100% brand new and high quality Introduction: Compatible with RS232 and RS485 standards,the converter adopts RS232 and RS485 dedicated conversion chips, no need to install drivers. It can convert RS232 signals into RS485 signals with a transmission distance of up to 1200 meters. External 9V power supply, internal zero-delay automatic switching transceiver circuit, does not require any handshake signal, so the upper program does not need any changes. Only need to connect TXD, RXD, GND three signals to work. Features: Designed according to the concept of industrial control standard, the power supply is completely isolated. Super anti-interference ability, long communication distance, high speed and stable operation. Professional interface data flow automatic control technology, automatic identification and control of data transmission direction. Widely used in the attendance machine, ICCard charging system, Industrial automation control system, access control system, parking lot system, automatic bank system, bus charging system, canteens Shoufan system, highway toll station system. Converter only, other accessories demo in the picture are not included Specification: Specification: US Type: Converter Interface: Compatible with RS232 and RS485 Standards Electrical Interface: RS232 Female Base, RS485 Terminal Binding Post Working Mode: Asynchronous Half-duplex Differential Transmission Baud Rate: 300bps-115200bps Transmission Medium: twisted pair Input Power: DC 9-12V Power Consumption: 0.15W Operating Environment: -10-60, Relative Humidity 10% -90% (No Condensation) Converter Color: Black Dimension: 10.2x8.5x2.4cm/ 4.02x3.35x0.95in Quantity: 1 Set Note: 1.No retail package. 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 Pc x Converter 1 Pc x Cable 1 Pc x Charger 1 Pc x Manual