The 2500C-RADP-RS485 is an RS485 RBC Adapter which allows a Texas Instruments Series 500 I/O base to function as a slave node on an RS-485 Remote I/O channel. Designed to fit Series 500 I/O bases, this module includes an integrated RS485 Remote Base Controller, allowing you to modernize your Series 500 system without a complete system replacement. You can immediately replace a failed Series 500 RS485 RBC with a reliable CTI 2500 Series® equivalent. Note that this module cannot be reused in a CTI 2500 Series® Classic or Compact Base.