Et112 over ethernet (Internet) tcp

Hi Folks,

Not sure if this is the correct section, however I've been looking for energy monitoring solution.

My solar system is in a shed 100m away (lots of digging). I have ethernet for Internet but need Internet so can't use ethernet for rs485 alone and power lines obviously run to the shed. Therefore I needed a way to send load energy meter data to multiplus ii in shed.

I have 100a supply and didn't fancy the added cost of the ethernet supported meter with ct clamp (which I found very painful to even find where to buy in the UK)

I therefore took a risk with the et112 and two rs485 to eth adapter from waveshare (I purchased them on pihut)

They're quite cheap feeling and the Official name is RS485 TO ETH (B).

The setup being one rs485 to eth setup as a client the other as a server.

Et112 rs485 -> RS485 to eth client device in consumer unit - > Internet

-> rs485 to eth server device in shed - > rs485 to usb to raspi/multiplus

Just wanted to share as the rs485 to eth were £20 each so much cheaper than ethernet meter.

It also doesn't require installing custom firmware/drivers ie what some folk seem to have done to get other brand ethernet meters to work ie shelly 3m. Which was more daunting for me to attempt.

Any questions give me a shout

Thanks,

Matt

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eureka commented · Mar 02 at 10:14 AM

Hi @matt1309 , Got the same setup here (Barn is closer to the house), also with 2 waveshare devices. They connect (LED is blue) but CerboGX is not seeing the ET112. Have a 3 wire connection on both sides.(Ground, A and B). Did I miss something?

0 ·

1709374387842.png (103.3 KiB)

matt1309 eureka commented · Mar 02 at 10:49 AM

Hi @Eureka

I'd test it using a computer with the carlo galvazzi software if I were you. You can then at least confirm it's not the gx.

I maybe also check you've got the rs485 to usb adapter wired up correct (A and B the right way around). Testing with carlo galvazzi software will prove/disprove this.

Maybe try enabling no data restart. And making the numbers quite small. Found this helps with reliability.

As I can't spot anything there.

Here's my settings just incase they're useful. For both client and server

Server

Client

Hope this helps

screenshot-20240302-104602.jpg (300.1 KiB)

matt1309 commented · Mar 03 at 09:38 PM

Hi @Eureka

Ahh that's the issue. I have a server and a client. One at meter end one at gx end. You can maybe use one device but youd need to edit the modbus layout to mimic a modbus meter like the em24. Or write a custom driver on gx device to read that device

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Et112 over ethernet (Internet) tcp

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