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In order to facilitate with different standard serial interface of computer, external device or intelligent instrument for remote data communication, mutual conversion must be standard serial interface. The converter is compatible with RS-232, RS-485 standard, can convert the RS-232 signal single end balanced differential RS-485 signal, the communication distance of RS-232 converter can be extended to 1.2 km, no external power supply adopts the unique "RS-232 charge pump" drive, don't need to initialize the RS-232 serial port can obtain the power supply, a zero delay automatic transmit receive switching, automatic control and data flow direction of I/O circuit is unique, without any handshake signals (such as RTS, DTR etc.), so as to ensure that the RS-232 prepared in half duplex mode programs running in RS-485 mode without changes, ensure appropriate existing software and hardware interface, converter transmission rate 300-115.2Kbps. can be used in between, the main control machine control and single chip computer or peripheral constitute a point-to-point, point to multipoint remote multi computer communication network, realize multi machine response communication. Widely used in industrial automation control system, smart card, access control system, parking lot system, self-service banking system, the bus fee system, the dining hall meal selling system, employee attendance management system, highway toll station system etc..