hpib.py 5.83 KB
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import serial
import time
import re
import platform
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class PrologixGpibUsb():
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    def __init__(self, port="", timeout=1, portFormat="%d", maxDeviceNum=9, verbose=False,
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                 findDevices=False):
        if port == "":
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            if platform.system() == "Linux":
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                port = "/dev/ttyUSB0"
                portFormat = "%d"
                maxDeviceNum = 99
            elif platform.system() == "Darwin":
                port = "/dev/ttys000"
                portFormat = "%03d"
                maxDeviceNum = 999
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            else:
                raise NotImplementedError("Windows is not supported")
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        if verbose:
            print "Looking for ports such as %s in range %d on %s" % \
                  ( port, maxDeviceNum, platform.system() )
        self._rematch=re.search(r"(/dev/tty.*[^0-9])([0-9]+$)",port)
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        if not self._rematch:
            raise ValueError(port)

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        self._serialPort = None
        while int(self._rematch.group(2)) < maxDeviceNum:
            if verbose:
                print "trying ", port
            try:
                self._serialPort = serial.Serial(port,timeout=timeout)
                break
            except serial.SerialException:
                port=self._rematch.group(1) +\
                      (portFormat % (int(self._rematch.group(2))+1))
                self._rematch=re.search("(/dev/tty.*[^0-9])([0-9]+$)",port)
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        if self._serialPort==None:
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            raise serial.SerialException("Cannot find port")
        self._serialPort.write("++savecfg 0"       + chr(10))
        self._serialPort.write("++auto 0"          + chr(10))
        self._serialPort.write("++eoi 1"           + chr(10))
        self._serialPort.write("++eos 2"           + chr(10))
        self._serialPort.write("++eot_enable 0"    + chr(10))
        self._serialPort.write("++eot_char 0"      + chr(10))
        self._serialPort.write("++read_tmo_ms 500" + chr(10))
        if findDevices:
            self._devices = []
            for self._hpib_address in range(0, 31):
                self._commandStr = "++addr " + str(self._hpib_address) + chr(10) + \
                                   "*idn?" + chr(10) + \
                                   "++read" + chr(10)
                self._serialPort.write(self._commandStr)
                self._returnStr = self._serialPort.readline()
                if self._returnStr != "":
                    self._devices += [self._hpib_address, self._returnStr]
        else:
            self._devices = "Not scanned."
        self._hpib_address = -1
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    def command(self, hpib_address, commandStr):
        if hpib_address != self._hpib_address:
            self._commandStr = "++addr " + str(hpib_address)+chr(10)
            self._hpib_address = hpib_address
        else:
            self._commandStr = ""
        self._commandStr += commandStr+chr(10)
        self._commandCount = self._serialPort.write(self._commandStr)
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    def query(self, hpib_address, queryStr, count=80):
        if hpib_address != self._hpib_address:
            self._commandStr = "++addr " + str(hpib_address)+chr(10)
            self._hpib_address = hpib_address
        else:
            self._commandStr = ""
        self._commandStr += queryStr + chr(10) + "++read eoi" + chr(10)
        self._commandCount = self._serialPort.write(self._commandStr)
        self._returnStr = self._serialPort.readline()
        return self._returnStr[:-1]
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    def setLocal(self, hpib_address):
        #self._commandStr = "++addr "+str(hpib_address)+chr(10)+"loc "+str(hpib_address)+chr(10)
        #self._commandCount = self._serialPort.write(self._commandStr)
        return
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    def getDevices(self):
        return self._devices
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class GPIB_232_485CT_A():
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    def __init__(self, port="/dev/ttyS0", baudrate=9600, bytesize=serial.EIGHTBITS,
                 parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, interCharTimeout=None,
                 pause=0, timeout=10):
        self._serialPort = serial.Serial(port, baudrate, bytesize, parity, stopbits,
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                                         interCharTimeout, timeout)
        self._serialPort.flushInput()
        self._pause = pause
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    def command(self, hpib_address, commandStr):
        self._commandStr = "wr "+str(hpib_address)+chr(10)+commandStr+chr(13)
        self._commandCount = self._serialPort.write(self._commandStr)
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    def query(self, hpib_address, queryStr, count=80):
        # flushInput should not be necessary
        # self._serialPort.flushInput()
        self._commandStr = "wr "+str(hpib_address)+chr(10)+queryStr+chr(13)
        self._commandCount = self._serialPort.write(self._commandStr)
        self._queryStr = "rd #"+str(count)+" "+str(hpib_address)+chr(13)
        self._queryCount = self._serialPort.write(self._queryStr)
        self._returnStr = self._serialPort.read(count)
        self._returnCnt = int(self._serialPort.readline())
        return self._returnStr[:self._returnCnt-1]
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    def setLocal(self, hpib_address):
        self._commandStr = "loc "+str(hpib_address)+chr(13)
        self._commandCount = self._serialPort.write(self._commandStr)
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class hpib_device():
    def __init__(self, hpib_address, port, keepLocal=False,pause=0):
        self._hpib_address = hpib_address
        self._port = port
        self._keepLocal = keepLocal
        self._pause = pause
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    def keepRemote(self, keepRemote=False):
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        self._keepLocal = not keepRemote
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    def setLocal(self, set2Local=True):
        if set2Local:
            self._port.setLocal(self._hpib_address)
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    def command(self, commandStr):
        self._port.command(self._hpib_address, commandStr)
        self.setLocal(self._keepLocal)
        time.sleep(self._pause)
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    def query(self, queryStr):
        self._answerStr = self._port.query(self._hpib_address, queryStr)
        self.setLocal(self._keepLocal)
        return self._answerStr

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    def getDevices(self):
        return ["Not implemented"]