Using GuruxDLMS.c with arduino

By luffy , 27 January, 2020

Forums

Hello,

I need understanding and clarification regarding using the GuruxDLMS.c https://github.com/Gurux/GuruxDLMS.c with arduino.

I have used the Arduino_IDE example in the repo, but I am having a hard time to understand the working of the library.

My requirement is to read instantaneous Voltage, Current, and Power from the meter.

I am not able to figure out how to read these values using GuruxDLMS.c.

I have OBIS codes for these values as per Indian standards.

I need guidance on how to fetch these values from the meter

Thank you.

Hello,

DLMS is not easy protocol. Add and initialize register objects in same way that clock1 is added.
Then read values in loop.
Somethig like;
gxRegister r1;

void setup() {
bb_init(&frameData);
//Set frame size.
bb_capacity(&frameData, 128);
cl_init(&meterSettings, 1, 16, 1, DLMS_AUTHENTICATION_NONE, NULL, DLMS_INTERFACE_TYPE_HDLC);

cosem_init(BASE(r1), DLMS_OBJECT_TYPE_REGISTER, "OBIS CODE");

// start serial port at 9600 bps:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
}

void loop() {
int ret;
//Initialize connection.
ret = com_initializeConnection();
if (ret != DLMS_ERROR_CODE_OK)
{
return;
}
//Read register.
ret = com_read(BASE(r1), 2);
if (ret != DLMS_ERROR_CODE_OK)
{
return;
}
com_close();
}

BR,
Mikko

Hello,

Thank you for your prompt response.

- I am using low authentication
- com_initializeConnection return OK.

I tried reading current, voltage registers using the code sample you gave above.
- current: cosem_init(BASE(r1), DLMS_OBJECT_TYPE_REGISTER , "1.0.31.7.0.255")
- voltage: cosem_init(BASE(r1), DLMS_OBJECT_TYPE_REGISTER , "1.0.32.7.0.255")

Reading current, voltage returns DLMS_ERROR_CODE_UNAVAILABLE_OBJECT.

I tried reading profile generic( gxProfileGeneric ), but it also returns unavailable object.
- gxProfileGeneric p1;
- cosem_init(BASE(p1), DLMS_OBJECT_TYPE_PROFILE_GENERIC , "1.0.94.91.0.255")
- com_read(BASE(p1), 2)

Can you tell me what does this error code means ?

Thank you Again. :)

Hi,

If you want to use Low aithentication you need to change initial settings for the client.
Change this:
cl_init(&meterSettings, 1, 16, 1, DLMS_AUTHENTICATION_NONE, NULL, DLMS_INTERFACE_TYPE_HDLC);
to;
cl_init(&meterSettings, 1, 16, 1, DLMS_AUTHENTICATION_LOW, "YOUR PASSWORD", DLMS_INTERFACE_TYPE_HDLC);

You also need to change the client address from 16 (0x10) to example 32 (0x20). I don't know what meter you try to read, so I don't know the right value. Try to read the meter with GXDLMSDirector and copy the value from there.
BR,
Mikko

Hello,

I talked with the manufacturer, they gave me AARQ REQUEST bytes that should be sent:

7E A0 48 03 41 10 87 76 E6 E6 00 60 3A 80 02 02 84 A1 09 06 07 60 85 74 05 08 01 01 8A 02 07 80 8B 07 60 85 74 05 08 02 01 AC 0A 80 08 41 42 43 44 30 30 30 31 BE 10 04 0E 01 00 00 00 06 5F 1F 04 00 00 18 19 FF FF EB AB 7E

Can you tell me how on cl_init should be configured by this ?

Hi,

Change the password and all the settings are correct.

cl_init(&meterSettings, 1, 32, 1, DLMS_AUTHENTICATION_LOW, "ABCD0001", DLMS_INTERFACE_TYPE_HDLC);

BR,
Mikko

Hello,

This worked like a charm.

Thank you very much.

Thank you for decoding the binary stream for me.

Can you point be to the documentation so that I can understand the protocol or at least help me decoding this kind of DLMS binary stream ?

Thank you :)

Hi,

DLMS is a standard and it's very well documented.
There are several documents that you need to read.

• IEC 62056-21 Direct local data exchange
• IEC 62056-42 Physical Layer Services and Procedures for Connection-Oriented Asynchronous Data Exchange
• IEC 62056-46 Data link layer using HDLC protocol
• IEC 62056-47 COSEM transport layers for IPv4 networks
• IEC 62056-53 COSEM application layer
• IEC 62056-61 OBIS Object identification system
• IEC 62056-62 Interface objects
• India Standard 15959 (Part-1) 2011: Data exchange for electricity meter reading, tariff and load control: companion specification
• India Standard 15959 (Part-2) 2016: Data exchange for electricity meter reading, tariff and load control: companion specification part2 for smart meter
• Italy Standard UNI/TS 11291-11-2

BR,

Mikko

Hello,

Will read these spcifications.

Thank you very much.

Hello,

I am calling cl_init:
cl_init(&meterSettings, 1, 32, 1, DLMS_AUTHENTICATION_LOW, "ABCD0001", DLMS_INTERFACE_TYPE_HDLC);
in setup

and in loop I read 3-4 registers:
ret = com_initializeConnection(); // open conn
cosem_init(BASE(r1), DLMS_OBJECT_TYPE_REGISTER , OBIS_VOLTAGE_R); // read V(R)
ret = com_read(BASE(r1), 2);
cosem_init(BASE(r1), DLMS_OBJECT_TYPE_REGISTER , OBIS_VOLTAGE_Y); // read V(Y)
ret = com_read(BASE(r1), 2);
ret = com_close();

The problem arises from the second iteration of the loop.
The com_initializeConnection returns DLMS_ERROR_CODE_AUTHENTICATION_FAILURE
If I called cl_init again on every loop iteration, it works fine.

I wanted to ask if cl_init is required everytime before openning connection ?

Thank you.

Hi,

Example reset all client settings after the read. This is done to release all buffers.
Find com_close and comment cl_clear(&connection->settings);

Now you can connect as many times as you want to.

BR,
Mikko

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