The BB-485SD9R from Advantech is a compact, port-powered RS-232 to RS-485 converter, ideal for extending serial communication over long distances without needing an external power supply.

 Key Features

• Conversion: RS-232 TD/RD lines to RS-485 signals
• Connectors: Dual DB9 female ports
• Baud Rate: Up to 115.2 kbps
• Distance: Extends RS-232 signals up to 1.2 km (4000 ft)
• Power: Draws power from RS-232 handshake lines—no external supply required
• Automatic Send Data Control: Enables RS-485 driver only when data is present, eliminating the need for software drivers

 Electrical & Environmental Specs

• Isolation: Not specified (unlike BB-485DRCI which offers 3-way isolation)
• Operating Temp: 0°C to 70°C
• Mounting: Inline (DIN-rail adapter available separately)