Trouble controlling the H100 Inverter using RS485 Protocol

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I was following this video 

how to control VFD (Variable Frequency Drive) inverter by KC868-COLB - YouTube

And wrote this code to control my H100 Inverter ( How to: H100 VFD & 1.5KW Air-Cooled Spindle Setup - Zhong Hua Jiang - How To - Carbide 3D Community Site)

import serial

def calculate_crc(data):
    reg_crc = 0xFFFF
    for byte in data:
        reg_crc ^= byte
        for _ in range(8):
            if reg_crc & 0x0001:
                reg_crc = (reg_crc >> 1) ^ 0xA001
            else:
                reg_crc >>= 1
    return reg_crc

# RS485 port settings
rs485_port = 'COM12'
rs485_baud_rate = 115200
rs485_parity = serial.PARITY_NONE
rs485_stop_bits = serial.STOPBITS_ONE
rs485_data_bits = serial.EIGHTBITS

try:
    # Open the RS485 serial port
    ser = serial.Serial(
        port=rs485_port,
        baudrate=rs485_baud_rate,
        parity=rs485_parity,
        stopbits=rs485_stop_bits,
        bytesize=rs485_data_bits,
        timeout=1
    )

    # Send a command via RS485 in RTU mode
    command = [0x64, 0x01, 0x02, 0x20, 0x00, 0x00, 0x01, 0x43, 0xCA]  # Modify the command in hexadecimal format
    crc = calculate_crc(command)
    command.append(crc & 0xFF)  # Low byte
    command.append((crc >> 8) & 0xFF)  # High byte
    ser.write(bytes(command))

    # Read the RS485 response
    response_rs485 = ser.readline()
    hex_response_rs485 = ' '.join(hex(byte) for byte in response_rs485)
    print("RS485 Response:", hex_response_rs485)

    # Close the RS485 serial port
    ser.close()

except serial.SerialException as e:
    print("Error opening or accessing the serial port:", str(e))

This is the code I wrote. The checksum passes, and everything else is fine. But when I run the code, it doesn't reflect any changes on the Inverter/ Motor. Please help.

The connections on the RS485 can be found in the images attached below.

Please help! Thanks in advance.