Comments (4)
dawidce
commented on May 28, 2024
I think that i need to decode b before comparing b.decode('iso-8859-1')
from iec62056-21.
dawidce
commented on May 28, 2024
still no luck :(
from iec62056-21.
Krolken
commented on May 28, 2024
Hi.
I am assuming you are trying to read the meter over TCP.
It looks like the modem on the meter is not transforming the bytes received to the correct byte representation.
This is common on meters with integrated modems using IEC62056-21. They just slapped on a modem and connected it to the normal serial input.
So normal IEC 62056-21 over serial line uses 7E1 byte representation. 7 bits for the data, even parity and 1 stopbit.
See the code for the SerialTransport:
self.port = serial.Serial(
self.port_name,
baudrate=baudrate,
parity=serial.PARITY_EVEN,
stopbits=serial.STOPBITS_ONE,
bytesize=serial.SEVENBITS,
writeTimeout=0,
timeout=self.timeout / 2,
rtscts=False,
dsrdtr=False,
xonxoff=False,
)When we send it over TCP all 8 bits are used and are pushed out on the serial line, independent of the parity.
So to correct this you need to recalculate how the data should look like on the serial line and then send those bytes.
And when you receive data it will have the parity bit, that you need to remove.
I did this a while back ago for an EMH meter:
def remove_parity(input):
"""Function that converts 8bit byte string into 7bit byte string by removing the parity bit"""
data_list = []
for byte in input:
temp = byte & 0x7f
temp = chr(temp).encode('latin-1')
data_list.append(temp)
return b''.join(data_list)
def add_parity(input_string):
"""Function to add (even) parity to a string of hex byte representations.
For example '2f 3f 37 30' -> 'af 3f b7 30'.
"""
output = [] # Create empty list for output
for x in input_string: # Loop through all bytes in input_string
nonzero_bit_count = bin(x).count('1') # Count non-zero bits (i.e. 1s)
if nonzero_bit_count % 2 is 1: # If uneven amount of bits, parity is needed
temp = x | 0x80 # Add parity using bitwise OR with 0x80 (1000 000)
output.append(chr(temp))
else: # Parity bit not needed
output.append(chr(x)) # Byte is added unchanged
output_string = ''.join(output) # Converts list to string
return output_string.encode('latin-1')The code is quite old and not fully functional with the state of the library as it is now. But I would recommend that you subclass the TcpTransport or BaseTransport and add this rewriting of the bytes as you send and receives.
If i run the data you have gotten:
print(remove_parity(data).decode('latin-1'))I get:
/LGZ5\2ZMD4054459.B40
�F.F(00000000)
0.9.1(23:16:43)
0.9.2(21-01-04)
0.0.0()
C.1.0(54800102)
C.90.1(54800102)
C.90.2(01102)
0.2.2(B21)
0.1.0(04)
0.1.0*12(21-01-01 00:00)
0.1.0&12(20-12-30 16:02)
0.1.0*00(00-00-00 00:00)
0.1.0*00(00-00-00 00:00)
0.1.2(00:00)
0.1.3(21-01-01)
1.8.1(0302.8260*kWh)
1.8.1*12(0075.5341*kWh)
1.8.1&12(0000.0000*kWh)
1.8.1*00(0000.0000*kWh)
1.8.1*00(0000.0000*kWh)
1.8.2(0000.0000*kWh)
1.8.2*12(0000.0000*kWh)
