晶体的真空调频设备控制VI，通过串口于西门子PLC的通信。实现现场测量参数返回、控制命令下达、动作参数下达PLC、显示测量结果。(I edit the vacuum device control program, the programming language is LABVIEW, thanks to the example of network gods. Upload this document, hoping to provide help for later generations.)