JK BMS rj45 rs485 wiring for Sumry 3.8kw inverter

[Ash2022]

Hi all I have a Sumry 3.8kw 24v hybrid inverter from AliExpress, it looks similar to EASUN. It suppose rs485 BMS communication (not just for pc) using pylon or pace protocols, via a rj45 connector.

I'm having trouble wiring up my JK BMS I have the Pb series with interface board, rj45 plug in port 1 (closest port to LEDs).

I have tried wiring it as per my inverters pins as I understand you only need 3 pins, RS485A, RS485B and GND.

What is confusing me massively is JK BMS manual where it says pins 1,8 and 2, 7 for the coms... Then I read that JK do the pin numbers opposite to the standard way of reading them

Please can someone help explain which orientation the pin numbers run ref to the JK manual and why it says 4 pins when I only need an A and a B connection for rs485... Which pins do I need? A diagram with circles would be brilliant .

Thanks. I have attached my inverter manual page.

 

[kommando]

It has 4 pins when only 2 are needed as they are duplicated, the socket then can be used for daisy chain rs485. Pick either pair as both are connected.

 

[augiedoggy]

Has anyone gotten this to work? I have the generic victor nm 3.6kw version which is the same as the Sumry 3 6 inverter and I also am having a hard time finding the correct cable pinout for the pylon communication