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[Software Engineeringjiekoutongxin

Description: 一、 设计目的及所需设备: 了解PC机串行口的使用;所需设备为:PC机,RS232插座及连线; 二、串行口的有关硬件资料 1. 9芯RS-232C接口标准: (1) 引脚1:CD,载体检测; (2) 引脚2:RXD,接收数据; (3) 引脚3:TXD,发送数据; (4) 引脚4:DTR,终端准备好; (5) 引脚5:信号地; (6) 引脚6:DSR,MODEM准备好; (7) 引脚7:RTS,请求发送; (8) 引脚8:CTS,清除发送; (9) 引脚9:RI,响铃指示; -one, and designed the necessary equipment : Learn PC's serial port; Necessary equipment : PC, RS232 socket and connect; 2, the serial port hardware information 1. 9-RS-232C interface standards : (1) 1-2 1 : CD, carrier detection; (2) 1-2 2 : RXD, receiving data; (3) 1-2 3 : TXD. Send data; (4) 1-2 4 : DTR, terminal ready; (5) 1-2 5 : signal; (6) 1-2 6 : DSR, MODEM ready; (7) 1-2 7 : RTS, a request; (8) 1-2 8 : CTS, Send removals; (9) 1-2 9 : RI, ringing instructions;
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