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#!/usr/bin/python
import serial,time
import struct
import sys
if serial.Serial('COM2',9600).isOpen():
serial.Serial('COM2',9600).close()
s= serial.Serial('COM2',9600)
#s.write("A")
s.flushOutput()
s.flushInput()
time.sleep(2)
a = '00000001'
b = '00000011'
c = '00001111'
d = '01001110'
e = '00000000'
f = '00000010'
g = '10100111'
h = '00001000'
aa = str(chr(int(a,2)))
bb = str(chr(int(b,2)))
cc = str(chr(int(c,2)))
dd = str(chr(int(d,2)))
ee = str(chr(int(e,2)))
ff = str(chr(int(f,2)))
gg = str(chr(int(g,2)))
hh = str(chr(int(h,2)))
fin = aa + bb + cc + dd + ee + ff + gg + hh
#s.flushOutput()
finaly = s.write(fin.encode('utf-8'))
time.sleep(0.5)
i = 0
ll = []
while True:
time.sleep(0.001)
if s.inWaiting() != 0:
#s.flushInput()
ll.append(s.read())
#print ll
if len(ll) == 9:
temp = str(ll[5].encode('hex')) + str(ll[6].encode('hex')) + str(ll[3].encode('hex')) + str(ll[4].encode('hex'))
#print temp
ans = struct.unpack('!f', temp.decode('hex'))[0]
temp = str(ans).split("e")
print ('Value of active power on energy meter is %s' %(ans))
break
s.close()
time.sleep(1)
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