I'm trying to send data to an hplc pump via the serial port using python and pyserial. I tested the cable and the pump under linux (a gentoo derivative), where it worked perfectly, albeit as root. Now i have to use the code on a WinXP machine, where i always get an "Access denied" error when trying to open the port (i adjusted the parameters to COMxx instead of ttySxx, the port is found). I tried the serial port of the computer, as well as a USB2Serial adapter. I heard that WinXP was quite restrictive when it comes to trying to address some port with self written code. Is there a simpler workaround for this problem than installing linux?
# -*- coding: utf-8 -*-
import sys
import time
import serial
from threading import Thread
"""
usage: cmdCapture workDirectory pictureTime pressureTime
"""
print 'successful import is successful'
workDir=sys.argv[1]
pressureThresh=float(sys.argv[3])
class doCapture(Thread):
def __init__ (self, workDir, pressureThresh):
Thread.__init__(self)
self.workDir=workDir
self.pressureThresh=pressureThresh
self.pressureTimer=0
-> here i set the serial port
self.ser=serial.Serial(port='\\.\COM1', baudrate=9600, bytesize=serial.EIGHTBITS, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, timeout=1)
-> here the error happens
self.ser.open()
def getPressure(self):
self.ser.write('PR')
return self.ser.read(size=8), timer.timer()
def run(self):
self.pressureTimer=time.timer()
while 1:
if self.pressureTimer<=(time.timer()-self.pressureTime):
self.p=getPressure()
print self.p
myCapture=doCapture(workDir, pressureThresh)
myCapture.start()
