B&B Electronics CL31 RS-232 to Current Loop Converter

The B&B Electronics CL31 is a passive RS-232 to 20mA current loop interface converter designed for connecting RS-232 serial devices to equipment using the 20mA current loop standard. This compact converter bridges the gap between modern RS-232 serial ports and legacy industrial equipment, enabling reliable data communication without requiring an external power supply.

Key Features:

• Converts RS-232 signals to 20mA current loop (active or passive loop configurations)
• Supports full-duplex serial communication
• Passive design — powered directly from the RS-232 interface lines, no external power required
• Compact, inline form factor for easy installation
• Compatible with a wide range of serial baud rates
• Ideal for connecting to legacy industrial terminals, printers, and instrumentation
• Rugged construction suitable for industrial environments

The CL31 is a dependable solution for facilities needing to maintain communication between RS-232 host systems and 20mA current loop peripheral devices. Its passive, self-powered design simplifies installation and eliminates the need for separate power supplies or adapters.