从Linux命令行写入串行端口
在 Windows 中，我可以使用以下命令与串行端口设备进行通信：
mode com1: baud=9600 data=8 parity=n stop=1
copy con com1
alt+18alt+2ctrl+z
设备启动请求的操作。
当我尝试从独立的 Debian 盒子或 Debian < 完成相同的操作时a href="https://en.wikipedia.org/wiki/VirtualBox" rel="nofollow noreferrer">VirtualBox 同一台 Windows 机器的实例，到目前为止我还没有运气。
以下是等效的 Linux 命令（至少我是这么认为）：
stty -F /dev/ttyS0 speed 9600 cs8 -cstopb -parenb
echo '\x12\x02' > /dev/ttyS0
没有任何反应。
我该怎么做呢？
From Windows I can communicate with a serial port device using the following commands:
mode com1: baud=9600 data=8 parity=n stop=1
copy con com1
alt+18alt+2ctrl+z
The device starts the requested operation.
When I try to accomplish the same operation from a stand-alone Debian box or from a Debian VirtualBox instance of the same Windows machine, I had no luck so far.
Here are equivalent Linux commands (at least I think so):
stty -F /dev/ttyS0 speed 9600 cs8 -cstopb -parenb
echo '\x12\x02' > /dev/ttyS0
Nothing happens.
How can I do it?
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（3）
如果要使用十六进制代码，则应添加
-e选项以启用 echo 解释反斜杠转义（但结果与echo相同Ctrl + R、Ctrl + B）。正如 wallyk 所说 ，您可能需要添加-n以防止输出换行符：还要确保
/dev/ttyS0是您想要的端口。If you want to use hexadecimal codes, you should add the
-eoption to enable interpretation of backslash escapes by echo (but the result is the same as withechoCtrl + R,Ctrl + B). And as wallyk said, you probably want to add-nto prevent the output of a newline:Also make sure that
/dev/ttyS0is the port you want.不会被解释，并且会按字面意思将字符串
\x12\x02（并附加换行符）写入指定的串行端口。相反，您可以通过键入 CtrlVCtrlR 和 Ctrl< 在命令行上构建它/kbd>VCtrlB。或者使用编辑器输入脚本文件更容易。
stty 命令应该可以工作，除非有其他程序干扰。常见的罪魁祸首是
gpsd，它会查找插入的 GPS 设备。will not be interpreted, and will literally write the string
\x12\x02(and append a newline) to the specified serial port. Instead usewhich you can construct on the command line by typing CtrlVCtrlR and CtrlVCtrlB. Or it is easier to use an editor to type into a script file.
The
sttycommand should work, unless another program is interfering. A common culprit isgpsdwhich looks for GPS devices being plugged in.使用Screen：
注意：Screen实际上无法发送十六进制， 据我所知。为此，请使用
echo或printf。我使用本文中的建议写入串行端口，然后使用 另一篇文章从端口读取，结果好坏参半。我发现使用 Screen 是一个“更简单”的解决方案，因为它直接与该端口打开终端会话。 （我把更容易的放在引号中，因为 Screen 有一个非常奇怪的界面，IMO，需要进一步阅读才能弄清楚。）
您可以发出此命令来打开 screen 会话，然后您输入的任何内容都将被发送到端口，加上返回值将打印在它下面：（
更改上面的内容以满足您对速度、奇偶校验、停止位等的需求）我意识到 Screen 不是帖子特别要求的“Linux 命令行”，但是我认为这也是本着同样的精神。另外，您不必每次都键入 echo 和引号。
echo
它遵循praetorian droid的答案。 但是，这对我不起作用，直到我也使用cat 命令（
cat ）当我发送echo命令时。printf
我发现还可以使用 printf 的 '%x' 命令：
同样，对于 printf，start
catcat < /dev/ttyS0在发送命令之前。Using Screen:
Note: Screen is actually not able to send hexadecimal, as far as I know. To do that, use
echoorprintf.I was using the suggestions in this post to write to a serial port, and then using the information from another post to read from the port, with mixed results. I found that using Screen is an "easier" solution, since it opens a terminal session directly with that port. (I put easier in quotes, because Screen has a really weird interface, IMO, and takes some further reading to figure it out.)
You can issue this command to open a screen session, and then anything you type will be sent to the port, plus the return values will be printed below it:
(Change the above to fit your needs for speed, parity, stop bits, etc.) I realize Screen isn't the "Linux command line" as the post specifically asks for, but I think it's in the same spirit. Plus, you don't have to type echo and quotes every time.
echo
It follows praetorian droid's answer. However, this didn't work for me until I also used the cat command (
cat < /dev/ttyS0) while I was sending the echo command.printf
I found that one can also use printf's '%x' command:
Again, for printf, start
cat < /dev/ttyS0before sending the command.