需要安装spcom控件，提高串口4针和7针进行输出，可以模拟触发电平，启动或停止工业设备，如变频器的运行和停止。(Need to install SPCOM controls, increase the serial port 4 and 7 needles for output, can simulate the trigger level, start or stop industrial equipment, such as the operation and stop of the fr