以编程方式与 OS X 或 Linux 中的串行端口通信 [英] Programmatically talking to a Serial Port in OS X or Linux
问题描述
我有一个 Prolite LED 标志，我喜欢设置它来显示来自 apache 日志和其他有趣统计数据的滚动搜索查询.问题是，我的 G5 没有串口，所以我必须使用 USB 转串口加密狗.它显示为/dev/cu.usbserial 和/dev/tty.usbserial .
I have a Prolite LED sign that I like to set up to show scrolling search queries from a apache logs and other fun statistics. The problem is, my G5 does not have a serial port, so I have to use a usb to serial dongle. It shows up as /dev/cu.usbserial and /dev/tty.usbserial .
当我这样做的时候，一切似乎都很糟糕:
When i do this everything seems to be hunky-dory:
stty -f /dev/cu.usbserial
speed 9600 baud;
lflags: -icanon -isig -iexten -echo
iflags: -icrnl -ixon -ixany -imaxbel -brkint
oflags: -opost -onlcr -oxtabs
cflags: cs8 -parenb
当我使用 串行端口工具 与之交谈时，一切都正常.
Everything also works when I use the serial port tool to talk to it.
如果我在上面提到的串口工具的同时运行这段代码，一切都可以.但是，一旦我断开该工具，连接就会丢失.
If I run this piece of code while the above mentioned serial port tool, everthing also works. But as soon as I disconnect the tool the connection gets lost.
#!/usr/bin/python
import serial
ser = serial.Serial('/dev/cu.usbserial', 9600, timeout=10)
ser.write("<ID01><PA>
")
read_chars = ser.read(20)
print read_chars
ser.close()
所以问题是，我需要执行什么魔法才能在没有串口工具的情况下开始与串口通信?这是权限问题吗?还有，/dev/cu.usbserial 和/dev/tty.usbserial 有什么区别?
So the question is, what magicks do I need to perform to start talking to the serial port without the serial port tool? Is that a permissions problem? Also, what's the difference between /dev/cu.usbserial and /dev/tty.usbserial?
不，没有序列号.问题是，即使使用 sudo 运行 python 脚本，问题仍然存在，并且如果我在我提到的 gui 工具中打开连接，唯一可以解决的问题.
Nope, no serial numbers. The thing is, the problem persists even with sudo-running the python script, and the only thing that makes it go through if I open the connection in the gui tool that I mentioned.
推荐答案
/dev/cu.xxxxx 是callout"设备，当你建立与串口设备的连接时使用它并开始与它交谈./dev/tty.xxxxx 是拨号"设备，用于监控端口的来电，例如一个传真监听器.
/dev/cu.xxxxx is the "callout" device, it's what you use when you establish a connection to the serial device and start talking to it. /dev/tty.xxxxx is the "dialin" device, used for monitoring a port for incoming calls for e.g. a fax listener.
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