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在上一篇隨筆中采用VSPD、ModbusTool模擬串口、MODBUS TCP設備進行Python采集軟件開發寫了模擬ER2200的程序，後來進行了完善：數據進行隨機變化，打印輸出進行了完善。

# -*- coding:utf-8 -*-

u"""FIBERPRO偏振消光比測試儀ER2200模擬程序"""

__author__ = ‘zhengbiqing [email protected]‘

import binascii
import signal
import
 
 sys
from random import random
import time

import serial

ser = serial.Serial(‘COM4‘, 115200, timeout=1)

print ‘Welcome to ‘, __doc__, ‘,‘, ‘device is %s‘ % (‘Ready‘ if ser.isOpen() else ‘Error‘)
print ‘Author is ‘, __author__


# ctrl+c處理函數
def signal_handler(signal, frame):
    ser.close()
    print
 
 ‘You pressed Ctrl+C! ‘, ‘device is %s‘ % (‘Closed‘ if not ser.isOpen() else ‘Error‘)
    print ‘Goodbye!‘
    sys.exit(0)


# 程序是死循環，通過ctrl+c退出，為了在退出時關閉串口，捕獲該信號
signal.signal(signal.SIGINT, signal_handler)

while True:
    data = ser.read(7)
    if len(data):
        # 調試打印，b2a_hex(data)是把字符串data轉換為十六進制數
 

        now = time.localtime(time.time())
        HMS = time.strftime(‘%H:%M:%S‘, now)
        print ‘%s <- %s(%r)‘ % (HMS, binascii.b2a_hex(data), data)

    if data == ‘read?\r\n‘:
        # 三個數字分別表示被測光的消光比,偏振角度,和光功率
        classtalk = 19.35 + round(random(), 2)
        angle = 53.47 + round(random(), 2)
        power = -5.17 + round(random(), 2)
        sendstr = str(classtalk) + ‘,‘ + str(angle) + ‘,‘ + str(power) + ‘\r‘
        now = time.localtime(time.time())
        HMS = time.strftime(‘%H:%M:%S‘, now)
        print ‘%s -> %s‘ % (HMS, sendstr)
        ser.write(sendstr)

模擬FIBERPRO偏振消光比測試儀ER2200的Python程序