Sanxing S12U16 1-phase electricity meters

[versed elk]

I have an electricity meter that seems to support DSMR and has an RJ-12 (P1 port) connector. Here's what it looks like:

I also have a USB adapter based on the FTDI232 chip.

Could you help me with the pin connection diagram to connect the USB adapter to the meter? I have RJ-12 connectors and all the necessary tools.
Additionally, I would like to integrate it into HomeAssistant (in my case, Yellow). Is it even possible to connect to such a meter?

I found the user manual for this electricity meter https://books.lauren.lv/read/752/pdf

[versed elk]

some one can help me? 🤗

[zenith turret]

do you really want to take the risk going DIY with this?

I would just get a pre-built USB -> P1 from ali, they're like 10 euro

[hollow glen]

there are two different P1 standards. This seems to be "DSMR P1 Companion Standard" which is documented here: https://www.netbeheernederland.nl/sites/default/files/2024-02/dsmr_5.0.2_p1_companion_standard.pdf

There are also some meters that use the term "P1 Port" and also use rj12 connector, but in reality they use m-bus signalling on pins 3 and 4.

these readers are powered from the meter, so no extra power supply (possibly except when doing firmware updates). they are completely local, with a web interface as well as mqtt support where you can select between multiple mqtt formats. one of them is explicitly for home assistant.

For the DSMR P1 Companion standard: https://lectronz.com/products/pow-p1-reader-for-power-meter-with-p1-port

For the "other" P1 variant, and for those in the nordics using RJ45 M-bus connection: https://lectronz.com/products/pow-u-han-port-reader-for-m-bus-meters-esp32

I use the Pow-U myself

[versed elk]

@zenith turret There is no problem to buy an adapter for 10 euros. I am going to do it. But I want to be sure that it will fit and I will be able to use it.
And what are the risks?

I also read that this port can be deactivated by the owner.

@hollow glen And how do I know which one to take?

[hollow glen]

if it really follows the "DSMR P1 Companion Standard" then the Pow-P1 should be the right one. you could always email the seller ( https://www.amsleser.no/contact-us ) and ask if your meter is known to either work or not work.

i can say that this thing was incredibly easy to set up. just remember that you should upgrade the firmware while you set it up and have it running from usb power. the latest firmware (that i need to upgrade to soon) claims to fix the need for external power while upgrading firmware as well. so this will be my last time hauling a battery bank up to my fuse box to upgrade the reader 😄

if you (like me) are on spot pricing you can even set this little thing up to get spot prices from nordpool daily and compute energy prices for you

this is the local dashboard on the device itself

and this is the device in home assistant

so it is a bit pricier than a $10 adapter, but it may give you a lot more with less work. i had bought the parts and started writing code to decode my meter when i came upon this 😄

[zenith turret]

The USB to P1 is plug and play

The AliExpress one I mean, not the DIY

DSMR integration is pretty solid

[versed elk]

I bought such an adapter Domoticz on Raspberry FTDI USB TTL P1. I don't really know what the difference is between the "colors" (in the picture)
I connected it to my meter and to the HA yellow I installed the DSMR Smart Meter add-on. But I don't receive any data. How else can I check?

[zenith turret]

If you connected with USB you need the dsmr integration, not the addon.

It should show up in the list of usb devices

When you configure the integration

[versed elk]

I have installed this one.

[versed elk]

Anyone have an idea?

[cinder narwhal]

Do you get data from the meter? Usually port needs to be enabled by the electricity provider

[versed elk]

No, I don't get anything.
I have doubts about the port, I already wrote about it above. So, I need to call the provider.
Than u.

[cinder narwhal]

I just got HomeWizard P1 meter last week. I was able to open the p1 port on the electricity company web portal, took 2 hours it to open. Plugged in that device and HA found it automatically. 100% would recommend.

https://www.homewizard.com/fi/kauppa/wi-fi-p1-meter/