RFID模块中另一个重要的部分是高频多通道读写器，本系统选用的是捷通的四通道高频读写器，该读写器能够一次识读200个标签，将该读写器装载物流车厢顶部即可，通过485总线的方式与控制器相连接。RFID模块的连接电路图如图4所示。

基于RFID、GPS、GPRS的物流追踪系统的研制

　　2.2 物流监管平台设计分析

　　物流监管平台主要是GPRS接收模块和服务器组成，GPRS模块将接收到的物流信息上传到服务器，服务器进行数据分析后存入数据库，同时服务器也可以接收到客户的访问需求，实时下发信心查询物流车和货物的动态信息。

　　3 软件设计

　　该系统的软件部分主要由上位机软件和车载物流终端两部分组成。在此详细介绍车载物流终端的软件设计。

　　物流车载终端设备在开机后进行初始化，初始化包括GPS初始化、GPRS初始化、RFID初始化3个部分，初始化正常后进入while循环等待上位机的中断请求，当上位机出现中断请求时，控制器采集GPS模块和RFID的数据，通过GPRS模块上传到上位机平台，上位机平台对采集来的数据进行分析处理，检查是否出现异常变动情况。当上位机没有中断请求时，车载中断控制器进行计时等待，等到规定时间后自动采集GPS模块的地理位置信息和RFID的标签信息，将采集到的信息上传到上位机平台。物流车载中断的主程序流程图如图5所示。

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