我正在尝试为嵌入式板创建一个侦听器。它每命令返回多行，我不太确定EOF格式。我为听众使用以下内容：
(stty raw speed 115200 cs8 -cstopb; cat > received.log) < /dev/ttyUSB0
另一个外壳中的命令是
printf "r" > /dev/ttyUSB0
它返回：命令的多个运行和用
格式格式的每行ERROR: Command is TOO LONG (max chars allowed = 354)
^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^
我使用printf发送所有类型的输入
使用：
printf "n" > /dev/ttyUSB0
给出：
ERROR: Command is TOO LONG (max chars allowed = 354)
^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z^M^J^M^JERROR: Command is TOO LONG (max chars allowed = 354)^M^J^Z
发生了什么事，我该如何解决？串行端口是115200 8N1，没有硬件或软件流控制。
从您的问题中确切清楚地发现ERROR: Command is TOO LONG消息来自何处以及如何查看它。我猜那是您在received.log文件中看到的？
尤其是考虑到您要返回的错误消息包括^M^J(这是说rn(序列的序列，我的猜测是串行连接另一端的设备使用rn用作线路结束的约定，喜欢窗户或dos。(Unix仅使用n，并且还有系统，例如旧的Macintosh OS，仅使用r。(
尝试将第二个命令更改为：
printf "rn" > /dev/ttyUSB0
看看是否有帮助。