The RCM-O, RCU-O and RCX series units are rack level PDUs with circuit monitoring via a built-in web server. In the RCX series, built-in sensors monitor Voltage, Current, instantaneous and cumulative Power, as well as calculated Power Factor., also reserves the right to substitute or terminate distribution of this document, with no obligation to notify any person or party of such substitutions or terminations. Page 6 · Geist will work with our direct suppliers to identify purchased components and. Below you will find brief information for rack power distribution units RCX, rack power distribution units RCO, rack power distribution units RCM-O. Manuals and User Guides for Geist RCX. High-quality materials and robust product designs ensure a reliable connection, signal transmission and power.