波特率自适应RS485隔离中继器设计

Design of Baudrate Adaptive RS485 Isolating Repeater

针对传统RS485隔离中继器收发状态转换需要等待时间等问题,提出一种以单片机可编程计数器阵列为控制核心的波特率自适应RS485隔离中继器设计方案;分析了3种传统RS485隔离中继器的设计原理及其缺点,详细介绍了波特率自适应RS485隔离中继器的原理、计算波特率及字节实际发送时间的方法。实际应用表明,在通信波特率小于100kbit/s的条件下,该中继器数据传输稳定可靠,完全满足矿用产品的远程数据通信要求。

For the problem that traditional RS485 isolating repeater needs waiting time for state conversion of sending and receiving,the paper proposed a design scheme of baudrate adaptive RS485 isolating repeater with programmable counter array of single-chip microcomputer as control core.It analyzed design principles and disadvantages of three kinds of traditional RS485 isolating repeaters,and introduced principle,calculation of baudrate and actual byte sending time of the baudrate adaptive RS485 isolating repeater.The practical application shows that data transmission of the repeater is stable and reliable under the condition of communication baudrate less than 100 kbit/s and can meet requirements of remote communication of mine-used products.