373SICAM Q100, 7KG95xx, Device Manual
E50417-H1040-C522-A4, Edition 03.2018
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
MSV Mains Signalling Voltage
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
Response timeout Time within which the Modbus slave has to respond to a request from Mod-
bus Master
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
RVC Rapid Voltage Change
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
Software filter time The software filter time has the effect that temporary switchover (L H, H
L) at the binary inputs is not detected as real switchover (debouncing).
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-
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