B&B Electronics CL256 RS-232 to Current Loop Converter

The B&B Electronics CL256 is a passive RS-232 to current loop interface converter designed to extend serial communications over longer distances and provide noise-immune data transmission. Current loop interfaces are commonly used in industrial environments where reliable, long-distance serial communication is required between computers, terminals, printers, and other RS-232 devices.

Key Features:

• Converts RS-232 signals to 20mA current loop for extended transmission distances
• Passive design requires no external power supply — powered directly from RS-232 control lines
• Supports both active and passive current loop configurations
• Provides electrical isolation to protect equipment from ground loops and transients
• Compatible with standard RS-232 serial ports (DB-25 or DB-9 interfaces)
• Compact and rugged construction suitable for industrial environments

The CL256 is an ideal solution for integrating legacy current loop equipment with modern RS-232 serial ports, enabling continued use of older terminals, printers, and industrial controllers without costly hardware replacement.