How to read KWH meter EDMI MK7MI using RS-232 port

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By hasan nasha , 28 July, 2022
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General discussion

Hello

I'm trying to read EDMI ATLAS MK7MI using RS-232 port. Information from brochure this meter using DLMS IEC62056 protocol in all ports including RS-232. But other EDMI ATLAS line up using 'EDMI Command Line' ex. MK10E which i can understand this protocol.

My Question is, what protocol is used by MK7MI in RS-232 port. And what steps to connect meter using DLMS protocol with Gurux DLMS Director via RS-232 port.

Thanks.

Kurumi

4 years 1 month ago

Hi,

I know that the all meter versions don't support DLMS. If I remember right the optical port is supporting only IEC 62056-21. You need to ask the meter vendor if your meter is supporting DLMS.

You can read more about the differences between IEC 62056-21 and DLMS here:
https://www.gurux.fi/DLMSCOSEMFAQ

BR,
Mikko

hasan nasha

4 years 1 month ago

Thanks for your reply.

I ask vendor and he clarify that meter only support IEC 62056-21.
And i try to connect meter via rs232 port with IEC 62056-21 frame command. I send "/?!\r\n" and i receive the same command that i send past. I managed to try other baudrate, parity, and stop bits, but same same as before. Do i have a wrong step?

Thanks

i try using rs485 because in facsheet this meter supports rs232/rs485. I got response from meter, but not same with iec 62056-21 data frame. is it posible EMDI use own iec 62056-21?

Image

Kurumi

4 years 1 month ago

Hi,

There are some variations between IEC 62056-21, but it seems like your meter is sending readout for /?!\r\n. What you need to do is read data until you receive 0xD 0xA.

In readout there are some current values that you can parse.

I hope this will help you. It's for Elster, but the idea is the same.
https://www.gurux.fi/node/5415

BR,
Mikko