B&B Electronics CL243 RS-232 to Current Loop Converter

The B&B Electronics CL243 is a passive RS-232 to 20mA current loop interface converter designed to extend serial communication distances and connect modern RS-232 equipment to legacy current loop devices. Current loop interfaces were widely used in industrial environments before RS-232 became standard, and the CL243 bridges that gap reliably without requiring an external power supply for signal conversion.

Key Features:

• Converts RS-232 signals to 20mA current loop (active and passive transmit/receive)
• Passive design — powered directly from the RS-232 signal lines, no external power required
• Supports full-duplex communication
• Compatible with standard DB25 RS-232 serial ports
• Industrial-grade construction suitable for demanding environments
• Compact form factor for easy integration into existing serial communication setups

The CL243 is ideal for connecting serial terminals, printers, and industrial controllers that use 20mA current loop interfaces to RS-232 host systems. B&B Electronics Manufacturing Company is a well-established manufacturer of serial data communications equipment trusted in industrial and commercial applications.