
373
SICAM 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
R
emote
T
erminal
U
nit: Modbus protocol type for transmitting data
over serial networks (e.g. RS485)
Modbus TCP
Modbus
T
ransmission
C
ontrol
P
rotocol: Modbus protocol type for transmit-
ting data as TCP/IP packets; TCP port 502 is reserved for Modbus TCP.
MSB
M
ost
S
ignificant
B
it
MSV
M
ains
S
ignalling
V
oltage
N
NaN
N
ot
a
N
umber means "invalid": Result of an invalid computing operation
NTP
N
etwork
T
ime
P
rotocol: Standard for synchronizing clocks in computer sys-
tems using packet-based communication networks
P
PQ
P
ower
Q
uality
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
R
eal-
T
ime
C
lock
RTU
See Modbus
R
emote
T
erminal
U
nit
RVC
R
apid
V
oltage
C
hange
S
Server
Sends data upon request by the client
SNMP
S
imple
N
etwork
M
anagement
P
rotocol: Serves for monitoring and control-
ling network elements of a central station
SNTP
S
imple
N
etwork
T
ime
P
rotocol: Simplified version of the NTP
SW
S
oft
w
are: 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
S
hielded
t
wisted-
p
air 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-