© MOBATIME 39 / 120 800652.11
6.5.9 NTP slave clocks / Time zone server
NTP slave clock line for operating slave clocks on the LAN (Ethernet). With this clock
line, a world time function can be realized.
1. Mode of clock line: 0 = off, 1 = Send NTP multicast, 2 = Send NTP Multicast and
time zone table, 3 = Send time zone table, 4 = Time zones on request, 5 (only for
maintenance) = Send an empty time zone table and return to previous mode.
2. Multicast adress for NTP and time zone server: 239.192.54.x
Group address: x = 1..15 for MOBATIME devices, e.g. NCI, SEN 40.
3. Multicast port for time zone server (enter an arbitrary value, empty is not allowed !
Value e.g.: 65534). The port is also needed for requesting Time zone entries
(mode 4).
4. Poll-interval for NTP Multicast in 2^poll-values in seconds (range: 1 – 16).
E.g. poll-value = 2 interval: 2
2
= 4 sec., poll-value = 5 interval: 2
5
= 32 sec.
For redundant Multicast time servers see remark next page.
5. Packet time to Live (TTL) for NTP- and time-zone-Multicast-packets in hops.
(Number of Routers in a network to transfer the packets through; for simple network
without routing, enter value "1", for 1 Router enter "2").
6. Repeat time to send time zone table: 10 – 86400 sec.
7. Delay time between the sending of the individual time zone entries (one entry per
Multicast packet) of the table: 1 – 60 sec.
8. Configuration of individual time zone entries. Displays menu “TIME ZONE TABLE“.
Important:
Changes of multicast-address, pollinterval and TLL lead to a restart of the
NTP server!
Important:
For the operation of a Multicast communication (NTP and Time Zone
Server) the configuration of a gateway is required (see chapter 6.5.23
Network). The gateway can be set manually or by using DHCP.
If no gateway is available, the own IP can be set as gateway.
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