...................203.2.3坐标显示系统........................................................................................................213.2.4电机控制系统........................................................................................................223.2.5声光报警系统........................................................................................................24第4章软件系统设计......................................................................................................264.1金属检测软件系统设计............................................................................................274.2步进电机控制系统软件设计....................................................................................274.3坐标显示系统软件设计............................................................................................28