控制只通過超級終端使用python進行交互的設備

我想寫一個基本的驅動程序來控制只與超級終端交互的設備。所有輸入都需要HT格式化數據，並且所有的回報都包含豐富的等號，換行符和空格，以便爲人類可視化獲得正確的格式。我非常確定回報會產生麻煩，因爲我會拋出異常，但我不知道我還能如何處理它。有誰知道更好的方法來做到這一點？控制只通過超級終端使用python進行交互的設備

設備手冊：http://us.startech.com/media/products/PCM815SHNA/Manuals/PCM815SHNA.pdf

import visa 
import re 


class iopower8(visa.SerialInstrument): 
    #initialization 
    def __init__(self,loc): 
     visa.SerialInstrument.__init__(self,loc) 
     self.term_chars = '\r' #set terminal characters 
     self.write('\r\r') #start faux 'Hyperterminal' 

    def on(self, bank, out): 
     self.ask("on " + str(bank) + " " + str(out)) 
     for i in range (1,3):#read buffer into void to prevent issues 
      try: 
       self.read_raw() 
      except(visa_exceptions.VisaIOError): 
       self.buffer_clear() 
       break 
     return self.status(bank, out) 

    def off(self, bank, out): 
     self.ask("of " + str(bank) + " " + str(out)) 
     for i in range (1,3):#read buffer into void to prevent issues 
      try: 
       self.read_raw() 
      except(visa_exceptions.VisaIOError): 
       self.buffer_clear() 
       break 
     return self.status(bank, out) 

    def status(self, bank, port): #enter bank and port # you want to check 
     self.ask("st " + str(bank)) 
     result = 'Error' #send error message regardless 
     for i in range (1,13):#all 12 lines need to be read out of the buffer to prevent issues later 
      try: 
       stuff = self.read()#read the line to a holding srting, and dump in void if wriong line to clear buffer 
       if stuff.strip() == ('='*44): 
        break 
      except(visa_exceptions.VisaIOError): 
       break 
     for i in range(1,9): 
      try: 
       stuff = self.read()#read the line to a holding string, and dump in void if wriong line to clear buffer. 
       if i == port: #this offset will get you to the line with the relevant port's status 
        result = re.match('(.*?)(ON|OFF)', stuff) #regex to the find the on/off status 
        #convert to boolean 
        if result.group(2) == 'ON': 
         result = True 
        elif result.group(2) =='OFF': 
         result = False 
        else: 
         result = 'ERROR' 
      except(visa_exceptions.VisaIOError): 
       self.buffer_clear() 
       break 
     return result 

    def buffer_clear(self): #in case of buffer jamming 
     while True: 
      try: 
       self.read_raw() 
      except(visa_exceptions.VisaIOError): 
       break 

    def all_on(self, bank): 
     self.ask("on " + str(bank) + " 0") 
     for i in range (1,3):#read buffer into void to prevent issues 
      try: 
       hold = self.read_raw() 
      except(visa_exceptions.VisaIOError): 
       self.buffer_clear() 
       break 

    def all_off(self, bank): 
     self.ask("of " + str(bank) + " 0") 
     for i in range (1,3):#read buffer into void to prevent issues 
      try: 
       self.read_raw() 
      except(visa_exceptions.VisaIOError): 
       self.buffer_clear() 
       break

來源

2011-02-02 Elliot

超級終端含義RS232？ http://www.varesano.net/blog/fabio/serial%20rs232%20connections%20python – Novikov 2011-02-02 19:06:23

問題是格式。該設備是硬編碼，總是假定它正在與超級終端進行交互，所以輸出中存在大量垃圾，而且緩衝區中的多餘數據顯然沒有做足夠好的過濾工作，因爲它會週期性地拋出例外。據我所知，超級終端標準沒有很好的記錄。 – Elliot 2011-02-02 19:12:11

沒有什麼特別之處HiperTerminal。行尾字符通常爲'\r\n'或'\n'。

來源

2011-02-02 19:40:02 vz0

控制只通過超級終端使用python進行交互的設備

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