M
ODULE
B
EHAVIOUR
N
ETWORK
T
IME
C
LIENT
8029NTC
4985LAN Large Matrix Display 4985 - V08.00
20 / 84
hopf
Elektronik GmbH
Nottebohmstr. 41
• D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: [email protected]
4
Module Behaviour Network Time Client 8029NTC
This chapter describes the behaviour of the module in special operational phases and
conditions.
4.1 Boot Phase
The boot process of the Network Time Client 8029NTC starts after turning on the system or a
reset.
During the boot process the Module 8029NTC boots the operation system and is therefore not
available via LAN.
The end of the boot process is reached when the LED test of the Status-LEDs in the front
panel has been finished.
Boot phase takes approx. 35 seconds by using static IP-addresses for
ETH0 and ETH1. Boot phase can be extended, depending on the network
configuration in use (e.g. DHCP).
4.2 Regulating Phase
After the boot phase, the NTP service is started automatically.
After starting the NTP service, the device will take about 5-10 minutes, depending on the
accuracy and availability of the time servers configured in the card, to regulate the internal
clock.
4.2.1 NTP Adjustment Process (NTP/Stratum/Accuracy)
NTP is a regulation process. After starting the NTP services, automatically processed during
booting, the Network Time Client 8029NTC requires approximately 5-10 minutes depending
on the accuracy and accessibility of the NTP Server parameterized in the module.
After a successful adoption of time by the NTP Server the module usually takes on a Stratum
value one less than the respective NTP Server (e.g. Server = Stratum 1
Stratum of the
Client Module = 2).
For an output of time via the module, the NTP service needs to be regulated to an accuracy
value = HIGH. The duration of the regulation process depends on factors such as accessibility
and accuracy of the respective NTP Server (System Peer).
4.3 Reset Button
The Network Time Client 8029NTC can be reset by the Reset-(Default) Button behind the front
panel of the board. The Reset-(Default) Button is accessible with a thin objective through the
small drilling in the front panel.
The button triggers different functions depending on how long it is pressed:
Duration
Function
< 1 sec.
No action
1 - 9 sec.
After releasing a
hardware reset
is triggered in the module
>= 10 sec.
After releasing a
FACTORY DEFAULT
followed by a
REBOOT
is
triggered after approx. 10 seconds