import serial

def connect() :
    
    dev = '/dev/ttyUSB.KEITHLEY'
    baudrate = 34800

    ser = serial.Serial(port = dev, baudrate = baudrate, rtscts = 0,  xonxoff = 0, bytesize = serial.EIGHTBITS, parity = serial.PARITY_NONE, stopbits = serial.STOPBITS_ONE, timeout = 0.5)

    return ser