【摘要】 针对智能安防报警系统要求高可靠性、抗干扰能力强、体积小、便于调试的特点,设计了一种基于CPLD的无线安防报警系统的发射模块电路;该模块充分利用CPLD内部的数字逻辑资源,对各控制模块电路采用分层设计;当发射模块接收到警情信号后,通过移位编码器把警情及报警点地址的双重信息转换为密勒码,经调制由TH7108发射芯片以915MHz的频率发射出去,发射端从而可以实现快速发射防区的警情地址及警情信号,实现了警情和报警点地址传输的间歇发射。更多还原

【Abstract】 Intelligent Security Alarm System requires high reliability, strongly anti-interference capability, small size and ease of debugging features, designed a CPLD-based the transmitter module circuit of wireless security alarm system. The module takes full advantage of the digital logic CPLD internal resources and adopts the way of layered circuit design. Receiving the police signals, the transmitter module converts the dual code address for Miller and modulates by TH7108 chip to launch at the 915 MHz frequency, so that transmitter can achieve rapid Police launched and realizes the intermittent transmission.更多还原