INTERPHASE CORP 4020-000 INAV4000 6U PICMG 2.16 GIGABIT ETHERNET CPCI NETWORK数据为5 2―直置为“0”，并使+，清零，则不论9位数据（+9 8）为何值，下位机均可产生串行接收中断，这样9位就可作为差错检测的奇偶校验位了。如上位机与某下位机通信时，发送地址码，待握手成功后再发送数据命令，此时该下位机的FLAG被置为“”，相当于该机的“口袋”已打开，上位机不断从该下位机中取数据，取完无误后发出命令使该下位机中的FLAG复原为“0”，实现“关口袋”。
下位机向上位机发送数据时，发送要传送数据的长度，然后才开始发送有效数据。
约定00H为取数命令，0FFH为复位命令，通信采用偶校验，波特率设为2400b/s.上面给出PC机主函数的流程图，如所示。PC机通信程序采用VC++6.0语言编写。下位单片机的通信模块，包括主程序和中断服务程序，其程序流程图分别如和所示。何实现上位机与相应发送地址相符的下位机之间通信呢，可采用软件方法。具体方法如下：在下位机程序中设立个标志变量FLAG，初始化时FLAG置为“0”，当上位机发送数据时，各下位机均会产生接收中断，中断服务程序判断本机FLAG的值。若FLAG为“0”，则把接收的数据与本机地址比较，如果，则置FLAG为6“，并发回本机地址码作为应答，否则马上跳出中断服务程序；如果FLAG是”“，说明上位机发送来的是控制命令，则转相应命令处理程序，后才跳出中断服务程序，返回主程序。上位机与该下位机通信完毕后，再令该下位机的FLAG为”0“。如果握手失败，则上位机发送复位命令给下位机，然后重新开始握手，三次都不成功则转出错处理。迈普公司作为中国专业数据通信厂商的民族品牌，20年专注于党政、运营商、金融、工等行业的网络通信领域。作为国内民族企业自主可控的领锋，不遗余力研发自主可控的网络和安全产品，采用龙芯2H芯片开发了NSS4320系列自主可控安全交换机于204年2月上市发布，在各个领域得到速的应用。
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