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1. pyserial (http://pyserial.wiki.sourceforge.net/pySerial)
2. pywin32 (http://sourceforge.net/projects/pywin32/)
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snd = ''
snd += chr(97)
data = 0x12345678
snd += pack.('i', data)
snd += chr(0x64)
self.l_serial.write(snd);
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if recv[2] == 'a':
   pass
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if recv[2] == 0x97:
   pass
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#coding=gb18030
import sys,threading,time;
import serial;
import binascii,encodings;
import re;
import socket;
from struct import *;
class ComThread:
    def __init__(self, Port=0):
        self.l_serial = None;
        self.alive = False;
        self.waitEnd = None;
        self.port = Port;
    def waiting(self):
        if not self.waitEnd is None:
            self.waitEnd.wait();
    def SetStopEvent(self):
        if not self.waitEnd is None:
            self.waitEnd.set();
        self.alive = False;
        self.stop();
    def start(self):
        self.l_serial = serial.Serial();
        self.l_serial.port = self.port;
        self.l_se