simple nodeforwarderded 2400 control

libkeithley.py

##Author: 
##Date Started: 
##Notes: 

from time import *
import pandas as pd
import requests as req
import re


p_write = "http://localhost:9001/writecf/"
p_read =  "http://localhost:9001/read/"

def write(cmd):
    return req.get(p_write+cmd+'\r\n').text

def read():
    return req.get(p_read).text.splitlines()
    

def on():
    write(":OUTP ON")
    sleep(1)
    write(":OUTP ON")
    # write(":OUTP?")
    
    
def setVoltage(value,curr_limit): #feed in a voltage value and upper Current limit (A)
    write("SENS:FUNC \"CURR\"")
    write(":SOUR:FUNC:MODE VOLT")
    write(":SOUR:VOLT:MODE FIX")
    write(":SENS:CURR:RANG:AUTO ON")
    write(":SOUR:VOLT:RANG:AUTO ON")
    write(":SENS:CURR:PROT "+str(curr_limit))
    write(":SOUR:VOLT "+ str(value))
    write(":READ?")

def setCurrent(value,volt_limit): #feed it a current Amps, and upper safety (V)
    write(":SENS:FUNC \"VOLT\"")
    write(":SOUR:FUNC:MODE CURR")
    write(":SOUR:CURR:MODE FIX")
    write(":SOUR:CURR:RANG:AUTO ON")
    write(":SENS:VOLT:RANG:AUTO ON")
    write(":SENS:VOLT:PROT "+str(volt_limit))
    write(":SOUR:CURR "+ str(value))
    write(":READ?")

def off():
    setCurrent(0.0,4.5)
    write(":OUTP OFF")
    sleep(1)

def parse(string):
    for s in string:
        parts = re.split(r'[,;]+',s)
    volts = float(parts[0])
    amps = float(parts[1])
    res = float(parts[2])
    tii = float(parts[3])
    stat = float(parts[4])
    return volts,amps,res,tii,stat
    #print parts

def readData(cyc=0):
    try:
        data = dict()
        write(":READ?")
        sleep(0.5)
        info = read()
        datastring=parse(info)
        # data['time'] = time()
        data['voltage'] = datastring[0]
        data['current'] = datastring[1]
        data['resistance'] = datastring[2]
        data['time'] = datastring[3]
        data['status'] = datastring[4]
        data['cycle'] = cyc
        data['t'] = int(time())
    except ValueError:
        print("oops!")
        pass
    return data
    
def appendData(fn,data,head=True):
    try:
        dlist = []
        dlist.append(data)
        pdat = pd.DataFrame(dlist)
        # with open('fn', 'a') as f:
        #      fn.to_csv(f, header=False)
        pdat.to_csv(fn,mode='a',header=False,index=False)
        # pdat.to_csv(fn)
    except Exception as E:
        print(E)
        
if __name__ == "__main__":
    off()
    # ser = serial.Serial('/dev/ttyUSB1',19200,timeout=3)
    on()
    data= readData(cyc=0)
    print(data)
    off()