System Time Message Format; Configure Ntp - Safran VersaSync User Manual

2.8 Configuring Network Settings
2.8.10.1

System Time Message Format

This message contains the time when the next 1PPS discrete will occur. It is sent
once per second prior to the 1PPS discrete.
Table 2-6:
Word
1
2
3
4
5
Table 2-7:
Data
Name
Message
ID
Message
Size
Seconds
NSec
EOM
It is also possible to use the System Time Message to send NMEA over UDP. For
more information about this functionality, see the
2.8.11

Configure NTP

Network Time Protocol (NTP) and Simple Network Time Protocol (SNTP) are cli-
ent- server protocols that are used to synchronize time on IP networks. NTP
provides greater accuracy and better error checking capabilities than SNTP does,
but requires more resources.
For many applications, it is not necessary to modify the NTP factory default con-
figuration settings. It is possible, however, to change most of the settings in order
to support specific NTP applications which may require a non- standard con-
figuration:
108
System Time Message format
Byte 3 Byte 2 Byte 1
Msg ID
Msg Size
Seconds
nSec
EOM
System Time Message field descriptions
Data Description
UID of the message; pro-
grammable
Total message size in bytes
Seconds since epoch
(00:00:00 Jan 1, 1970 UTC)
NSec within the current
second
End-of-message
Byte 0
Range Resolution
Unsigned 32 1
bit integer
Unsigned 32 1
bit integer
Unsigned 32 1
bit integer
Unsigned 32 1
bit integer
-1 1
NMEA over UDP App
CHAPTER
Units
n/a
Bytes
Seconds
nsec
n/a
Note.
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2 VersaSync User Manual Rev. 12