BB-4WSD9TB
Change RS-232 TD and RD to RS-485 signalsExtend RS-232 data signals up to 1.2 km (4,000 ft.)AutomaticSend Data Control
Automatic Send Data ControlBaud rates up to 115.2 kbpsRS232portpowerorexternal12VDCpowerjackDipswitch selectable RS-422 o