说明：  基于51单片机的DSM-301射频模块测试程序.远距离电子标签被广泛应用在人员、车辆、资产的智能化识别、定位、跟踪、监控和管理。在校园、医院、矿井、敬老院、监狱、停车场、物流、景区、动物园等场合有着成熟的应用。 DSM-301电子标签识别模块工作在2.4GHz-2.45GHz微波段，内置天线，内置信号衰减控制器，可有效识别1—50米范围内的电子标签。 DSM-301模块内置信号衰减控制模块，可有效控制读卡的距离，识别距离精度可达1米以内
(51 microcontroller-based RF module DSM-301 test program. Distance RFID is widely used in personnel, vehicles, assets intelligent identification, positioning, tracking, monitoring and management. Campus, hospitals, mines, nursing homes, prisons, car parks, logistics, resorts, zoos and other occasions has a mature application. DSM-301 to electronically identify the module in a microwave band 2.4GHz-2.45GHz, built-in antenna, the built-in signal attenuation controller, can effectively read barcode within 1-50 m range. DSM-301 module built-in signal attenuation control module, which can effectively control the distance between the reader, the recognition accuracy of up to 1 meter distance within)