This is an EDMI
This is the serial number (SN: 215035119), and the handmade K Label is the multiplier of 160
The meter company should install this other kit on the meter which is known as the “SBS hub”. Often its in a sealed box.
The wiring of all the SBS hub should be as follows – with the key interface being the “Duo Bus Breakout Board”. They often get the patch leads wrong – so can be worth checking if it’s been done right.
The other key thing is that whole current EDMI meters should be of the “EEK” type – usually hand written on the “modbus DUO MD-SMP” device. Whole current meters say “ECR”. You should not mix the two up
The bit you need to plug into looks like this (the Duo Bus Breakout Board). It should have a Cat 5 lead already installed, but sometimes it doesn’t.
You can see here there is an RJ45 jack labelled ‘Modbus SW RS485’.
The pinouts on this are very particular:
The 2nd pin is negative
The 3rd pin is positive.
For most data cables this is the Green, and OrangeWhite (but check if it’s T568A or T568B)
Here’s an example of the wiring (a T568B type cable) straight from the SBS hub onto an RS485 transmitter:
However it gets to the Switchdin Droplet, you need to convert from RS485 to USB.
In this example, we used a D-Tech converter in a small Jbox and usually add a 120 Ohm resistor to minimise reflection noise. Note here we’ve changed the pair coming off of the other end of the wireless transmitter to a twisted pair (blue and bluewhite). we could have stayed with green and orangewhite but that causes more noise
Then plug the adapter into the droplet.