查找C＃GSM调制解调器端口 [英] Find gsm modem port in c#

问题描述

我要遍历可用的端口：找到
System.IO.Ports.SerialPort.GetPortNames（）
如果一个端口被GSM调制解调器。
的任何想法，请

I want to loop through the available ports: System.IO.Ports.SerialPort.GetPortNames() to find if a port is used by a gsm modem. Any idea please.

推荐答案

我在我的应用程序所做的一个类似的任务：

What I did in my application for one similar task:

1. 要检查调制解调器连接到特定的端口，您可以发送AT命令到这个端口。如果我们发现目前的COM端口调制解调器
   下面这个函数返回true：

1. To check that a modem is connected to particular port you can send AT command into this port. This function below returns true if we found a modem on the current COM port:

private bool CheckExistingModemOnComPort(SerialPort serialPort)
{
    if ((serialPort == null) || !serialPort.IsOpen)
        return false;

    // Commands for modem checking
    string[] modemCommands = new string[] { "AT",       // Check connected modem. After 'AT' command some modems autobaud their speed.
                                            "ATQ0" };   // Switch on confirmations
    serialPort.DtrEnable = true;    // Set Data Terminal Ready (DTR) signal 
    serialPort.RtsEnable = true;    // Set Request to Send (RTS) signal

    string answer = "";
    bool retOk = false;
    for (int rtsInd = 0; rtsInd < 2; rtsInd++)
    {
        foreach (string command in modemCommands)
        {
            serialPort.Write(command + serialPort.NewLine);
            retOk = false;
            answer = "";
            int timeout = (command == "AT") ? 10 : 20;

            // Waiting for response 1-2 sec
            for (int i = 0; i < timeout; i++)
            {
                Thread.Sleep(100);
                answer += serialPort.ReadExisting();
                if (answer.IndexOf("OK") >= 0)
                {
                    retOk = true;
                    break;
                }
            }
        }
        // If got responses, we found a modem
        if (retOk)
            return true;

        // Trying to execute the commands without RTS
        serialPort.RtsEnable = false;
    }
    return false;
}

在下一阶段，我们可以收集来自调制解调器的一些数据。
我用下面的命令：

On the next stage we can collect some data from the modem. I used the following commands:

• ATQ0 - 关于确认开关（接收对每个请求确定）


• ATE0 - 回声

开关
• ATI - 获得调制解调器细节


• ATI3 - 获得更多的调制解调器的详细信息（不是所有的调制解调器支持该命令）

• ATQ0 - switch on confirmations (receive OK on each request)
• ATE0 - switch on echo
• ATI - get modem details
• ATI3 - get extended modem details (not all modems supports this command)

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