0xA4 =0x80+0x24= slave is busy, EEPROM delay.
0xA5 =0x80+0x25= administrator restricted
0xA6 =0x80+0x26= set value is beyond limit.
0xA7 =0x80+0x27= CRC checksum error
0xA8 =0x80+0x28= frame format error
I-4-4. Register Address:
The register address includes two bytes, data setting is constituted by a two-byte.