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MCS-51系列单片机的串行通讯采用EIA RS-232或RS-422标准线路。RS-232标准线路适用于15m以内的近距离通讯,RS-422标准线路可在5km范围内以300波特率进行数字通讯。当传输速度要求快时,则需要缩短通讯距离,以确保通讯可靠。本文介绍一种实用的非标准通讯接口电路,可实现5km内、低于2.4k波特率的数字通讯,它具有成本低、传输距离长、抗干扰能力强、调试方便等优点。工作原理及应用电路此通讯接口电路由发送和接收两部分组成(附图)。
The serial communication of MCS-51 series one-chip computer adopts EIA RS-232 or RS-422 standard line. The RS-232 standard line is suitable for close-range communication within 15m and the RS-422 standard line can communicate digitally at 300 baud within a 5km range. When the transmission speed is fast, you need to shorten the communication distance to ensure reliable communication. This article introduces a practical non-standard communication interface circuit can be achieved within 5km, 2.4k baud rate of digital communications, it has the advantages of low cost, long transmission distance, anti-interference ability, easy debugging. Working principle and application circuit The communication interface circuit consists of sending and receiving two parts (with photos).