項目需要對頻譜儀遠程操作，因此初步寫了幾個功能，不完善，有空繼續添加

羅德頻譜儀相關

"""An SignalAnalyzer class and some helper functions. NOTE: ?The ROHDE&SCHWARZ SignalAnalzer's port is 5025, different from Aglinet's port 5023 Only tested on Agilent N9000A CXA Signal Analyzer. Example: >>> from signalanalyzerlib import SA? >>> sa = SA('192.168.1.3', 5023) # connect to the signal analyzer, using port 5023 >>> sa.getwelcome() # check if connect success 'Welcome to A-N9000A-10507' >>> sa.set_freq_cent(440, 'M') # set center freq to 440MHz True >>> # call other functions ... >>> sa.close() >>> Note: It's user's responsibility adding delay between calling these helper functions Here is a nice test: python signalanalyzerlib.py 192.168.1.3 5023 """ # # Create by zhuzhenyu @ 2012.12.27 # import sys import os try: ? ? import SOCKS; socket = SOCKS; del SOCKS except ImportError: ? ? import socket __all__ = ["SA"] __version__ = '0.1' # Line terminators (we always output CRLF, but accept any of CRLF, CR, LF) CRLF = '\r\n' # The class itself class SA: ? ? '''An Signal Analyzer connection class. ? ? To create a connection, call the class using these arguments: ? ? ? ? host, port ''' ? ? debugging = 0 ? ? host = '' ? ? port = 0? ? ? sock = None ? ? file = None ? ? welcome = None ? ? # Initialization method (called by class instantiation). ? ? def __init__(self, host='', port=0): ? ? ? ? if host: ? ? ? ? ? ? self.connect(host, port) ? ?? ? ? def connect(self, host='', port=0): ? ? ? ? '''Connect to host(SA). ?Arguments are: ? ? ? ? - host: hostname to connect to (string) ? ? ? ? - port: port to connect to (integer)''' ? ? ? ? if host != '': ? ? ? ? ? ? self.host = host ? ? ? ? if port > 0: ? ? ? ? ? ? self.port = port ? ? ? ? self.sock = socket.create_connection((self.host, self.port)) ? ? ? ? self.file = self.sock.makefile('rb') #self.welcome = self.getresp() #return self.welcome? ? ? def getwelcome(self): ? ? ? ? '''Get the welcome messgage from the analyzer. ? ? ? ? (this is read and squirreled away by connect())''' ? ? ? ? if self.debugging: ? ? ? ? ? ? print '*welcome*', repr(self.welcome) ? ? ? ? return self.welcome ? ? def set_debuglevel(self, level): ? ? ? ? '''Set the debugging level. ? ? ? ? The required argument level means: ? ? ? ? 0: no debugging output(default) ? ? ? ? 1: print commands and responses but not body text etc. ? ? ? ? 2: also print raw lines read and sent before stripping CR/LF''' ? ? ? ? self.debugging = level ? ? debug = set_debuglevel ? ? # Internal: return one line from the analyzer, stripping CRLF. ? ? # Raise EOFError if the connection is closed. ? ? def getline(self): ? ? ? ? line = self.file.readline() ? ? ? ? if self.debugging > 1: ? ? ? ? ? ? print '*get*', repr(line) ? ? ? ? if not line: raise EOFError ? ? ? ? if line[-2:] == CRLF: line = line[:-2] ? ? ? ? elif line[-1:] in CRLF: line = line[:-1] ? ? ? ? return line ? ? # Internal: get a response from the analyzer, which may possibly ? ? # consist of multiple lines. ?Return a single string with no ? ? # trailing CRLF. ?If the response consists of multiple lines, ? ? # these are separated by '\n' characters in the string ? ? def getmultiline(self): ? ? ? ? line = self.getline() ? ? ? ? if '?' in line: # query cmd contains a '?', so does the response ? ? ? ? ? ? nextline = self.getline() ? ? ? ? ? ? line = line + ('\n' + nextline) ? ? ? ? return line ? ? # Internal: get a response from the analyzer. ? ? def getresp(self): ? ? ? ? resp = self.getmultiline() ? ? ? ? if self.debugging: print '*resp*', repr(resp) ? ? ? ? return resp ? ? # Internal: send one line to the analyzer, appending CRLF ? ? def putline(self, line): ? ? ? ? line = line + CRLF ? ? ? ? if self.debugging > 1: print '*put*', repr(line) ? ? ? ? self.sock.sendall(line) ? ?? ? ? # Internal: send one command to the analyzer (through putline()) ? ? def putcmd(self, line): ? ? ? ? if self.debugging: print '*cmd*', repr(line) ? ? ? ? self.putline(line) ? ? def