使用pySerial软件包的完整示例[关闭]

96

有人可以告诉我使用pyserial的完整python示例代码，我拥有该软件包，并且想知道如何发送AT命令并读回它们！

python modem pyserial

— 盖特
source

88

import time
import serial

# configure the serial connections (the parameters differs on the device you are connecting to)
ser = serial.Serial(
    port='/dev/ttyUSB1',
    baudrate=9600,
    parity=serial.PARITY_ODD,
    stopbits=serial.STOPBITS_TWO,
    bytesize=serial.SEVENBITS
)

ser.isOpen()

print 'Enter your commands below.\r\nInsert "exit" to leave the application.'

input=1
while 1 :
    # get keyboard input
    input = raw_input(">> ")
        # Python 3 users
        # input = input(">> ")
    if input == 'exit':
        ser.close()
        exit()
    else:
        # send the character to the device
        # (note that I happend a \r\n carriage return and line feed to the characters - this is requested by my device)
        ser.write(input + '\r\n')
        out = ''
        # let's wait one second before reading output (let's give device time to answer)
        time.sleep(1)
        while ser.inWaiting() > 0:
            out += ser.read(1)

        if out != '':
            print ">>" + out

— 相框
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8

serial.serialutil.SerialException: Port is already open运行此代码时收到错误。我不确定这一点，但我相信当您按照的方式明确定义串行端口时，它会自动打开ser。在注释掉该ser.open()行后，它起作用了。

— user3817250 2014年

这句话是救星。

— saurabh agarwal

1

@ user3817250：或者只是在ser.open()

— arc_lupus 2015年

1

顺便说一句，拥有一个ser.isopen（）本身没有任何意义。当然，在尝试自己打开它之前，您可以在有条件的情况下使用isopen（r）来检查它是否已打开。如果是这样，则可能表明您的程序已在其他位置运行。然后使用一些Python Fu杀死其他进程，然后重试打开。 stackoverflow.com/questions/6178705/…–

— SDsolar

1

嗨，好代码！我有一个问题，如果改用python 3，您将如何更改？

— 路易斯·荷西

46

import serial
ser = serial.Serial(0)  # open first serial port
print ser.portstr       # check which port was really used
ser.write("hello")      # write a string
ser.close()             # close port

使用https://pythonhosted.org/pyserial/获取更多示例

— 拜达
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28

http://web.archive.org/web/20131107050923/http://www.roman10.net/serial-port-communication-in-python/comment-page-1/

#!/usr/bin/python

import serial, time
#initialization and open the port

#possible timeout values:
#    1. None: wait forever, block call
#    2. 0: non-blocking mode, return immediately
#    3. x, x is bigger than 0, float allowed, timeout block call

ser = serial.Serial()
#ser.port = "/dev/ttyUSB0"
ser.port = "/dev/ttyUSB7"
#ser.port = "/dev/ttyS2"
ser.baudrate = 9600
ser.bytesize = serial.EIGHTBITS #number of bits per bytes
ser.parity = serial.PARITY_NONE #set parity check: no parity
ser.stopbits = serial.STOPBITS_ONE #number of stop bits
#ser.timeout = None          #block read
ser.timeout = 1            #non-block read
#ser.timeout = 2              #timeout block read
ser.xonxoff = False     #disable software flow control
ser.rtscts = False     #disable hardware (RTS/CTS) flow control
ser.dsrdtr = False       #disable hardware (DSR/DTR) flow control
ser.writeTimeout = 2     #timeout for write

try: 
    ser.open()
except Exception, e:
    print "error open serial port: " + str(e)
    exit()

if ser.isOpen():

    try:
        ser.flushInput() #flush input buffer, discarding all its contents
        ser.flushOutput()#flush output buffer, aborting current output 
                 #and discard all that is in buffer

        #write data
        ser.write("AT+CSQ")
        print("write data: AT+CSQ")

       time.sleep(0.5)  #give the serial port sometime to receive the data

       numOfLines = 0

       while True:
          response = ser.readline()
          print("read data: " + response)

        numOfLines = numOfLines + 1

        if (numOfLines >= 5):
            break

        ser.close()
    except Exception, e1:
        print "error communicating...: " + str(e1)

else:
    print "cannot open serial port "

— 恩加索
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2

我没有使用过pyserial，但是基于https://pyserial.readthedocs.io/en/latest/shortintro.html上的API文档，这似乎是一个非常不错的界面。可能需要仔细检查设备/无线电/所处理的AT命令的规范。

具体来说，有些命令需要在AT命令之前和/或之后保持一定的静默状态才能使其进入命令模式。我遇到了一些不喜欢读取响应而没有延迟的情况。

— 保罗·奥斯本
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