309SICAM P850/P855, 7KG85xx, Device Manual
E50417-H1040-C482-A6, Edition 10.2018
M
MAC-Address Media Access Control address: Hardware address that clearly identifies the
device on the network.
MBAP Modbus Application Protocol
MBAP Header Header of a Modbus TCP message consisting of these 4 parts: Transaction
identifier (2 bytes), protocol identifier (2 bytes), length (2 bytes), unit identifier
(1 byte).
MIB Management Information Base: Information which can be retrieved or mod-
ified via the SNMP network management protocol
Modbus The Modbus protocol is a communication protocol based on a client-server
architecture.
Modbus RTU Modbus Remote Terminal Unit: Modbus protocol type for transmitting data
over serial networks (e.g. RS485)
Modbus TCP Modbus Transmission Control Protocol: Modbus protocol type for transmit-
ting data as TCP/IP packets; TCP port 502 is reserved for Modbus TCP.
MSB Most Significant Bit
N
NaN Not a Number means "invalid": Result of an invalid computing operation
NTP Network Time Protocol: Standard for synchronizing clocks in computer sys-
tems using packet-based communication networks
P
PQ Power Quality
R
RJ45 Ethernet plug connector
RS485 Interface standard for digital, wire-based, differential, serial data transmis-
sion
RTC Real-Time Clock
RTU See Modbus Remote Terminal Unit
S
Server Sends data upon request by the client
SNMP Simple Network Management
Protocol: Serves for monitoring and control-
ling network elements of a central station
SNTP Simple Network Time Protocol: Simplified version of the NTP
SW Software: Program executed on a computer
STP Shielded twisted-pair is the cable for 100Base-T (Ethernet)
Stratum Each NTP server is synchronized by a high-precision time standard or by
another NTP server. The stratum is the position of the NTP server in the hi-
erarchy of NTP servers polled by the device. The best stratum is 1, each fur-
ther level in the NTP server hierarchy increases the stratum by 1.
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