使用 C# 写入后读取串行回复
在C#中发送命令后是否可以立即从串口读取回复？我有一个步进电机驱动器，正在尝试读取当前步数并将其显示在带有 .net Framework 4.0 的 C# Windows 窗体程序的状态栏中。为此，我需要发送“RC”命令。然后司机发回号码。我的问题是：写入串口后如何立即读取串口回复？对此的任何帮助都会非常有帮助！
Is it possible to read the reply from a serial port right after sending a command in C#? I have a stepper motor driver and am trying to read the current step number and display it in the status bar of my C# Windows form program with the .net framework 4.0. To do this I need to send the "RC" command. The driver then sends back the number. My question is this: How do you read the serial reply immediately after writing to the serial port? Any help with this would be very helpful!
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是的，调用
ReadLine()。然而有一个问题，串行端口非常慢。常见的波特率设置为 9600 波特，每个字符需要一毫秒才能接收。假设您返回 6 位数字，您正在查看 RC + lf + 000000 + lf + 控制器开销毫秒。你的程序至少有 10 毫秒的时间没有任何反应。相当于大约2000万个CPU周期。
这是否是一个真正的问题完全取决于您的应用程序需要多少个 CPU 周期。您可以通过使用线程来解决这个问题，可以显式地使用一个除了与控制器通信之外什么也不做的线程，或者使用 DataReceived 事件。
Yes, call
ReadLine().There's an issue however, serial ports are glacially slow. A common baudrate setting is 9600 baud, each character takes one millisecond to get received. Say you get 6 digits back, you're looking at RC + lf + 000000 + lf + controller overhead milliseconds. Your program is dead to the world for at least 10 milliseconds. The equivalent of about 20 million cpu cycles.
Whether that's a real problem entirely depends on how many cpu cycles you need in your app. You solve it by using threading, either explicitly with a thread that does nothing but talking to the controller or by using the DataReceived event.
您可能想要使用 ReadExisting 方法，其中包括流和缓冲区的组合。在不了解具体情况的情况下，我强烈建议您在此处查看 MSDN 文档
SerialPort 类 (系统.IO.端口）
You will probably want to use the ReadExisting Method which includes a combo of stream and buffer. Without knowing specifics I highly recommend checking MSDN docs here
SerialPort Class (System.IO.Ports)