... bus, which is fast(12 times as RS485), distant(8 times as RS485), CRC checksum, and strong in hardware arbitration ... , error correction and real time. (RS485 has no function of arbitration, error correction, and checksum.)9 ... Prompt, Intercom, Parking Space Display,Middle Distance Card Reader, Long Distance Card Reader, Plate Number Recognition,Red & Green Lights, Heating ...