Feature: 1. Adopted of high quality electronic components, and accuracy process, ensure for the durability 2. This converter is compatible with RS-232C and RS-485 standards 3. It converts single-ended PS-232 signals into balanced RS-485 differential signals and extends communication distance to 1.2 kilometre 4. The converter is passive and does not require an external power supply 5. Widely used in industrial automation, canteen sales systems, employee attendance management, highway toll stations, etc. Specification: Condition: 100% Brand new Item Type: Converter Adapter Interface: EIA/TIA compatible RS-232C standard and RS-485 standard Electrical Interface: RS-232 is a DB9 female (hole), RS-485 is a 4-bit terminal Working Mode: Asynchronous, half duplex. Differential transmission Transmission Medium: Twisted pair or shielded twisted pair Communication Rate: 300-115200bps Size: Approx. 57 x 37 x 17mm / 2.2 x 1.5 x 0.7in Working Environment: 2-50℃, relative humidity 5%-95% (commercial working environment is 0-70℃), (industrial working environment is -20-85℃) Communication Distance: 1200 meters (RS-485 end), 5 meters (RS-232 end) Package List: 1 x Converter Adapter