ABB Relion 615 series Applications Manual page 56

Section 6
Glossary
50
Modbus A serial communication protocol developed by the
Modicon company in 1979. Originally used for
communication in PLCs and RTU devices.
Modbus TCP/IP Modbus RTU protocol which uses TCP/IP and Ethernet
to carry data between devices
NPS Negative phase sequence
PCM600 Protection and Control IED Manager
RJ-45 Galvanic connector type
RTU Remote terminal unit
WAN Wide area network
WHMI Web human-machine interface
1MRS756885 A
REM615
Application Manual