SACO 148D4 Control Data Communicator with Event Annunciator Manual

This document describes the SACO 148D4, a control data communicator with an integrated event annunciator used as a substation-level master unit within the SPACOM secondary equipment system. It covers features such as duplex data communication, serial interfaces, self-supervision, and fiber-optic or electrical serial bus connections, along with detailed sections on operating principles, system layouts, programming, and technical data.