針對傳統LED 顯示屏投資大、遠程控制功能差的缺點提出了基于電話網的遠程控制
方案，設計了一套遠程控制系統，通過該系統可隨時更新顯示內容。遠程通信采用串口通信方式，采用的是目前管理方便，運行成本較低的通過公共電話網絡進行遠程控制，通過公用電話網連接控制器實現對LED 顯示屏進行遠程控制和顯示內容的更新，從而實現計算機對每個顯示屏進行遠程控制并對顯示內容進行更新。在系統的硬件上增加了調制解調器和一塊全新設計專門用于連接調制解調器和LED 顯示屏的接口板。
關鍵詞： LED 顯示屏；公用電話網；顯示模塊；串口通信LED
Abstract：The traditional LED display system has lots of defaults such as high value and low
function of long-range controlling. Aiming at this, the subject about precept of long-range
controlling system based on public telephone network was given. The system can control the
display screen distantly and can refresh the content at any time. To realize the long-range
controlling we adopt serial communication. It’s a method based on public telephone network, which cost low at present. It add a modem and a connecting board that connect the modem and LED display screen.
Keywords：LED display screen ；Public telephone network；Display unit ；serial communication