Full examples of using pySerial package

Can someone please show me a full python sample code that uses pyserial, i have the package and am wondering how to send the AT commands and read them back!

Blog post 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

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

use https://pythonhosted.org/pyserial/ for more examples

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 "

I have not used pyserial but based on the API documentation at https://pyserial.readthedocs.io/en/latest/shortintro.html it seems like a very nice interface. It might be worth double-checking the specification for AT commands of the device/radio/whatever you are dealing with.

Specifically, some require some period of silence before and/or after the AT command for it to enter into command mode. I have encountered some which do not like reads of the response without some delay first.