1 CHAPTER OVERVIEWThis product supports Substation Automation System (SAS), and Supervisory Control and Data Acquisition (SCADA)communication. The support embraces the evolution of communications technologies that have taken place sincemicroprocessor technologies were introduced into protection, control, and monitoring devices which are nowubiquitously known as Intelligent Electronic Devices for the substation (IEDs).As standard, all products support rugged serial communications for SCADA and SAS applications. By option, anyproduct can support Ethernet communications for more advanced SCADA and SAS applications.This chapter contains the following sections:Chapter Overview 305Communication Interfaces 306Serial Communication 307Standard Ethernet Communication 310Redundant Ethernet Communication 311Data Protocols 317Read Only Mode 358Time Synchronisation 360P24xM Chapter 16 - CommunicationsP24xM-TM-EN-2.1 305