如何使用AT指令检测电话线忙 [英] How to use AT command to detect phone line is busy

问题描述

我有一个 USB 调制解调器.是否可以检测电话线是否占线?

I have a USB modem. Is it possible to detect the phone line is busy or not?

我想我可以使用 AT 命令来检测拨号音，但我不确定是否有任何命令支持.

I thought I could use AT Command to detect dial tone, but I'm not sure are there any commands support that.

谢谢.

推荐答案

我相信您必须像人类一样执行此操作...摘机并等待拨号音.

I believe you have to do this the same as a human would... take it off hook and wait for dial tone.

摘自 http://michaelgelis.tripod.com/modem.html

D 单独将调制解调器摘机并等待拨号音.(看X 命令用于异常).等待拨号音的时间长度拨号前可在寄存器 S6 中编程.

D alone will take the modem off-hook and wait for a dial tone. (see X command for exceptions). The length of time to wait for a dial tone before dialing is programmable in register S6.

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