B&B Electronics CL225 RS-232 to 20mA Current Loop Converter

The B&B Electronics CL225 is a passive RS-232 to 20mA current loop converter designed to extend serial communications over longer distances or interface modern RS-232 equipment with legacy 20mA current loop devices. Current loop signaling is highly resistant to electrical noise and signal degradation, making it ideal for industrial environments and long-distance data transmission.

Key Features:

• Converts RS-232 signals to and from 20mA current loop (active or passive)
• Passive design — draws power directly from the RS-232 port, no external power supply required
• Supports full-duplex serial communication
• Extends transmission distances beyond the typical RS-232 limit
• Compact DIN-rail or desktop-friendly form factor
• Compatible with a wide range of serial devices and host systems
• Rugged construction suited for industrial and commercial applications

The CL225 is well-suited for connecting PLCs, data terminals, printers, and other legacy equipment that rely on current loop interfaces. Its passive, bus-powered design simplifies installation by eliminating the need for additional power wiring.