Model: DDU-24/26
Doc. Ref. no. : - m06bom101
Issue no. 09
Page 40 of 51
User’s Manual
7. OPERATION INFORMATION
7.1 Operation as Time/Date Display [DDU-24/26]
1. Insert the power cord into an appropriate connector inside the clock.
2. Upon Power up of DDU-24/26, The Unit display Slave id Then if unit is wireless input model then it
display the RF receive channel and transmit channel that you are set. Then it will start displaying
time/date from internal RTC otherwise it will start displaying time/date from internal RTC. After
synchronization with master clock, it will take & display the time/date of master device. DDU-24/26
clock will start display RF receive channel 0 and then start from 00:01:00 and 01/01/15, during first
time Power ON & run on internal RTC until synchronizes with master clock. if unit is NTP or NTP +
PoE input model then it will start displaying time/date from internal RTC.
3.
RS232/485 Signal as Input:
There is auto frame detection mode is given in DDU-24/26, so no configuration is required for frame
input selection. Connect a source of Serial Communication of GPS to the input serial connector of
DDU-24/26. The time should appear on the display within 60 seconds of application of time code. If
the time code signal is lost or disconnected, then DDU-24/26 will continue to display time based on
its internal RTC, until the time code signal is returned.
4.
Wireless Input:
Set RF receive channel in DDU-24/26, on which channel Wireless master transmitting the time
code signals. You can set receive channel between 0-9 and auto. Auto option will scan
automatically on which channel wireless transmitter transmitting the time code frames.
If Unit Sync in Auto mode then after power off and on it will display RF receive channel which
unit previous lock in auto mode
.
DDU-24/26 will catch the signal from around 100 meters area with obstacles in case of master to
slave communication or 50 meters in case of DDU-24/26 to DDU-24/26 slave communication.
DDU-24/26has option of Re-transmission of received signals, set RF transmits channels
between 0 to 9, and DDU-24/26 will transmit the received signals on set channel, for increasing
the Range. If you do not want to re-transmit then set no option in RF-T key configuration menu.
For Wireless Input Refer
[see Communication Guidelines Section]
5.
ETHERNET as Input:
Connect the RJ-45 cross cable between Ethernet port of DDU-24/26 & NTP Server. Ethernet Client
settings for DDU-24/26 will be done by telnet.
Open the Telnet configuration window as explained in Section 6.2.4 of Configuration. Now Enter
the I.P. address of NTP time source Server[Primary and secondary server], MASK, Gateway,
and
Query interval time, Query request time out, Query Retry time , Number of time out
counts
before switching servers from which you want to take reference time. After configuration
close the Telnet window.
DDU-24/26 will first send query to the primary NTP server (@ every
Query interval time
) for
Time code if it get response it will Lock on primary NTP server, but till the set time of Request
time out it does not get response, it again send query to the primary NTP server after Retry
Interval time, DDU continues try to send query after every Request time out + retry time, up to
set number of counts before switching servers, after it DDU shows Unlock indication on the
display for set Query interval time & after that time it will send Query to secondary NTP server
when Secondary Server Option For NTP is Enabled for Time frame, if it gets Query reply from
Secondary NTP server than it will get lock,
While synced with secondary NTP server DDU will send Query primary NTP server 6 seconds
before set query interval time & wait 1 second for NTP query reply
If there is no reply from Primary than after 2 seconds it will send query to secondary NTP server.
Above Primary NTP server availability check will happen before every scheduled query interval
time
If it get NTP query reply from primary NTP server than it will shift on Primary Server with Lock
condition & start working continuously on primary NTP server
On availability of both NTP Servers , DDU gives priority to Primary and make the query after
ever set Query Interval time , on not availability of Primary NTP Server , it shift on Secondary
Server and continuously check for primary NTP server.
