TLC485 change TD and RD RS-232 lines to RS-485 signals. All are port powered and feature Automatic Send Data Control. SDC automatically enables the RS-485 driver when data is present on the RS-232 side. Control of the driver is automatic at rates up to 115.2 kbps.It is used widely in the field of electricity, industrial automatic control, IC card billing system. It is a high quality, economical data interface conversion product. Features Plug and play, small volume, easy installation Convert RS-232 data transmit (TXD) and data receive (RXD) signal into balance half duplex RS-485 signals. Powered from RS-232 handshake lines — no power supply needed! Point to multiple point Automatic Send Data Control - no software drivers needed! Communication Standard Accord EIA RS-232, RS-485 standard RS-232 signal TX, RX, GND RS-485 signal D+, D-, GND Working Asynchronism, point to point or multi point, 2 wire half-duplex Direction Automatic send data control, auto distinguish and sense direction adout data transfer Band rate 300-115200bps, auto sense serial signal rate Loading Support 32 point loopback (can order 128 point) Transmission RS-485 side 1200M(9600bps), RS-232 side less than 5M Port protection 600W surge protection, 15KV static protection Interface style RS-232 side DB-9 female, RS-485 side 4 terminal block Enviroment Working temperature -40 to 80 Storage temperature -40 to 85 Humidity Relative humidity 5% to 95% Power Input powered No power supply needed,powered from TXD, RTS, DTR signal in RS-232 port Consumption Static consumption less than 10mA, dynamic consumptionless than 40mA Dimension L*W*H 90mm*33mm*16.5mm Shell Plastic Color White Weight 40g