B&B Electronics CL288 RS-232 to Current Loop Converter

The B&B Electronics CL288 is a passive RS-232 to current loop converter designed to interface modern RS-232 serial ports with legacy 20mA current loop devices. This compact converter enables reliable serial communication between equipment that uses different electrical signaling standards, making it an essential tool for industrial environments and legacy system integration.

Key Features:

• Converts RS-232 signals to 20mA current loop and vice versa
• Passive design — powered directly from RS-232 control lines (no external power required)
• Compatible with standard DB-25 RS-232 serial ports
• Supports full-duplex (transmit and receive) current loop operation
• Compact, rugged housing suitable for industrial use
• Easy inline installation with no configuration or software required

The CL288 is ideal for connecting RS-232 host computers and terminals to printers, modems, PLCs, and other current loop peripherals. Its passive, plug-and-play design simplifies installation and eliminates the need for a separate power supply, making it a practical and cost-effective solution for maintaining legacy serial communication systems.