B&B Electronics CL229 Current Loop to RS-232 Converter

The B&B Electronics CL229 is a passive current loop to RS-232 signal converter designed for connecting current loop serial devices to RS-232 ports. It provides a reliable interface between legacy 20mA current loop equipment and modern RS-232 serial ports without requiring an external power source.

Key Features:

• Converts 20mA current loop signals to RS-232 serial interface
• Passive design — no external power supply required
• Compatible with standard DB25 RS-232 serial ports
• Supports full-duplex communication
• Compact, inline form factor for easy installation
• Ideal for connecting legacy industrial and serial devices to modern computer interfaces

The CL229 is a practical solution for facilities that need to integrate older current loop serial equipment — such as terminals, printers, or industrial controllers — with contemporary RS-232-equipped computers and communication systems. Its passive, plug-and-play design minimizes installation complexity.