B&B Electronics CL02 RS-232 to Current Loop Converter

The B&B Electronics CL02 is a passive RS-232 to 20mA current loop converter designed to bridge communication between RS-232 serial devices and current loop equipment. This compact interface converter is ideal for connecting legacy industrial devices, terminals, printers, and instrumentation that rely on 20mA current loop signaling to modern RS-232 serial ports.

Key Features:

• Converts RS-232 signals to 20mA current loop interface
• Passive design — powered directly from the RS-232 handshaking lines (no external power supply required)
• Supports full-duplex communication
• Compatible with standard DB-25 and DB-9 RS-232 serial ports
• Compact, inline form factor for easy integration
• Supports data rates typical of legacy serial applications
• Rugged construction suited for industrial environments

The CL02 is a reliable solution for facilities and technicians needing to maintain or integrate older current loop serial devices without replacing existing hardware. Its passive, self-powered design simplifies installation and eliminates the need for an additional power source.