B&B Electronics CL218 RS-232 to Current Loop Converter

The B&B Electronics CL218 is a passive RS-232 to 20mA current loop interface converter designed for connecting serial devices that use current loop signaling to standard RS-232 ports. Current loop interfaces were widely used in industrial terminals, teletypewriters (TTY), and legacy serial equipment, and the CL218 bridges the gap between these older devices and modern RS-232 serial ports.

Key Features:

• Converts RS-232 signals to 20mA current loop and vice versa
• Passive design — draws power directly from the RS-232 port, no external power supply required
• Supports both transmit and receive current loop channels
• Compatible with active and passive current loop configurations
• Compact form factor for easy inline installation
• DB-25 or compatible connector interface for straightforward serial port connection
• Ideal for connecting legacy TTY and industrial terminal equipment to modern PCs and controllers

The CL218 is a reliable solution for maintaining connectivity with legacy serial and industrial equipment that relies on 20mA current loop communication standards. Its passive, self-powered design simplifies installation and eliminates the need for a separate power source.