DLMS Python - How to pass selected object?

By nhzq , 24 December, 2020

Forums

Gurux.DLMS

Hi, I have a question. I want to get data from this OBIS - 1.0.15.6.0.255 class 4.

Command:
python main.py -h 153.121.114.08 -p 5 -a Low -P 31323435 -t Verbose -r ln -c 20 -s 255 -g 1.0.15.6.0.255:4

It seems the command printed all the data. Is that the right command to use?

Thank you in advance.

Hi,

Application reads first the association view. Saving association to the file makes reading faster. You can do it adding o- parameter. Like this:

-o meter.xml

BR,
Mikko

Hi,

Thank you for your response. I tried the -o parameter like this :

python main.py -h 153.121.114.08 -p 5 -a Low -P 31323435 -t Verbose -r ln -c 20 -s 255 -v "1.0.1.9.0.255" -o meter.xml

But it printed all the data. Can you help how can I get specific result based on OBIS?

Image

Hi,

You need to use -g parameter to read one value, not -v.

-g 1.0.1.9.0.255:2

Something like this:

BR,
Mikko

Hi,

I ran the command and got this error.

DisconnectRequest
TX: 18:42:07 7E A0 08 02 FF 29 53 DD 46 7E
RX: 18:42:10 7E A0 08 29 02 FF 73 39 50 7E

Traceback (most recent call last):
File "C:\Users\mnoor\Desktop\Python\Gurux.DLMS.Python\Gurux.DLMS.Client.Example.python\main.py", line 105, in main reader.readAll(settings.outputFile)

File "C:\Users\mnoor\Desktop\Python\Gurux.DLMS.Python\Gurux.DLMS.Client.Example.python\GXDLMSReader.py", line 518, in readAll self.getAssociationView()

File "C:\Users\mnoor\Desktop\Python\Gurux.DLMS.Python\Gurux.DLMS.Client.Example.python\GXDLMSReader.py", line 498, in getAssociationView self.client.parseObjects(reply.data, True, False)

File "C:\Users\mnoor\AppData\Local\Programs\Python\Python39\lib\site-packages\gurux_dlms\GXDLMSClient.py", line 728, in parseObjects objects = self.parseLNObjects(data, onlyKnownObjects, ignoreInactiveObjects)

File "C:\Users\mnoor\AppData\Local\Programs\Python\Python39\lib\site-packages\gurux_dlms\GXDLMSClient.py", line 754, in parseLNObjects raise Exception("Invalid structure format.")

Exception: Invalid structure format.

What does it mean by invalid structure format? Thank you

Hi,

Your meter is returning invalid data when the association view is read. If you add -t Verbose parameter and add trace here, I can check what is the problem.

BR,
Mikko

Hi,

I ran this command:
python main.py -h 183.171.144.38 -p 5 -a Low -P 31323435 -t Verbose -r ln -c 20 -s 255 -o meter.xml

Trace:
7E A0 21 29 02 FF 73 CC 61 81 80 14 05 02 01 20 06 02 01 20 07 04 00 00 00 01 08 04 00 00 00 01 0B C9 7E

Thank you

Hi,

This is a meter SNRM reply, but I need all the messages that the client and meter send to solve this.

BR,
Mikko

Hi,

Please refer the log here:
https://github.com/nhzq/dlms-invalid-structure-format/blob/main/logfile…

Thank you very much

Hi,

There is data missing from the meter reply. There is an Array tag, but the action data is missing.
You need to ask the meter manufacturer to fix this. These are the last bytes from the last PDU from the meter.

0204
12 0046 //Object type
1100 //Version
0906000060030AFF //LN
0202//Structure
0104//Attribute access rights for four attribute.
02030F01160100
02030F02160100
02030F03160100
02030F04160300

01 //Method access right list tag. Data is missing.

All other objects' action data is coming as expected. It's only missing from the last object.

BR,
Mikko