2、如果信号灯在没有触摸时，仍然处于常亮状态，首先检查触摸屏是否需要清洁；其次检查硬件所连接的串口号与软件所设置的串口号是否相符，以及计算机主机的串口是否正常工作。
3、运行驱动盘中的COMDUMP命令，该命令为DOS下命令，运行时在COMDUMP后面加上空格及串口的代号1或2，并触摸屏幕，看是否有数据滚出。
有数据滚出则硬件连接正常，请检查软件的设置是否正确，是否与其他硬件设备发生冲突。
如没有数据滚出则硬件出现故障，具体故障点待定。
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