1. Working Principle: The converter can convert the TXD and RXD signals from the RS232 serial port into two-wire balanced half-duplex RS485 signals. 2. Simple Operation: No external power supply is required; you can directly draw power from pin 3 of the RS232 port while requesting to send (RTS) on pin 7 and data terminal ready (DTR) on pin 4 to supply extra power to the converter. Resetting, hardware, and installation are very easy to use. 3. Scope of Application: The converter for the bidirectional interface between RS232 and RS485 is used between the main control machines, and the main control machine and the microcontroller or peripherals form a point-to-point, point-to-multipoint remote communication network for multiple machines to achieve multi-machine response communication. 4. Wide Use: Widely used in industrial automation control systems, one-card systems, access control systems, parking systems, self-service banking systems, bus charging systems, dining systems, company employee attendance management systems, highway toll station systems, and so on. 5. ABS Material: Exquisite and compact, easy to use and easy to carry. Made of high-quality, robust ABS material, wear-resistant and durable.