摘要： 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。

关键词: 调制解调器, 短消息服务, RS-232接口, 接口电路, 先入先出队列

Abstract: 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.

Key words: Modem, Short Message Service(SMS), RS-232 interface, interface circuit, First-in First-out(FIFO) queue

中图分类号: 

• TP23