从linux命令行写入串口
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writing to serial port from linux command line
提问by erin c
From windows I can communicate with a serial port device using following commands:
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
Device starts the requested operation.
设备启动请求的操作。
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.
当我尝试从独立的 debian box 或同一台 windows 机器的 debian virtualbox 实例完成相同的操作时，到目前为止我没有运气。
Here's equivalent linux commands(at least I think so)
这是等效的 linux 命令（至少我是这么认为的）
stty -F /dev/ttyS0 speed 9600 cs8 -cstopb -parenb
echo '\x12\x02' > /dev/ttyS0
Nothing happens.
没发生什么事。
Can somebody please direct me to the right direction?
有人可以指导我走向正确的方向吗？
采纳答案by wallyk
echo '\x12\x02'
will not be interpreted, and will literally write the string \x12\x02(and append a newline) to the specified serial port. Instead use
不会被解释，并且会将字符串\x12\x02（并附加换行符）逐字写入指定的串行端口。而是使用
echo -n ^R^B
which you can construct on the command line by typing CtrlVCtrlRand CtrlVCtrlB. Or it is easier to use an editor to type into a script file.
您可以通过键入CtrlVCtrlR和在命令行上构建它CtrlVCtrlB。或者更容易使用编辑器键入脚本文件。
The sttycommand should work, unless another program is interfering. A common culprit is gpsdwhich looks for GPS devices being plugged in.
该stty命令应该可以工作，除非另一个程序正在干扰。一个常见的罪魁祸首是gpsd寻找插入的 GPS 设备。
回答by praetorian droid
If you want to use hex codes, you should add -eoption to enable interpretation of backslash escapes by echo (but the result is the same as with echoCtrlRCtrlB). And as wallyk said, you probably want to add -nto prevent the output of a newline:
如果您想使用十六进制代码，您应该添加-e选项以通过 echo 启用反斜杠转义的解释（但结果与 with 相同echoCtrlRCtrlB）。正如 wallyk 所说，您可能想要添加-n以防止换行符的输出：
echo -en '\x12\x02' > /dev/ttyS0
Also make sure that /dev/ttyS0is the port you want.
还要确保这/dev/ttyS0是您想要的端口。
回答by MrUser
SCREEN:
屏幕：
NOTE: screen is actually not able to send hex, as far as I know. To do that, use echoor printf
注意：据我所知，屏幕实际上无法发送十六进制。为此，请使用echo或printf
I was using the suggestions in this post to write to a serial port, then using the info from another postto 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.)
我使用这篇文章中的建议写入串行端口，然后使用另一篇文章中的信息从端口读取，结果喜忧参半。我发现使用 screen 是一个“更简单”的解决方案，因为它直接使用该端口打开终端会话。（我用引号更容易，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。）
You can issue this command to open a screen session, then anything you type will be sent to the port, plus the return values will be printed below it:
您可以发出此命令来打开一个屏幕会话，然后您输入的任何内容都将发送到该端口，并且返回值将打印在其下方：
screen /dev/ttyS0 19200,cs8
(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.
（更改上述内容以适应您对速度、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”，但我认为它具有相同的精神。另外，您不必每次都输入 echo 和引号。
ECHO:
回声：
Follow praetorian droid's answer. HOWEVER, this didn't work for me until I also used the cat command (cat < /dev/ttyS0) whileI was sending the echo command.
按照 praetorian droid 的回答。然而，这并没有为我工作，直到我也使用cat命令（cat < /dev/ttyS0），而我会发送echo命令。
PRINTF:
打印：
I found that one can also use printf's '%x' command:
我发现还可以使用 printf 的 '%x' 命令：
c="\x"$(printf '%x' 0x12)
printf $c >> $SERIAL_COMM_PORT
Again, for printf, start cat < /dev/ttyS0before sending the command.
同样，对于 printf，cat < /dev/ttyS0在发送命令之前启动。
