Asentria SiteBoss 571 UserManual
Page 104
SiteBoss 571 - System Date/Time
A) Current Date [12/16/2010]
B) Current Time [14:46:21]
C) Adjust for Daylight Savings [ON]
D) GMT Difference (hours) [8]
E) GMT Difference Direction [BEHIND]
F) Enable Time Protocol [OFF]
G) Time Servers []
Current Date
The date can be manually set using this field. The unit automatically calculates the day of the week to display on
the Status screen.
Current Time
The time of day can be manually set (24 hour clock).
Note:
The date and time settings are maintained by means of an internal battery backup when power is
removed from the SiteBoss.
Adjust for Daylight Savings
This is an ON/OFF toggle that allows automatic daylight savings time updating.
Note:
On the second Sunday in March, clocks are set ahead one hour at 2:00 a.m. local standard time,
which becomes 3:00 a.m. local daylight time. On the first Sunday in November, clocks are set back one
hour at 2:00 a.m. local daylight time, which becomes 1:00 a.m. local standard time.
GMT Difference (hours)
Set the number of hours the current time zone is offset from GMT. Valid input ranges from 0 to 12. The default
setting is 8 hours.
GMT Difference Direction
Set whether you are east (ahead) or west (behind) of GMT. For example, Pacific Time (GMT-8) is behind and
Tokyo time (GMT +9) is ahead. The default setting is BEHIND.
Enable Time Protocol
This option toggles between OFF, SIMPLE, and NTP. The default setting is OFF.
SIMPLE - When network time is set to SIMPLE the unit attempts to contact the configured time servers
(see Time Servers setting below) periodically, attempting to query each using Simple Network Time
Protocol (SNTP), Time, and Daytime protocols, in that order. Once a response is received for any protocol,
the unit sets the system clock to the new time, updates the real time hardware clock (RTC), then the
network time process dies. The interval for checking network time is hard-coded to 12 hours plus or minus
a random several hours.
NTP
-
When network time is set to Network Time Protocol (NTP), the NTP daemon is kept running at all
times. Unlike the SIMPLE setting, with NTP the clock is not immediately set as soon as a time server is
contacted. Rather, the NTP daemon utilizes various algorithms to set the time in an accurate and robust
manner. Since the NTP daemon updates the system time asynchronously, the current time is stored in
the RTC every 30 minutes while it is running. Note that if you change the clock manually, it may be a
period of an hour or more before NTP resets it.
Time Servers
This option displays a menu where the hostname or IP address of six time-servers can be configured (maximum
length 64 chars). The SiteBoss uses the following servers by default:
time.nist.gov
216.171.120.36
64.90.182.55
