一种调制解调器短消息服务控制策略

Control Strategy for Short Message Service in Modem

为保证调制解调器(Modem)长时间稳定运行,提出一种调制解调器短消息服务控制策略。设计基于串口DTR/RTS引脚的Modem断电重启电路,利用先入先出队列对Modem进行有序控制,通过期望应答值和超时策略实现对Modem异常状态的侦测。当Modem出现异常时,能将其断电重启,从而恢复功能。应用结果证明了该策略的有效性。

Considering actual applications of a Short Message Service（SMS） service,a specific circuit based on DTR/RTS is developed to reset Modem.To build a sequence of AT commands,A First-in First-out（FIFO） table where expectable response string from Modem and the maximum timeout are stored independently is built.The key procedures are presented,through which Modem can be re-powered on simultaneously after its errors are detected by the SMS service.