ICP DAS USA ICP-I-7520 Isolated RS-232 to RS-485 Serial Converter with Din Rail Mount.

Easy-to-use Isolated RS-232 to RS-485 Converter (RoHS): Input : RS-232 Female 9-pin Connector; Output : RS-485 Protocol (two wire, D+, D-). Fast Data Transmission Speed: Automatic RS-485 Direction Control, Transmission Speed of up to 115200 bps, Auto Switching Baud Rate, Self-Tuner Asic Inside. Safe and Flexible: 3000 VDC Isolation Protection on the RS-232 side, ESD Protection for the RS-232/485 Data Line. Strong Communication Capabilities: Supports Maximum of 256 modules in a single RS-485 network without using a repeater; Supports Maximum of 2048 modules in a single RS-485 network when using a repeater. Fits Easily with Applications of Any Scale: Supports Wide Operating Temperature of -25 °C ~ +75 °C (-13F ~ 167F). Din Rail Mountable and Easy to Set up.