Communication circuit supporting RS485 half-duplex protocol and communication method

The invention discloses a communication circuit supporting an RS485 half-duplex protocol and a communication method. The communication circuit comprises a protocol controller, a first XOR gate circuit, a second XOR gate circuit, a transceiver and a driver, wherein a direction control port is used for controlling the transmission direction of a communication signal of the transceiver under an RS485half-duplex protocol, and a forward and reverse connection judgment port is used for performing XOR with a first port and performing XOR with a transmitting port so as to enable the signal to be overturned or unchanged. The communication method comprises the steps that the protocol controller receives a first communication signal from the first exclusive-OR gate circuit and sends the first communication signal to the second exclusive-OR gate circuit, so that the second exclusive-OR gate circuit determines a second communication signal and sends the second communication signal to the transceiver. Therefore, the commun