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Reply: Strange readings from GW-DLMS via ModbusTCP
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Strange readings from GW-DLMS via ModbusTCP
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marcom
31 Aug 2018 14:37
Dear
usually this is a problem of bad modbus register reading; modbus addresses on the web pages are base 1, so if your modbus master/software is base 0 the correct address for your system is address -1. For example: 4x40016 -1 = 4x40015.
If this not solve, please try to swap words in modbus readings.
Regards
FR
30 Aug 2018 23:24
I'm trying to read values from a Landis+Gyr E650 using a GW-DLMS-485-LG. Unfortunately, I've got difficulties interpreting the values I receive using ModbusTCP. Some seem to be outdated and are never refreshed, some seem to be available at different addresses than the webinterface says. I've checked all values against the counter itself and the webinterface shows the correct values.
These are the (float) values from the top table (column ""website"" is value from website, column ""modbus"" is value as I polled it via ModbusTCP)
index
address
obis
website
modbus
0
4x40016
0.9.1
214724
246366
1
4x40018
0.9.2
180830
184589
2
4x40020
0.0.0
381197
327680
3
4x40022
0.1.0
75.00
75.03687286376953
4
4x40024
1.8.0
17929.44
17961.990234375
5
4x40026
1.8.0*
17705.99
17695.48046875
6
4x40028
1.8.1
12111.74
12156.8603515625
7
4x40030
1.8.1*
11964.86
11955.400390625
8
4x40032
1.8.2
5817.70
5805.1298828125
9
4x40034
1.8.2*
5741.13
5728.0
24
4x40064
5.8.0
2759.80
2755.2900390625
25
4x40066
5.8.0*
2739.29
2741.780029296875
26
4x40068
5.8.1
1546.89
1545.4000244140625
27
4x40070
5.8.1*
1537.40
1540.9000244140625
28
4x40072
5.8.2
1212.90
1209.8900146484375
29
4x40074
5.8.2*
1201.89
1200.0
54
4x40124
8.8.0
16.24
16.1299991607666
55
4x40126
8.8.0*
15.69
15.729999542236328
56
4x40128
8.8.1
15.23
15.242500305175781
57
4x40130
8.8.1*
14.68
14.642499923706055
58
4x40132
8.8.2
1.01
1.0099999904632568
59
4x40134
8.8.2*
1.01
1.0078125
64
4x40144
1.6.1
0.70
0.7015312314033508
65
4x40146
1.6.1*
0.68
0.6796875
As far as I can see, those values don't refresh at all (e.g. counter 4x40024) and/or don't fit to the data they should show (e.g. time 4x40016, date 4x40018)
The Integer variants are current, but seem to have an address offset of 2 bytes:
index
address
obis
website
value
4x41044
17929
0
4x41046
1.8.0
17929
17705
1
4x41048
1.8.0*
17705
0
2
4x41050
2.8.0
0
0
3
4x41052
2.8.0*
0
2759
4
4x41054
5.8.0
2759
2739
5
4x41056
5.8.0*
2739
0
6
4x41058
6.8.0
0
0
7
4x41060
6.8.0*
0
0
8
4x41062
7.8.0
0
0
9
4x41064
7.8.0*
0
16
10
4x41066
8.8.0
16
15
11
4x41068
8.8.0*
15
0
12
4x41070
3.8.0
0
0
13
4x41072
3.8.0*
0
0
14
4x41074
4.8.0
0
0
15
4x41076
4.8.0*
0
0
Do you have any idea what's wrong here and how it can be fixed? If you need further information for debugging this I'll be happy to assist.
