SRIO 500M Data Communication and Reporting Unit User Manual

This document is a user manual and technical description for the SRIO 500M, a data communication and reporting unit that serves as the master unit of the SPA bus within the SPACOM system. It details the unit's features, including host interface protocols (ANSI X3.28 and SACO 100M), event logging, data acquisition, serial interfaces, and technical specifications for connecting to host computers and slave devices like protective relays.