title: pySerial reading data from AT commands
body: <p>I'm having trouble reading the response from a RS232 OBD2 interface via pySerial.
  The code successfully enters the data, as I can see from a direct parallel terminal screen, but fails to read and print the response, regardless of the response.</p>
  
  <p>Right now the code is not capable of printing the response in neither versions of Python.
  The code looks something like this :</p>
  
  <pre><code>from serial import * # I also tried using /from serial import Serial
  import time
  ser = Serial("/dev/rfcomm1", 38400, timeout=1)
  #print ('Starting up, formatting responses')
  #ser.write("ATZ\r"),
  #ser.write("ATSP0\r"),
  #ser.write("ATS1\r"),
  #ser.write("ATL1\r"),
  #ser.write("ATH1\r"),
  #ser.write("ATF1\r")
  #time.sleep(1)
  #print ('We have lift-off !')
  if ser.inWaiting() &gt; 0:
      ser.flushInput()
  #ser.timeout = 1.
  time.sleep(1)
  #print (raw_data)
  ser.write("AT RV\r") #The response should be something like 13.5V, but nothing
  ser.timeout = 1.
  msg = ser.read(size=1024)
  print msg
  ser.close()
  </code></pre>
  
  <p>I left only the AT RV command because while I'm working on it I sent the text formatting commands to ease the job. Right now when I send it it just gives me a blank line (although the terminal which is running on the same machine displays the desired output)</p>
  
  <p>There are no errors in the code, and the commands go through and are responded to by the interface, and I can see that in another live term, but nothing appears when running the Python code. 
  What should I do ?</p>