Telecontrol equipment and systems - - Part 5-101: Transmission protocols - Companion standard for basic telecontrol tasks IEC 60870-5-101/A1 /  
 IEC 60870-5-101/A1 
ISO, IEC. 
 - First edition. 
 - Geneva :   ISO :   IEC,   2000. 
 - 41 stron ;   30 cm.