Eastron Energy SDM220 Meter - EmonTX Direct Pulse Counting?

@whitecitadel wrote:

So, I picked up an Eastron SDM220-Pulse energy meter from China:
Aliexpress SDM220-Pulse link

Which is a DIN rail mounted power meter, I see some people in Europe are using the 3-phase versions for their monitoring but using the RS485 output. I bought the Pulse version, which looks to have the RS485 actually there but not labelled - RS485<-> USB interface in the post at the moment to test that theory.

It looks to reading this manual I found that it has a passive pulse output, so I feed in voltage and count the pulses out.

Reading the wiki page for optical sensors (now linked thanks!) page it would seem that I can just connect:
SDM220 Port 5 (Pulse -ve) = EmonTX Terminal 2 (3.3v)
SDM220 Port 4 (Pulse 1 +ve) = EmonTX Terminal 4 (IRQ1)

And I can then count 1/1000 imp/kWh like I would with an optical sensor - is anyone using the counting like this and confirm - or anyone with more experience than me on the EmonTX point out if I got this wrong?

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