DLMS/COSEM on embedded systems

First of all, thanks a lot for your reply, really appreciate it!

I'll give you some details on what I need to do, this way you can have a better idea!

I already have a library (Supplied by the manufacturer) that allows us to connect to the meter and retrieve the data (for example, the reactive energy). The data we retrieve is in an array of bytes! So, what we need to do is to be able to decode the result into usable information (for example the kWh and the value of the scalar)!!

Do you guys have any pointers on how to best do this? Can the Java component help us do this?

thanks a lot

Elie

First of all, thanks a lot for your reply, really appreciate it!

I'll give you some details on what I need to do, this way you can have a better idea!

I already have a library (Supplied by the manufacturer) that allows us to connect to the meter and retrieve the data (for example, the reactive energy). The data we retrieve is in an array of bytes! So, what we need to do is to be able to decode the result into usable information (for example the kWh and the value of the scalar)!!

Do you guys have any pointers on how to best do this? Can the Java component help us do this?

thanks a lot

Elie

Hello,

Thanks a lot for your replies, here are some example of byte arrays:

A byte array in response of a get value on a register of class ID 3 (value attribute):
01000600000054

A byte array in response of a get value and scalar_enum structure on a register of class ID 3 (value attribute + scalar attribute):
020006000000540002020F00161E

Thanks again guys

Elie

I used icube's xml translator (http://www.cyamon.com/xmltranslator/xml_translator.html) and it worked (I only have to add the "0C" sequence at the beginning to indicate that it is a request response)!

I will try to use the DLMSDirector and get back to you

Elie

Why should it be 0xC4? I am not aware of the significance of this byte!

Here's my understanding of every byte:

0C : ReadResponse (this byte is not included in the array of bytes received)
02 : Response contains 2 elements
00 : First element Data
06 : First element type : Unsigned Integer32
00 00 00 54 : Value=84
00 : Second Element Data
02 : Second Element Type : Structure
02: Number of elements in the structure : 2
0F : First Element type = Integer8
00 : Value = 0
16 : Second element type = Enum
1E : Value = 30 (Wh)

I'm guessing that what is received is only the information contained in the register, everything else is stripped!

First of all, thanks a lot for your replies, and merry christmas to everybody.
Unfortunately, I was not able to test using the GXDLSDirector, I was not able to connect it to the meter (the physical connection to the meter was done via a RS485 to usb connector)

Anyways, the library that I use to connect to the meter, specifies the response(in ASN.1 format) as follows:

SEQUENCE OF Get_Data_Result
(1 per COSEM_Attribute_Descriptor)
Get_Data_Result ::= CHOICE {
data [0] Data,
data_access_error [1] IMPLICIT Data_Access_Result
}


where COSEM_Attribute_Descriptor is as defined in "COSEM application layer – IEC 62056-53"

Does this help? Can we use this to know how to decode the response which is given in a byte array format?

Thanks

Elie