论文部分内容阅读
文章介绍２８．８Ｋｂ／ｓ公用电话信道数据传输系统的硬件、软件设计。系统采用较独特的硬件设计，一方面能够在不挂机的情况下随时控制Ｍｏｄｅｍ从数据传输状态切换到ＡＴ命令状态，完成主控端对各终端的实时控制；另一方面也实现了数据和命令在同一通道内的传输，简化了电路的设计。系统还采用了中断接收的软件设计方法以提高ＣＰＵ工作效率。
This article describes the 28.8Kb / s public telephone channel data transmission system hardware and software design. System uses more unique hardware design, on the one hand can not control the case at any time from the data transfer mode to switch to the AT command state, complete the host control of the terminal real-time control; on the other hand also achieved data and command Transmission within the same channel simplifies circuit design. The system also uses the interrupt receiving software design methods to improve CPU efficiency.