vb与plc串口通信程序 另加串口监视精灵 CommMonitor 侦测、拦截、逆向分析串口通信协议, 是侦测RS232/422/485串行端口 的专业工具软件，是软硬件工程师的最佳助手。CommMonitor 能侦听、拦截、记录、分析 串行通信协议，让您对应用程序操作串行端口的过程和细节，让您及时的模拟被侦听程序 或设备的数据、控制流，提高工作效率。-vb plc serial communication program plus a serial port monitor

This program was designed as a utility tool to allow the user to send and recieve data from a serial com port while monitory the byte data. If a loopback ciruit is made on the com port(jumper send to recieve DB9 pins 2 & 3) a developer can also monit