An example of python implementation controlling COM port

Using RS232 serial port line or Class 1 interface from RS232 to USB, com port will be needed as interface for input and output modulation.

Write a script to control COM port, using Python built-in serial library

The code is as follows:

# coding=utf-8
 
import serial
import time
 
def setTout(t):
  print "Old Timeout is:[%s]" % po1.getTimeout() 
  po1.setTimeout(t)
  print "New Timeout is:[%s]" % po1.getTimeout() 
 
def sendShell(sp,cmd):
  sp.write(cmd+"\n")
  print "send shell cmd:[%s]" % cmd
  str = sp.readall()
  return str
 
def shell_io(sp,cmd,sleepTime):
  str = sendShell(sp,cmd) 
  print str
  time.sleep(sleepTime)
  
po1 = serial.Serial('com1',115200) 
timeStart = time.time() 
portnow = po1.portstr     
print "COM port now is:[%s]" % portnow
setTout(5)
 
shell_io(po1,"ls",2)
 
shell_io(po1,"pwd",2)
 
shell_io(po1,"ls -l",2)
 
po1.close()