title: SCADA Protocol - iec-104
body: <p>I am researching the IEC 60870-5 family protocols and in particular IEC-101 and IEC-104, for a university project.
  Although purchasing the IEC-101 and IEC-104 standards, i am still left with fundamental questions that i can't seem to find answers for using Google. 
  I am now focusing on understanding every Type Identification - its purpose, what its use, how to use it and draw a simple flow of each.
  The standards doesn't supply the necessary information about the commands. 
  Can anyone refer me to some website where these things are explained or any forum where i can ask question about these standards?</p>
  
  <p>Any help is appreciated. </p>