Hoping to get some help on setting up a NodeMCU (esp8266) with this 1 arduino library to control a Variable Frequency Drive (VFD).
I'm afraid to say that I almost need help from square one, as I'm completely new to the modbus protocol, and both the library and the VFD are (to my newbie brain atleast) very lacking.
What I have done so far is get a Node MCU and a MAX485 module hooked up, and connected it to the RS485 terminals on the VFD.
However, the only documentation that the VFD provides is the following (see screenshot). I understand that I need to somehow structure this in a Modbus RTU call as a hex value, but I honestly do not know where to even begin.
All I want to be able to accomplish is to set the frequency, and then start and stop. Potentially read a few values such as current draw, but thats overkill for now.
I'm also not attached specifically to this library, its just what I found that was compatible with ESP8266. I also have ESP32s if thats a better / easier option.
Apologies for the severe lack of actual progress here, but really hoping someone more clever than myself can help here.