Mitsubishi D720s Manual

[Pelagio Bosch]

Froma quick overview of the manual ( , BTW you should have provided that link!) it seems that the inverter is the ModBus RTU protocol on the RS-485 bus (4-wire variant). So you should get a 4-wire RS-485 shield or breakout (I know only of 2-wire variants commercially available) and use one of the ModBus libraries available.

Please allow me the question: Do you really know what you're doing? This inverter is for handling high voltages and judging from your post it doesn't seem that you have experience with that. There is a high risk of hurting yourself.

thank you for your reply and concern , i know that it has a little risk, what i want to do is to control the speed of a motor via vdf and arduino, i did an experience with the potentiometer and it work, what i want is if there's a way to do that from arduino directly without using the potentiometer ? (because i notice that the mitsubishi can read the pression value from a nanometer , so i could simulate that value with arduino analogue signal output)

The RS485 board behind the link is not suitable for this inverter because it only supports 4-wire RS485 (fullduplex) and this board is a normal 2-wire variant (half-duplex). I found a shield that does support fullduplex communication but only with RJ-45 connectors on it:

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