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I think you need pin 6 & 8 (RS485A). On the NodeMCU just follow the labeling on the board itself, so the pins top right that have the GPIO5 & GPIO4 labels in your image.
I have the inverter without wifi module so this project is perfect for me.
Thanks for making it possible.
I have some issues.
![Screen Shot 2020-12-26 at 15 29 14](https://user-images.githubusercontent.com/76620545/103153224-595b8e80-478f-11eb-9980-e8dbf4f2adc5.png)
First I can't figure out witch of these wires of my inverter going to the "TTL to RS485" board.
Second
How should the LEDs on the TTL board blinks? My RX is steady and my TX flashes for every 10 seconds I think
Last:
![NodeMCU-V3-2](https://user-images.githubusercontent.com/76620545/103153470-fa971480-4790-11eb-85f7-a7e6a93dcee4.jpg)
Which pins are the right ones on the NodeMCU boards?
The label on the boards says D1 and D2 but I'm not sure.
Sorry for all the noob questions but I don't know where else to go.
Best regards
Soren
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