Glossary
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SICAM I/O Unit, 7XV5673, Device Manual
E50417-H1040-C484-A3, Edition 05.2012
RS485
Interface standard for digital, wire-based, differential, serial data transmission
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
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 hierarchy of NTP
servers polled by the device. The best stratum is 1, each further 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 networks.
T
TCP/IP
T
ransmission
C
ontrol
P
rotocol/
I
nternet
P
rotocol: Family of network protocols
U
UDP/IP
U
ser
D
atagram
P
rotocol/
I
nternet
P
rotocol: Family of network protocols
UTC
U
niversal
T
ime
C
oordinated: Universal time standard referred to the time at the
prime meridian
MAN_SICAM_IO-Unit_7XV5673_US.book Page 223 Thursday, May 10, 2012 10:59 AM