RS232/RS485 (Recommend Standard 232/Recommend Standard 485) integrated interface circuit

The utility model discloses an RS232/RS485 (Recommend Standard 232/Recommend Standard 485) integrated interface circuit. The interface circuit comprises a magnetic isolating circuit, an RS232/RS485 signal selection circuit, an RS485 direction control circuit, an RS232 receiving and transmitting circuit and an RS485 receiving and transmitting circuit. The interface circuit is provided with a receiving port, a transmitting port and a direction control port which are respectively connected with the magnetic isolating circuit, a receiving line and a transmitting line going out of the magnetic isolating circuit are both connected with the RS232 receiving and transmitting circuit and the RS485 receiving and transmitting circuit, the signal selection circuit is used for selecting an RS232 signal or RS485 signal received by a system, and the RS485 signal is controlled by hardware auto reversing. The integrated interface circuit has stable data, convenient operation and simple wiring without onsite jumper meditation or dial-up switch and without software control.