B&B Electronics CL28 Current Loop to RS-232 Serial Converter

The B&B Electronics CL28 is a current loop to RS-232 converter designed to interface 20mA active and passive current loop devices with standard RS-232 serial equipment. This compact signal converter is ideal for connecting legacy industrial devices, terminals, and printers that use current loop communication to modern RS-232 serial ports.

Key Features:

• Converts 20mA current loop signals to RS-232 serial levels
• Supports both active and passive current loop configurations
• No external power supply required — powered directly from RS-232 control lines
• Compact, DIN-rail or panel-mountable housing
• Suitable for industrial environments and legacy serial communication applications
• Wide compatibility with terminals, printers, PLCs, and other current loop devices

The CL28 is a reliable solution for maintaining connectivity between older current loop serial devices and modern RS-232 equipment, extending the useful life of legacy industrial hardware without costly replacements.