1.8.2&12(0000.0000*kWh)
1.8.2*00(0000.0000*kWh)
1.8.2*00(0000.0000*kWh)
1.8.3(0000.0000*kWh)
1.8.3*12(0000.0000*kWh)
1.8.3&12(0000.0000*kWh)
1.8.3*00(0000.0000*kWh)
1.8.3*00(0000.0000*kWh)
1.8.0(0302.8260*kWh)
1.8.0*12(0075.5341*kWh)
1.8.0&12(0000.0000*kWh)
1.8.0*00(0000.0000*kWh)
1.8.0*00(0000.0000*kWh)
2.8.1(0000.0000*kWh)
2.8.1*12(0000.0000*kWh)
2.8.1&12(0000.0000*kWh)
2.8.1*00(0000.0000*kWh)
2.8.1*00(0000.0000*kWh)
2.8.2(0000.0000*kWh)
2.8.2*12(0000.0000*kWh)
2.8.2&12(0000.0000*kWh)
2.8.2*00(0000.0000*kWh)
2.8.2*00(0000.0000*kWh)
2.8.3(0000.0000*kWh)
2.8.3*12(0000.0000*kWh)
2.8.3&12(0000.0000*kWh)
2.8.3*00(0000.0000*kWh)
2.8.3*00(0000.0000*kWh)
2.8.0(0000.0000*kWh)
2.8.0*12(0000.0000*kWh)
2.8.0&12(0000.0000*kWh)
2.8.0*00(0000.0000*kWh)
2.8.0*00(0000.0000*kWh)
5.8.1(0064.3714*kvarh)
5.8.1*12(0016.0599*kvarh)
5.8.1&12(0000.0000*kvarh)
5.8.1*00(0000.0000*kvarh)
5.8.1*00(0000.0000*kvarh)
5.8.2(0000.0000*kvarh)
5.8.2*12(0000.0000*kvarh)
5.8.2&12(0000.0000*kvarh)
5.8.2*00(0000.0000*kvarh)
5.8.2*00(0000.0000*kvarh)
5.8.3(0000.0000*kvarh)
5.8.3*12(0000.0000*kvarh)
5.8.3&12(0000.0000*kvarh)
5.8.3*00(0000.0000*kvarh)
5.8.3*00(0000.0000*kvarh)
5.8.0(0064.3714*kvarh)
5.8.0*12(0016.0599*kvarh)
5.8.0&12(0000.0000*kvarh)
5.8.0*00(0000.0000*kvarh)
5.8.0*00(0000.0000*kvarh)
6.8.1(0000.0004*kvarh)
6.8.1*12(0000.0004*kvarh)
6.8.1&12(0000.0000*kvarh)
6.8.1*00(0000.0000*kvarh)
6.8.1*00(0000.0000*kvarh)
6.8.2(0000.0000*kvarh)
6.8.2*12(0000.0000*kvarh)
6.8.2&12(0000.0000*kvarh)
6.8.2*00(0000.0000*kvarh)
6.8.2*00(0000.0000*kvarh)
6.8.3(0000.0000*kvarh)
6.8.3*12(0000.0000*kvarh)
6.8.3&12(0000.0000*kvarh)
6.8.3*00(0000.0000*kvarh)
6.8.3*00(0000.0000*kvarh)
6.8.0(0000.0004*kvarh)
6.8.0*12(0000.0004*kvarh)
6.8.0&12(0000.0000*kvarh)
6.8.0*00(0000.0000*kvarh)
6.8.0*00(0000.0000*kvarh)
7.8.1(0000.0000*kvarh)
7.8.1*12(0000.0000*kvarh)
7.8.1&12(0000.0000*kvarh)
7.8.1*00(0000.0000*kvarh)
7.8.1*00(0000.0000*kvarh)
7.8.2(0000.0000*kvarh)
7.8.2*12(0000.0000*kvarh)
7.8.2&12(0000.0000*kvarh)
7.8.2*00(0000.0000*kvarh)
7.8.2*00(0000.0000*kvarh)
7.8.3(0000.0000*kvarh)
7.8.3*12(0000.0000*kvarh)
7.8.3&12(0000.0000*kvarh)
7.8.3*00(0000.0000*kvarh)
7.8.3*00(0000.0000*kvarh)
7.8.0(0000.0000*kvarh)
7.8.0*12(0000.0000*kvarh)
7.8.0&12(0000.0000*kvarh)
7.8.0*00(0000.0000*kvarh)
7.8.0*00(0000.0000*kvarh)
8.8.1(0000.0000*kvarh)
8.8.1*12(0000.0000*kvarh)
8.8.1&12(0000.0000*kvarh)
8.8.1*00(0000.0000*kvarh)
8.8.1*00(0000.0000*kvarh)
8.8.2(0000.0000*kvarh)
8.8.2*12(0000.0000*kvarh)
8.8.2&12(0000.0000*kvarh)
8.8.2*00(0000.0000*kvarh)
8.8.2*00(0000.0000*kvarh)
8.8.3(0000.0000*kvarh)
8.8.3*12(0000.0000*kvarh)
8.8.3&12(0000.0000*kvarh)
8.8.3*00(0000.0000*kvarh)
8.8.3*00(0000.0000*kvarh)
8.8.0(0000.0000*kvarh)
8.8.0*12(0000.0000*kvarh)
8.8.0&12(0000.0000*kvarh)
8.8.0*00(0000.0000*kvarh)
8.8.0*00(0000.0000*kvarh)
1.6.0(2.3966*kW)(21-01-03 11:45)
1.6.0*12(2.3939*kW)(20-12-31 20:15)
1.6.0&12(0.0000*kW)(00-00-00 00:00)
1.6.0*00(0.0000*kW)(00-00-00 00:00)
