use growatt2mqtt on classic arduino

[geimel]

Hi, I've found your great project and will use a part of your code on a arduino nano, to display the data on a oled display. Yesterday I've received my MIC 1500TL-X, I have connected the RS485A1 and B1 to an usb-rs485 convertert, I've send several requests (read input an holding register) but get absolutely no answer. Is it possible to help me with an example complete modbius request message, so I can send this over a terminal an check the connection. (the RS485A2 B2 port works well, here I can see the requests of the inverter to smartmeter after activating this, so I think the USB Converter works) Thanks a lot Richard

[nygma2004]

OK, so you have connected the inverter with your laptop with a usb-rs485? What program do you use to read data? What do you mean that you get nothing?

[geimel]

there is no response from the MIC when I send a query

[nygma2004]

Well, it is hard to tell from here. Few obvious questions:

• MIC is running/powered?
• Did you set the communication to 9600 baud, 8, N, 1? Slave ID = 1? Did you pick the correct COM port?
• Try swapping the A and B wires
• The USB and serial is close to the inverter?
• You are reading input registers, right?
• You are reading a few, like address 0 quantity 5?

[geimel]

Well, it is hard to tell from here. Few obvious questions:

* MIC is running/powered?

* Did you set the communication to 9600 baud, 8, N, 1? Slave ID = 1? Did you pick the correct COM port?

* Try swapping the A and B wires

* The USB and serial is close to the inverter?

* You are reading input registers, right?

* You are reading a few, like address 0 quantity 5?

All above = yes. I think it is a hardware defect :-(

[nygma2004]

That is also possible. It would be a good idea to test with another USB to RS485 adapter.