B&B Electronics CL239 RS-232 to RS-422/485 Isolated Converter

The B&B Electronics CL239 is an RS-232 to RS-422/RS-485 serial interface converter designed to extend serial communication distances and improve noise immunity in industrial and commercial environments. It provides reliable conversion between RS-232 signals and the differential RS-422/RS-485 bus standard, making it ideal for connecting legacy RS-232 equipment to modern RS-485 networks.

Key Features:

• Converts RS-232 signals to RS-422/RS-485 differential output
• Optical isolation protects connected equipment from ground loops and voltage transients
• Supports multi-drop RS-485 networks with up to 32 unit loads
• Extends communication distances up to 4,000 feet (1,200 m) over RS-422/485
• Wide baud rate support for flexible system integration
• Compact DIN-rail or panel-mountable form factor
• LED indicators for transmit and receive data activity

The CL239 is well-suited for industrial automation, process control, building management systems, and any application requiring reliable long-distance serial communication. Its plug-and-play design requires no external power supply, drawing power directly from the RS-232 host port.