Brand AP-LINK Model ap-oo1 Material Aluminum Quantity 1 Color Black + silver Product Size 6.2 x 3.3 x 1.6cm Operating Temperature 10~55'C Operating Humidity Other Compatible w/ RS-232C RS-485 standard of EIA / TIA ; Electric interface: RS-232C interface w/ DB9 mode RS-485 DBP pin; Working method: asynchronous half-duplex; Transmission media: Common cable twisted cable or shield cable; Transmission speed: 300~115200BPS; Transmission distance: 5m (RS-232) 1200m (RS-485); Signal: RS-232: TXD RXD RTS CTS DTR DSR DCD GND; Convenient to use; Strong drive ability; Multi-protection for communication port; Can convert single-ended signal of RS-232 into balanced half-duplex signal of RS-485; Can get power directly from RS-232 port; Auto-control transmitting data; Full surge protection assuring whole RS-485 safety; Widely used in industrial automation and control system access control system parking lot system self-service system bus fee system toll station system etc. Packing List 1 x Converter 1 x Chinese user manual