ABB Protect IT REL 501 2.5 Series Operator's Manual page 13

6
Introduction to the operator's manual
5,6&
506 YDOXH
56
56
56
578
6$
6&6
606
63$
69&
73= 73< 73; 736
8,3,6$
87&
9
:(,
97
;
Reduced instruction set computer
Root mean square value
A balanced serial interface for the transmission of digital data in
point-to-point connections
Serial link according to EIA standard RS485
A generic connector specification that can be used to support
RS422, V.35 and X.21 and others
Remote terminal unit
Substation Automation
Station control system
Station monitoring system
Strömberg Protection Acquisition, a serial master/slave protocol for
point-to-point communication
Static VAr compensation
Current transformer class according to IEC
Process interface components that delivers measured voltage and
current values
Coordinated Universal Time. A coordinated time scale, maintained
by the Bureau International des Poids et Mesures (BIPM), which
forms the basis of a coordinated dissemination of standard fre-
quencies and time signals
Same as RS449. A generic connector specification that can be
used to support RS422 and others
Week-end infeed logic
Voltage transformer
A digital signalling interface primarily used for telecom equipment
&KDSWHU 
,QWURGXFWLRQ