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Current Loop to Serial RS-232/422/485 Converters
Current Loop to Serial RS-232/422/485 Converters

Current Loop to Serial RS-232/422/485 Converters

Current Loop to Serial RS-232/422/485 Converters. Current loop devices use current on or current off to transmit binary digits. B&B converters interface RS-232 and RS-422/485 systems to the most common current loop ports, 20 mA ports with open circuit voltages up to 30 V. Many models can be modified for higher loop currents and voltages. Call B&B Electronics’ Technical Support Department for details. High speed optical isolators couple and isolate transmit and receive data. All B&B current loop converters have a transmit (T+ and T-) and a receive (R+ and R-) loop. Each loop may be operated as an active or passive loop. When the converter needs to provide the loop current, a 12 VDC power supply is required for the current loop side. Maximum baud rate recommended for current loop converters is 19.2 kbps.

  • All models are optically isolated
  • Designed for 20 mA Digital Current Loop. Inquire about other values
  • Maximum baud rate: 19.2 kbps

Models 232CL4R is a port powered RS-232 to current loop converter. No external power required for passive loop installations. A power supply is required to generate an active loop. Model 232PCLR is an RS-232 to current loop converter that requires a power supply for the RS-232 side of the converter. Model 232CLDR is a DIN Rail mountable, wide temp version for industrial applications.


These units are DIGITAL Current Loop, NOT for ANALOG Current Loop (0 to 20mA or 4-20mA)

Model Number RS-232/422 Connector Current Loop Converter Power Source for RS-232/485 Downloads
232CL9R
DB9 Female Terminal Block Port powered
232CL4R
DB25 Female Terminal Block Port powered
232PCLR
DB25 Female DB25 Male -
485CL
Terminal Block DB25 Female -