Hi I'm trying to get my arduino to communicate with my VFD via modbus 485 protocol but dont know how to do this. i need help from simple wiring to a sample program sketch.
This is what i need to send to set up frequency:
7) Example 1: Write 30.00Hz to inverter of 0l
Sent data: O1H 02H 03H 00H 0BH B8H 7FH 0CH
but i dont know how to write it into the modbus line.
i checked out this: https://sites.google.com/site/jpmzometa/arduino-mbrt/examples but those examples are too complicated i need something simple.
i'm using this as converter from rs-232:
Thanks for any help