sendcmd(self, cmd): ? ? ? ? '''Send a command and return the response.''' ? ? ? ? self.putcmd(cmd) ? ? ? ? return self.getresp() ? ? # Internal: skip 'SCPI>' prompt in the response and strip ? ? def skipprompt(self, s): ? ? ? ? if s[:6] == 'SCPI> ' or s[:6] == 'scpi> ': ? ? ? ? ? ? s = s[6:] ? ? ? ? # FIXME: Don't know why such strange bytes always in the first response ? ? ? ? if '\xff\xfb\x01\xff\xfb\x03' == s[:6]:? ? ? ? ? ? ? s = s[6:] ? ? ? ? return s.strip() ? ?? ? ? # Internal: get result from multiline response ? ? def extractresult(self, s): ? ? ? ? return s ? ? def voidcmd(self, cmd): ? ? ? ? '''Send a command and expect a response equal with the command.''' ? ? ? ? self.putcmd(cmd) #self.skipprompt(self.getresp()) == cmd) ? ? def resultcmd(self, cmd): ? ? ? ? '''Send a command and expect a response which is a number.''' ? ? ? ? self.putcmd(cmd) ? ? ? ? return self.extractresult(self.skipprompt(self.getresp())) ? ? def close(self): ? ? ? ? '''Close the connection without assuming anything about it.''' ? ? ? ? if self.file: ? ? ? ? ? ? self.file.close() ? ? ? ? ? ? self.sock.close() ? ? ? ? ? ? self.file = self.sock = None ? ? # Check "Agilent X-Series Signal Analyzer User's and Programmer's Reference" ? ? # for the details of the following helper functions ? ? def freq_cent(self, freq, unit='M'): ? ? ? ? cmd = 'FREQ:CENT ' + str(freq) + unit + 'Hz' ? ? ? ? self.voidcmd(cmd) ? ? def freq_span(self, span, unit='M'): ? ? ? ? cmd = 'FREQ:SPAN ' + str(span) + unit + 'Hz' ? ? ? ? self.voidcmd(cmd) ? ? def disp_wind_trac_y_rlev(self, lev): ? ? ? ? cmd = 'DISP:WIND:TRAC:Y:RLEV ' + str(lev) + 'dBm' ? ? ? ? self.voidcmd(cmd) ? ? def band(self, width, unit='K'): ? ? ? ? cmd = 'BAND ' + str(width) + unit + 'Hz' ? ? ? ? self.voidcmd(cmd) ? ? def band_vid(self, width, unit='K'): ? ? ? ? cmd = 'BAND:VID ' + str(width) + unit + 'Hz' ? ? ? ? self.voidcmd(cmd) ? ?? ? ? def calc_mark_mode_pos(self): ? ? ? ? cmd = 'CALC:MARK:MODE POS' ? ? ? ? self.voidcmd(cmd) ? ? def calc_mark_max(self): ? ? ? ? cmd = 'CALC:MARK:MAX' ? ? ? ? self.voidcmd(cmd) ? ? def set_harm_num(self, num): ? ? ? ? cmd = 'CALC:MARK:FUNC:HARM:NHAR ' + str(num)? ? ? ? ? self.voidcmd(cmd) ? ? def set_harm_on_off(self, switch): if switch == 'ON': cmd = 'CALC:MARK:FUNC:HARM:STAT ' + switch? self.voidcmd(cmd) elif switch == 'OFF': cmd = 'CALC:MARK:FUNC:HARM:STAT ' + switch? self.voidcmd(cmd) else: pass ? ? def read_harm_value(self): ? ? ? ? cmd = 'CALC:MARK:FUNC:HARM:LIST?'? ? ? ? ? return self.resultcmd(cmd) ? ? def calc_mark_x(self): ? ? ? ? cmd = 'CALC:MARK:X?' ? ? ? ? return self.resultcmd(cmd) ? ? def calc_mark_y(self): ? ? ? ? cmd = 'CALC:MARK:Y?' ? ? ? ? return self.resultcmd(cmd) ? ?? ? ? def calc_mark_aoff(self): ? ? ? ? cmd = 'CALC:MARK:AOFF' ? ? ? ? self.voidcmd(cmd) ? ?? ? ? # TODO: add other functions here def test(): ? ? '''Test program. ? ? Usage: sa [-d] host port? ? ? -d debug ? ? This test program will set the analyzer's center freq to 456MHz, ? ? set the freq span to 20MHz... ?and output measured freq and power. ? ? ''' ? ? import time ? ? if len(sys.argv) < 3: ? ? ? ? print test.__doc__ ? ? ? ? sys.exit(0) ? ? debugging = 0 ? ? while sys.argv[1] == '-d': ? ? ? ? debugging = debugging + 1 ? ? ? ? del sys.argv[1] ? ? host = sys.argv[1] ? ? port = sys.argv[2] ? ? sa = SA(host, port) ? ? sa.set_debuglevel(debugging) #print sa.getwelcome() ? ? sa.freq_cent(456, 'M') ? ? sa.freq_span(20, 'M') ? ? sa.disp_wind_trac_y_rlev(20) ? ? sa.band(10, 'K') ? ? sa.band_vid(10, 'K') ? ? sa.calc_mark_mode_pos() ? ? # must sleep here after calc_mark_mode_pos and calc_mark_max ? ? time.sleep(2) ? ? sa.calc_mark_max() ? ? time.sleep(5) ? ? currentfreq = sa.calc_mark_x() ? ? currentpower = sa.calc_mark_y() ? ? sa.calc_mark_aoff() ? ? sa.close() ? ? print 'Current Freq:', currentfreq ? ? print 'Current Power:', currentpower if __name__ == '__main__': ? ? test()

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