模擬FIBERPRO偏振消光比測試儀ER2200的Python程序
阿新 • • 發佈:2017-05-29
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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 importsys 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