International Electrotechnical Commission <br/><br/>
IEC: 870-5-1 - 1990-02; Telecontrol equipment and systems Part 5: Transmission Protocols. Section one - transmission frame formats 

 - 1.0 
 - Geneva  International Electrotechnical Commission  1990 
 - 79 
<br/><br/> Taken print out from CD 
<br/><br/><label>Universal Decimal Class. No.: </label> /