ABB RELION 620 Series Operation Manual page 149

1MAC456939-IB D
620 series ANSI
Operation Manual
LCT Life cycle traceability
LED Light-emitting diode
LHMI Local human-machine interface
MAC Media access control
MMS 1. Manufacturing message specification
2. Metering management system
Modbus A serial communication protocol developed by the Modicon
company in 1979. Originally used for communication in
PLCs and RTU devices.
Modbus ASCII Link mode using 7-bit ASCII characters
Modbus RTU Link mode using 8-bit binary characters
Modbus TCP/IP Modbus RTU protocol which uses TCP/IP and Ethernet to
carry data between devices
NCC Network control center
PA Polyamide
PBT Polybutylene terephthalate
PC 1. Personal computer
2. Polycarbonate
PCM600 Protection and Control IED Manager
PRP Parallel redundancy protocol
R/L Remote/Local
RAM Random access memory
RJ-45 Galvanic connector type
RoHS Restriction of hazardous substances
ROM Read-only memory
RS-232 Serial interface standard
RS-485 Serial link according to EIA standard RS485
RSTP Rapid spanning tree protocol
RTC Real-time clock
RTD Resistance temperature detector
Rx Receive/Received
SAN Single attached node
Section 9
Glossary
141