263SENTRON PAC5100/5200, 7KM5212/5412, Device Manual
E50417-H1040-C568-A1, Edition 03.2015
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 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
RTC Real-Time Clock
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.
Subnet mask Bit mask in the network protocol that defines how many IP addresses the
computer network encompasses. Together with the IP address of a device,
the subnet mask defines which IP addresses the device searches in its own
network and which IP addresses it tries to reach via routers in other net-
works.
T
TCP/IP T
ransmission Control Protocol/Internet Protocol: Family of network proto-
cols
U
UTC Universal Time Coordinated: Universal time standard referred to the time at
the prime meridian
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