Profile: Polybus International, Inc. offers remote terminal units & front-end interface modules for both RTUs & PLCs. We design and manufacture bus structures including VME/VXI, IBM-PC, multibus and sun micro systems. Our designs include shock & vibration mounting, EMI/RFI protection and uninterrupted power systems for ground or air based applications. Our 19" 4U rack mount multi-system PC chassis is a support for up to four independent systems in one 4U chassis, field replaceable hot-swap redundant power supply, custom designed 3 slot PICMG backplane with onboard power switch and four easily-removable 3.5" drive brackets with shock-resistant design.