摘要： 针对传统多线制系统的诸多弊病,提出了一种总线制火灾图像监控系统。开发了以CPLD为核心的终端监控板,实现总线通信与控制,并采用通信避障的手段,实现轮询方式与多主发送方式相结合的双监控模式,有效提高了串行总线的半双工通信效率,增强了系统的稳定性和可靠性。

关键词: RS485总线, 半双工通信, 总线避障, 多主发送

Abstract: This article presents a new bus-mode fire detecting system to avoid the disadvantages of the multi-line mode.In order to enhance the reliability and stability of the system,the poll mode and multi-master sending are applied in the system through a detection terminal board(DTB) based on CPLD.The DTB is designed for avoiding communication conflict and improving the efficiency of the half-duplex communication.

中图分类号: 

• TP277