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Glossary
259
SICAM MMU 7KG9663, Device Manual
E50417-H1040-C514-A3, Edition 01.2016
M
MAC-Address
M
edia
A
ccess
C
ontrol address: Hardware address that clearly identifies the
device on the network.
MBAP
M
od
b
us
A
pplication
P
rotocol
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 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
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
PIXIT
P
rotocol
I
mplementation e
X
tra
I
nformation for
T
esting
R
Response time
Time the output needs to react to a signal change at the device input. Time
measured from an instant change at the AC input until the corresponding
change of a DC output quantity has reached 90% of its final value.
RJ45
Ethernet plug connector
RTC
R
eal-
T
ime
C
lock
RTU
See Modbus
R
emote
T
erminal
U
nit
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
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-
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.
SICAM-MMU_7KG9663_US.book Page 259 Monday, December 7, 2015 12:22 PM