Thank you for choosing our RS232 to RS485 Passive Bidirectional Converter. This converter is compatible with RS-232 and RS-485 standards, and can convert single-ended RS-232 signals into balanced differential RS-485 signals. The communication distance can reach 1.2 kilometers. Built-in TVS, support 600W anti-surge and 15KV electrostatic protection, driven by RS-232 charge pump, it can be turned on without external power supply. The built-in zero-delay automatic transceiver conversion I/O circuit can automatically control the data flow without any handshake signal. Application Fields: This product is suitable for industrial automation control systems, all-in-one cards, access control systems, consumer systems, attendance systems, parking lot systems, self-service banking systems, bus toll systems, highway toll station systems, etc. Note : In the case of insufficient power supply, the active RS485 converter DTE (Data Terminal Equipment) needs to be replaced Model and Standard Product Name: RS232 to RS485 passive two way converter Specification: DB9 female (threaded) / RS485, black Interface Characteristics: Compatible with EIA / TIA's RS-232C and RS-485 standards Working Mode: asynchronous half-duplex differential transmission Transmission Rate: 300bps to 115.2Kbps Transmission Medium: twisted pair wire (wire diameter Plus/Minus 0.5MM) or shielded wire Transmission Distance: RS485 end is less than 1200 meters; RS232 end is less than 15 meters Safety Protection: RS485 interface 60OW lightning surge protection per line Working Environment: -20 to +70 degrees Celsius, relative humidity 5 percent to 95 percent Delivery List RS232 to RS485 passive bidirectional converter * 1