波特率自适应的RS485中继器设计

Design of RS485 Repeater with Baud Rate Self-adjusting

在RS485总线路上配置波特率自适应的中继器是完成串口通信线路扩展的有效方法。本文利用W77E58双串口单片机和MAX485芯片较好地实现了中继任务,并通过软件方式实现波特率的自适应调节。文章较为详细地介绍了RS485中继器的硬件构成、工作原理和软件设计。中继器试验运行良好,可靠性高,成本低,具有广阔的应用和推广前景。

It is an effective way to extend the serial communicating circuit by setting repeaters with baud rate self-adjusting on the RS485 bus. In this article, the relaying task is well realized by using the double-serial-port singlechip W77E58 and the electric level converting chip MAX485. The baud rate self-adjusting is carried out by software programs. The hardware structure, working principle and software design are described detailedly in this paper. The repeater ran well in the test, and it has high liability and low cost, which has a bright prospect of application and popularization.