Esempi completi di utilizzo del pacchetto pySerial

Question

Qualcuno può mostrarmi un codice di esempio Python completo che utilizza pyserial, ho il pacchetto e mi chiedo come inviare i comandi AT e leggerli di nuovo!

Answer 1

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 

uso http://pyserial.wiki.sourceforge.net/pySerial per ulteriori esempi

Answer 2

Non ho usato pySerial ma sulla base della documentazione API a http://pyserial.wiki.sourceforge.net/pySerial sembra un'interfaccia molto piacevole. Potrebbe valere la pena ricontrollare le specifiche per i comandi AT del dispositivo/radio/qualunque cosa si tratti.

In particolare, alcuni richiedono un certo periodo di silenzio prima e/o dopo il comando AT per farlo entrare in modalità comando. Ho incontrato alcuni che non amano le letture della risposta senza alcun ritardo prima.

Answer 3

Blog inviare Serial RS232 connections in Python

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 

Answer 4

http://www.roman10.net/serial-port-communication-in-python/comment-page-1/#comment-1877

#!/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 "