Siemens SICAM Q100 Device Manual page 373

MBAP Header
MIB
Modbus
Modbus RTU
Modbus TCP
MSB
MSV
N
NaN
NTP
P
PQ
R
Response timeout
RJ45
RS485
RTC
RTU
RVC
S
Server
SNMP
SNTP
SW
Software filter time
STP
Stratum
SICAM Q100, 7KG95xx, Device Manual
E50417-H1040-C522-A4, Edition 03.2018
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).
Management Information Base: Information which can be retrieved or mod-
ified via the SNMP network management protocol
The Modbus protocol is a communication protocol based on a client-server
architecture.
Modbus Remote Terminal Unit: Modbus protocol type for transmitting data
over serial networks (e.g. RS485)
Modbus Transmission Control Protocol: Modbus protocol type for transmit-
ting data as TCP/IP packets; TCP port 502 is reserved for Modbus TCP.
Most Significant Bit
Mains Signalling Voltage
Not a Number means "invalid": Result of an invalid computing operation
Network Time Protocol: Standard for synchronizing clocks in computer sys-
tems using packet-based communication networks
Power Quality
Time within which the Modbus slave has to respond to a request from Mod-
bus Master
Ethernet plug connector
Interface standard for digital, wire-based, differential, serial data transmis-
sion
Real-Time Clock
See Modbus Remote Terminal Unit
Rapid Voltage Change
Sends data upon request by the client
Simple Network Management Protocol: Serves for monitoring and control-
ling network elements of a central station
Simple Network Time Protocol: Simplified version of the NTP
Software: Program executed on a computer
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).
Shielded twisted-pair is the cable for 100Base-T (Ethernet)
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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