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read_dlt645.py
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read_dlt645.py
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#---------------------------------------------------------------------------------------------
# read_dlt645 v01 -- a tool to test dlt645 meter through IR reader
# BSD license is applied to this code
#
# Copyright by Aixi Wang (aixi.wang@hotmail.com)
#
#---------------------------------------------------------------------------------------------
import serial
import sys,time
SERIAL_TIMEOUT_CNT = 10
#-------------------------
# decode_dlt645
#-------------------------
def decode_dlt645(data):
print 'decode_dlt645 hex_str:',data.encode('hex')
if ord(data[0]) != 0x68:
print 'decode_dlt645 fail 1'
return -1,'',''
if ord(data[7]) != 0x68:
print 'decode_dlt645 fail 2'
return -1,'','',''
# check len
len_1 = len(data)
if len_1 < 12:
print 'decode_dlt645 fail 3'
return -1,'','',''
len_2 = ord(data[9]) + 12
if len_1 != len_2:
print 'decode_dlt645 fail 4'
return -1,'','',''
# check tail 0x16
if ord(data[len_2-1]) != 0x16:
print 'decode_dlt645 fail 5'
return -1,'','',''
# check checksum
cs = 0
for i in xrange(0,len_2-2):
#print hex(ord(data[i]))
cs += ord(data[i])
#print 'cs 1:',hex(cs)
cs = cs % 256
#print 'cs 2:',hex(cs)
if cs != ord(data[len_2-2]):
print 'decode_dlt645 fail 6'
return -1,'','',''
# extract data (sub 0x33)
if ord(data[9]) > 0:
d_out = ''
for i in xrange(10,10+ord(data[9])):
d_out += chr(ord(data[i])-0x33)
else:
d_out = ''
return 0, data[1:7],d_out,ord(data[8])
#-------------------------
# encode_dlt645
#-------------------------
def encode_dlt645(addr,ctl,lens,data_tag):
data_tag_2 = ''
lens_data = len(data_tag)
for i in xrange(0,lens_data):
data_tag_2 += chr(ord(data_tag[i])+0x33)
s1 = '\x68' + addr + '\x68' + chr(ctl) + chr(lens) + data_tag_2
# caculate cs
cs = 0
len_1 = len(s1)
#print len_1
for i in xrange(0,len_1):
cs += ord(s1[i])
cs = cs % 256
s1 = s1 + chr(cs)
# add tail
s1 = s1 + '\x16'
print 'encode_dlt645 hex_str:',s1.encode('hex')
return s1
#-------------------------
# dlt645_get_addr
#-------------------------
def dlt645_get_addr(serial):
#print 'dlt645_get_addr ...'
try:
#cmd2 = '\xfe\xfe\xfe\xfe\x68\xaa\xaa\xaa\xaa\xaa\xaa\x68\x13\x00\xdf\x16'
cmd2 = '\xfe\xfe\xfe\xfe' + encode_dlt645('\xaa\xaa\xaa\xaa\xaa\xaa',0x13,0,'')
serial.write(cmd2)
time.sleep(0.5)
resp = ''
c = ''
i = 0
while c != '\x16' and i < SERIAL_TIMEOUT_CNT:
c = serial.read(1)
if len(c) > 0:
resp += c
else:
print '.'
i += 1
if i >= SERIAL_TIMEOUT_CNT:
return -1,0
resp1 = dlt_645_rm_fe(resp)
#print 'resp1:',resp1
ret,addr,data,ctl = decode_dlt645(resp1)
if ret == 0:
return ret,addr
except:
print 'dlt645_get_addr exception!'
return -1,''
#-------------------------
# dlt_645_rm_fe
#-------------------------
def dlt_645_rm_fe(s):
n = s.find('\x68')
if n > 0:
return s[n:]
else:
return ''
#-------------------------
# dlt645_read_data
#-------------------------
def dlt645_read_data(serial,addr,data_tag):
#print 'dlt645_read_data ...'
try:
cmd2 = '\xfe\xfe\xfe\xfe' + encode_dlt645(addr,0x11,4,data_tag)
serial.write(cmd2)
time.sleep(0.5)
resp = ''
c = ''
i = 0
while c != '\x16' and i < SERIAL_TIMEOUT_CNT:
c = serial.read(1)
if len(c) > 0:
resp += c
else:
print '.'
