B&B Electronics CL22 Current Loop to RS-232 Converter

The B&B Electronics CL22 is a passive current loop to RS-232 interface converter designed for connecting legacy current loop serial devices to modern RS-232 ports. This compact converter enables reliable communication between 20mA current loop equipment and standard RS-232 serial interfaces without requiring an external power supply.

Key Features:

• Converts 20mA current loop signals to RS-232 levels
• Passive design — draws power directly from the RS-232 port, no external power required
• Supports both active and passive current loop configurations
• Compact, inline form factor for easy installation
• Compatible with a wide range of serial devices including terminals, printers, and industrial equipment
• Rugged construction suitable for industrial environments

The CL22 is ideal for integrating older current loop peripherals — such as Teletype machines, industrial sensors, and legacy terminals — into contemporary RS-232 serial systems. Its passive, bus-powered design simplifies installation and eliminates the need for additional power wiring.