基于STM32F407的RS232通信代码

上传者: 53863426 | 上传时间: 2025-05-30 02:20:30 | 文件大小: 14.7MB | 文件类型: RAR
RS232是异步通信,全双工传输(异步通信就是无时钟CLK信号,全双工就是能同时收发数据)。采用负逻辑传送,规定逻辑“1”的电平为-5V~-15 V,逻辑“0”的电平为+5 V~+15 V。选用该电气标准的目的在于提高抗干扰能力,增大通信距离,但是在工业中传输距离只有15m,相对RS485来说较短,所以在工业中用RS232不常见。RS232常见的接口是DB9,一般都有专门的线进行连接。 工业上控制器常采用从MCU-光电耦合-电平转换-DB9接口的设计,如图所示,一般会在MCU和转换电平中加入光电耦合芯片,光耦的主要作用是实现信号的隔离,通过光耦隔离来实现信号的隔离传输,使电平转换芯片与MCU系统不共地,完全隔离则有效的抑制了高共模电压的产生,大大降低232的损坏率,提高了系统稳定性。电平转换主要是由于TTL信号不能直接被RS232标准传输协议直接识别从而需要改变他的电平标准。光电耦合芯片一般采用6N137、TLP2361等,电平转换一般采用MAX3232、SP3232芯片。

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