M-bus meter to UniPi?

Suntherm
Posts: 11
Joined: Mon Feb 22, 2016 11:40 am

M-bus meter to UniPi?

Postby Suntherm » Thu Mar 03, 2016 10:28 am

Hej team,

For our prototype setup, we need to read the status of 3 energy meters. 2 of them are communicating on m-bus, and the 3rd is communicating on RS485.

Can someone help me on how to connect the hardware to the UniPi?
- how to wire m-bus connectors (2 wires)?
- how to wire RS485?

I have some M-bus to TTL converters based on TI TSS721A M-bus transciever.

http://www.ti.com/product/TSS721A

Looking forward to hearing from you

best regards from Morten in Denmark
Morten Veis Donnerup

SUNTHERM
Innovative heating and storage system
tomas_hora
Site Admin
Posts: 298
Joined: Wed Oct 29, 2014 9:56 am

Re: M-bus meter to UniPi?

Postby tomas_hora » Thu Mar 03, 2016 2:11 pm

RS 485 can be easily done with USB->RS485 converter (also available in our shop)
However the m-bus is not that easy because the mbus master acts as a power supply for the meters to communicate, however there are mbus masters which you can interface using RS232
Suntherm
Posts: 11
Joined: Mon Feb 22, 2016 11:40 am

Re: M-bus meter to UniPi?

Postby Suntherm » Thu Mar 03, 2016 5:43 pm

Hej Tomas,

Thank you for your reply.

If I have this module:
http://www.cdiscount.com/informatique/c ... 55531.html

Would it not be possible for me to connect via UART, like described in this post:
http://electronics.stackexchange.com/qu ... rduino-rpi

How should I make MERVIS discover the MBUS connection on the UART?


rgs Morten:)
Morten Veis Donnerup

SUNTHERM
Innovative heating and storage system
tomas_hora
Site Admin
Posts: 298
Joined: Wed Oct 29, 2014 9:56 am

Re: M-bus meter to UniPi?

Postby tomas_hora » Fri Mar 04, 2016 8:21 am

I cannot confirm that your HW will work but in mervis, you can just create a new channel with Mbus protocol, configure it and then you should be good to go with detection of the sensors.

Actually I have not tried that because I do not have a mbus meter, so it would be great to share your experience.

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