... defined as multi-speed (15 different speed at most), switch among 4 accelerations and decelerations, UP/DPWM function, abrupt ... /Decelerations Time SettingThe frequency can be set via analog 0~10V, 0~20mA, operation key board, RS485 communication, UP/DOWN ... Modbus RS485 communicationFrequency SettingThe frequency can be set via analog 0~10V, 0~20mA, operation key board, RS485 communication, UP/DOWN ...