6 System integration
6.1 Communication protocols
6.1.1 NTP
When enabled, the NTP (Network Time Protocol) service can use external time sources to synchronize
the device's system time. The NTP client service uses an Ethernet connection to connect to the NTP
time server. NTP can be enabled by setting the primary time server and the secondary time server
parameters to the address of the system's NTP time source(s).
Table. 6.1.1 - 341. Server settings.
Name
Range
Description
Primary time
server address
0.0.0.0...255.255.255.255 Defines the address of the primary NTP server. Setting this parameter at
"0.0.0.0" means that the server is not in use.
Secondary time
server address
0.0.0.0...255.255.255.255 Defines the address of the secondary (or backup) NTP server. Setting this
parameter at "0.0.0.0" means that the server is not in use.
Table. 6.1.1 - 342. Status.
Name
Range
Description
NTP quality for events
0: No sync
1:
Synchronized
Displays the status of the NTP time synchronization at the moment.
NO
NOTE
TE:: This indication is not valid if another time synchronization method is used
(external serial).
NTP-processed message
count
0...2
32
–1
Displays the number of messages processed by the NTP protocol.
Additionally, the time zone of the relay can be set by connecting to the relay and the selecting the time
zone at
Commands
→
Set time zone in AQtivate setting tool.
6.1.2 PTP
PTP, Precision Time Protocol, is a higher accuracy synchronization protocol for Ethernet networks.
Accuracy of microsecond level can be achieved.
In a PTP network the devices can have different roles. There is a Grandmaster clock that is the clock
source, normally connected to GPS. Normally the devices take the role of an Ordinary clock and
receives synchronization from the Grandmaster clock. In the PTP network there can also be Boundary
and Transparent clock roles, these are most often PTP enabled switches that can redistribute time or
compensate for their delays.
BMCA, Best Master Clock Algorithm, is an algorithm that PTP devices use to determine the best clock
source. This is utilized in network segments where there are 2 Grandmaster clocks or in situations
where there are no Grandmaster available. In these situations the devices make a selection which
device will act as the clock source. In these cases without GPS synchronized clock source, the
accuracy between the devices is still high.
Settings
Select PTP as the time synchronization source from Communication
→
Synchronization
→
General menu.
The following settings are available in
Communication
→
Synchronization
→
PTP menu.
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
423
Summary of Contents for AQ-M257
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