i += 1
if i >= SERIAL_TIMEOUT_CNT:
return -1,0
resp1 = dlt_645_rm_fe(resp)
ret,addr,data,ctl = decode_dlt645(resp1)
#print data.encode('hex')
if ret == 0 and len(data) >= 8:
i = ord(data[7])/16 *10000000
i += ord(data[7])%16 *1000000
i += ord(data[6])/16 *100000
i += ord(data[6])%16 *10000
i += ord(data[5])/16 *1000
i += ord(data[5])%16 *100
i += ord(data[4])/16 *10
i += ord(data[4])%16
return ret,i
else:
return -1,0
except:
print 'dlt645_read_data exception!'
return -1,0
#-------------------------
# read_dlt645_once
#-------------------------
def read_dlt645_once(serial_port,baud_rate):
try:
serialport_baud = baud_rate
serialport_path = serial_port
s = serial.Serial(serialport_path,serialport_baud,parity=serial.PARITY_EVEN,timeout=0.1)
#print s
except:
print 'init serial error!'
return -1,0,0,0
# get meter data, unit : 0.01 kWh
retcode,addr = dlt645_get_addr(s)
print retcode,addr.encode('hex')
if retcode < 0:
print 'get addr error'
return -1,0,0,0
print '-----------------------------------'
retcode,data = dlt645_read_data(s,addr,'\x00\x00\x00\x00')
print retcode,data
if retcode == 0:
f1 = data/100.0
print 'total kWh:',f1
else:
return -1,0,0,0
retcode,data = dlt645_read_data(s,addr,'\x00\x01\x00\x00')
#print retcode,data
if retcode == 0:
f2 = data/100.0
print 'ping kWh:',f2
else:
return -1,0,0,0
retcode,data = dlt645_read_data(s,addr,'\x00\x02\x00\x00')
#print retcode,data
if retcode == 0:
f3 = data/100.0
print 'gu kWh:',f3
else:
return -1,0,0,0
s.close()
return 0,f1,f2,f3
#-------------------------
# main
#-------------------------
if __name__ == '__main__':
ret,f1,f2,f3 = read_dlt645_once('/dev/ttyUSB1',1200)
print ret,f1,f2,f3
try:
serialport_baud = int(sys.argv[1])
serialport_path = sys.argv[2]
s = serial.Serial(serialport_path,serialport_baud,parity=serial.PARITY_EVEN,timeout=0.1)
#print s
# test encode_dlt645
s1 = encode_dlt645('\xaa\xaa\xaa\xaa\xaa\xaa',0x13,0,'')
if s1 == '\x68\xaa\xaa\xaa\xaa\xaa\xaa\x68\x13\x00\xdf\x16':
print 'encode_dlt645 passed'
else:
print 'encode_dlt645 failed'
# test decode_dlt645
s1 = '\xfe\xfe\xfe\xfe\x68\x69\x40\x17\x10\x12\x00\x68\x93\x06\x9c\x73\x4a\x43\x45\x33\x5f\x16'
s2 = dlt_645_rm_fe(s1)
retcode,addr,data,ctl = decode_dlt645(s2)
if retcode == 0 and addr == '\x69\x40\x17\x10\x12\x00' and data == '\x69\x40\x17\x10\x12\x00' and ctl == 0x93:
print 'decode_dlt645 passed'
else:
print 'decode_dlt645 failed'
except:
print 'init serial error!'
sys.exit(-1)
# get meter data, unit : 0.01 kWh
while True:
# get meter addr
retcode,addr = dlt645_get_addr(s)
#print retcode,addr
if retcode < 0:
print 'get addr error'
time.sleep(5)
continue
print '-----------------------------------'
retcode,data = dlt645_read_data(s,addr,'\x00\x00\x00\x00')
#print retcode,data
if retcode == 0:
print 'total kWh:',data/100.0
else:
print 'read error!'
retcode,data = dlt645_read_data(s,addr,'\x00\x01\x00\x00')
#print retcode,data
if retcode == 0:
print 'ping kWh:',data/100.0
else:
print 'read error!'
retcode,data = dlt645_read_data(s,addr,'\x00\x02\x00\x00')
#print retcode,data
if retcode == 0:
print 'gu kWh:',data/100.0
else:
print 'read error!'
time.sleep(5)
s.close()