Oh, sorry for my mistake! I understood my problem, now I need to buy a NS-Al002, convert RS232 9 pins to RS485.
And now I have a new question: if it's not the Yaskawa drive, may be INVT CHF100A, Mitsubishi FR700... , what should I do? Because I see in the system of communication setting, we set Host Type: varispeed / VS mini. It set for all Inverter drive, isn't it?
Thanks for your help!