RS485 communication between AXL F RS UNI 1H and Growatt inverter MAX100-KTL3-X LV

PLCnext Engineer
1

Dear,
I’m using the RS uni 1H on a AXL F 2152 to communicate (read and write holding register 03) with several inverters. For now, I have 1 inverter connected of which I’m sure the RS485 connection is working. I tested this with the Gowatt Shinemaster.
On the RS uni LED 30 is steady on, led 00 comes up when a read request is send.
However, there is no response coming from the Growatt inverter.
Does anyone has an clue, or better, a working example for this communication?
I already tried the solarworx library, but also here no answer from the inverter.
Thanks in advance!

Tom

2

Hello Tom,

No example for the Growatt, but I am working on other inverter-type using the UNI AXL.
If you get no response light after a request has been made, then you can only check if the UNI block configuration has been set correct (9600 baud, parity NONE, 8 bits).
That the correct address is used for the inverter
That the correct Function Block is used (FC03 mostly) to read data.
Can you share the code and the spec that you are using to read data? I might give you some help with that.

Peter