4-ports PCI to RS485 Multi-Serial Port Card with ESD protection. Hardware Interface:Connection Type: DR44 female head x 1Bus: 32 bit Universal PCISignal: RS-485 Data+(A) Data-(B) GNDTransmission rate: 300bps-921.6KbpsData bits: 5,6,7,8Stop bit: 1,1.5,2Check bit: None Even odd Space MarkFlow control: RTS/CTS XON/XOFFOperating Temperature: -40℃~85℃Interface protection: 600W surge protection per line for RS-485 interface,±15K V static protectionTran..