortcut-range or Rs-485 Mode for long-range. LED Bar-Screen can be communicated with PC , as a result with easy operation. In the communication, by means of MSComm control units of VB, the Chinese characters of upper computer will be sent to... |
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