1.6.0*00(0.0000*kW)(00-00-00 00:00)
2.6.0(0.0000*kW)(00-00-00 00:00)
2.6.0*12(0.0001*kW)(20-12-30 16:13)
2.6.0&12(0.0000*kW)(00-00-00 00:00)
2.6.0*00(0.0000*kW)(00-00-00 00:00)
2.6.0*00(0.0000*kW)(00-00-00 00:00)
83.8.1(0000.4450*kWh)
83.8.1*12(0000.1108*kWh)
83.8.1&12(0000.0000*kWh)
83.8.1*00(0000.0000*kWh)
83.8.1*00(0000.0000*kWh)
83.8.4(0000.2163*kWh)
83.8.4*12(0000.0540*kWh)
83.8.4&12(0000.0000*kWh)
83.8.4*00(0000.0000*kWh)
83.8.4*00(0000.0000*kWh)
83.8.2(0000.0000*kWh)
83.8.2*12(0000.0000*kWh)
83.8.2&12(0000.0000*kWh)
83.8.2*00(0000.0000*kWh)
83.8.2*00(0000.0000*kWh)
83.8.5(0000.0000*kWh)
83.8.5*12(0000.0000*kWh)
83.8.5&12(0000.0000*kWh)
83.8.5*00(0000.0000*kWh)
83.8.5*00(0000.0000*kWh)
83.8.20(0004.4504*kWh)
83.8.20*12(0001.1089*kWh)
83.8.20&12(0000.0000*kWh)
83.8.20*00(0000.0000*kWh)
83.8.20*00(0000.0000*kWh)
83.8.19(0000.0216*kWh)
83.8.19*12(0000.0054*kWh)
83.8.19&12(0000.0000*kWh)
83.8.19*00(0000.0000*kWh)
83.8.19*00(0000.0000*kWh)
18.128(0000.0028*kWh)
18.128*12(0000.0002*kWh)
18.128&12(0000.0000*kWh)
18.128*00(0000.0000*kWh)
18.128*00(0000.0000*kWh)
28.128(0000.0101*kWh)
28.128*12(0000.0016*kWh)
28.128&12(0000.0000*kWh)
28.128*00(0000.0000*kWh)
28.128*00(0000.0000*kWh)
12.7.128(00.009)
11.7.128(00.013)
C.2.0(00000004)
C.2.1(20-12-30 16:14)
C.2.2(20-12-29)
C.6.0(000155*h)
C.6.3(6.5*V)
C.7.1(00000001)
C.7.2(00000000)
C.7.3(00000000)
C.7.0(00000009)
C.8.0(00008151*min)
C.8.0*12(00002435*min)
C.8.0&12(00000517*min)
C.8.0*00(00000000*min)
C.8.0*00(00000000*min)
C.8.1(00007930*min)
C.8.1*12(00002214*min)
C.8.1&12(00000296*min)
C.8.1*00(00000000*min)
C.8.1*00(00000000*min)
C.8.2(00000000*min)
C.8.2*12(00000000*min)
C.8.2&12(00000000*min)
C.8.2*00(00000000*min)
C.8.2*00(00000000*min)
C.8.3(00000221*min)
C.8.3*12(00000221*min)
C.8.3&12(00000221*min)
C.8.3*00(00000000*min)
C.8.3*00(00000000*min)
32.7.0(236.9*V)
52.7.0(238.1*V)
72.7.0(237.4*V)
31.7.0(03.47*A)
51.7.0(03.31*A)
71.7.0(03.43*A)
91.7.0(00.33*A)
14.7(49.97*Hz)
32.32.0(0001)(00-01-01 00:09)
52.32.0(0001)(00-01-01 00:09)
72.32.0(0001)(00-01-01 00:09)
32.36.0(0001)(20-12-30 16:24)
52.36.0(0001)(20-12-30 16:24)
72.36.0(0001)(20-12-30 16:24)
81.7.0( 0*Deg)
81.7.1( 120*Deg)
81.7.2( 240*Deg)
81.7.4( 14*Deg)
81.7.5( 129*Deg)
81.7.6( 254*Deg)
0.2.7(B21)
C.2.7(00-00-00)
13.7.0( 0.976)
13.0.0(0.976)
13.3.1(0.975)(21-01-01 02:45)
C.8.5(00000000*min)
C.8.5*12(00000000*min)
C.8.5&12(00000000*min)
C.8.5*00(00000000*min)
C.8.5*00(00000000*min)
1.8.5(0000.0000*kWh)
1.8.5*12(0000.0000*kWh)
1.8.5&12(0000.0000*kWh)
1.8.5*00(0000.0000*kWh)
1.8.5*00(0000.0000*kWh)
2.8.5(0000.0000*kWh)
2.8.5*12(0000.0000*kWh)
2.8.5&12(0000.0000*kWh)
2.8.5*00(0000.0000*kWh)
2.8.5*00(0000.0000*kWh)
!
�:
Looks ok but I am not sure that the 2.8.5*12 or the 2.8.5&12 value representation is part if the IEC 62056-21 standard.
from iec62056-21.
dawidce
commented on May 28, 2024
Hi,
thank You very much. It solved my problem. Case closed 👍
from iec62056-21.
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