Siemens SIPROTEC 4 User Manual page 612

Default Settings and Protocol-dependent Functions
E.7 Protocol-dependent Functions
Type RS232
RS485
optical fiber
1) LWL = Lichtwellenleiter
612
RS485 Ethernet Ethernet TP RS485
TP
Ethernet
optical
fiber
RS485 Ethernet TP
optical optical Ethernet
fiber fiber optical fiber
(double (single
ring ring,
double
ring)
C53000-G1140-C207-8, Edition 08.2016
RS485 RS232
optical RS485
fiber
optical
fiber
SIPROTEC 4, 7SJ62/64, Manual