在Python/Win7上使用串口
我正在尝试与串行 WWAN 调制解调器连接（用于诊断/信号强度测量目的）。这是通过我桌面上的板载 COM1 (115200-8-n-1) 进行的，通过 PuTTY 进行连接。我可以使用 Python 编写 AT 命令脚本，但我很难让它打开串行端口。
我已经按照说明安装了Python 2.7.1和PySerial。我是我的机器的本地管理员，并且在有或没有管理员权限的情况下运行Python，但是当我尝试打开端口时，我得到以下信息：
Python 2.7.1 (r271:86832, Nov 27 2010, 17:19:03) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import serial
>>> s = serial.Serial(
... port='COM1',
... baudrate=115200
... )
>>> s.open()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python27\lib\site-packages\serial\serialwin32.py", line 56, in open
raise SerialException("could not open port %s: %s" % (self.portstr, ctypes.W
inError()))
serial.serialutil.SerialException: could not open port COM1: [Error 5] Access is
denied.
据我所知，8-N-1是默认值，即使我尝试手动设置它们会引发相同的异常。
有人可以提供建议吗？ 提前致谢。
I am trying to interface with a serial WWAN modem (for diagnostics /signal strength measurement purposes). This is via the onboard COM1 (115200-8-n-1) on my desktop, the connection works via PuTTY. I can script the AT commands using Python, but I am having a tough time getting it to open the serial port .
I have installed Python 2.7.1 and PySerial according to instructions. I am the local administrator of my machine and have run Python with and without admin privileges, but I get the following when I try to open the port:
Python 2.7.1 (r271:86832, Nov 27 2010, 17:19:03) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import serial
>>> s = serial.Serial(
... port='COM1',
... baudrate=115200
... )
>>> s.open()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python27\lib\site-packages\serial\serialwin32.py", line 56, in open
raise SerialException("could not open port %s: %s" % (self.portstr, ctypes.W
inError()))
serial.serialutil.SerialException: could not open port COM1: [Error 5] Access is
denied.
It is my understanding that 8-N-1 is the default, and even when I try to set them manually it throws the same exception.
Can anyone offer advice?
Thanks in advance.
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评论（3）
您不需要调用
open。构造函数已经做到了这一点，并且在 Windows 上，无论谁打开 COM 端口，都可以独占访问它，直到他们关闭它。关于第二个问题，看看 如何修复“[错误 6] 句柄无效。”使用 PySerial
You don't need to call
open. The constructor already does that, and on Windows whoever opens a COM port has exclusive access to it until they close it.As to the second problem, take a look at How can I fix "[Error 6] The handle is invalid." with PySerial
以下是我消除
访问被拒绝错误的方法：按Ctrl + Alt + Del
选择
pythonw.exe并按结束进程在IDLE中重新运行您的应用程序
它应该在没有任何访问被拒绝的错误的情况下运行。
Here is what I do to eliminate
Access Denied Error:Press Ctrl + Alt + Del
Select
pythonw.exeand press End ProcessRe-Run your application in IDLE
It should be run without any access denied error.
您需要在提升模式下运行
python.exe。右键单击并单击以管理员身份运行You need to be running
python.exein elevated mode. Right click and clickRun as administrator