摘要
在分析串口扩展原理及现有串口扩展方法的基础上,提出了一种用单片机作为扩展模块主控部分,将嵌入式多参数监护仪的串口由1个扩展为4个的双向透明设计方案。经验证,该方案通信可靠,波特率满足系统要求,对串口扩展及其他接口设计均有一定的启迪作用和实际参考价值。
Based on analyzing the principle and the current methods of COM extension, the present paper puts forward a design plan of COM extension ,in which one COM of multi-parameter monitor is extended to four COM by regarding MCU as the primary control part. It＇s testified that it communicates reliably ,satisfies the request of system baud rate, and there are some edificatory effect and referenced value in COM extension and other interface design.
关键词
串口扩展
双向
透明
多参数监护仪
COM extension
bidirectional
transparent
multi-parameter monitor
