... to RS232 Converter 1.Small volume, easy installation 2.No power supply needed, plug and play USB232 USB smart adapter ... DTR, DSR, DCD, RI, GNDWorking formatAsynchronism, point to pointBaud rate300-115200bps, automatic sense serial signal rateTransmissionRS232 side ... maleEnvironment Working temperature-20 to 60Storage temperature-25 to 85HumidityRelative humidity 5% to 95%PowerInput poweredNo power ...