Western Telematic AFS-16-1 - Manual (Page 28)

5-7
Basic Configuration
5.3.1. The Real Time Clock and Calendar
The Real Time Clock menu is used to set the AFS-16's internal clock and calendar. The
configuration menu for the Real Time Clock offers the following options:
• Date: The Month, Date, Year and day of the week for the real-time clock/calendar.
• Time: Sets the Hour, Minute and Second for the AFS-16’s real time clock/calendar.
Key in the time using the 24-hour (military) format.
• Time Zone: Sets the time zone, relative to Greenwich Mean Time. Note that the
Time Zone setting will function differently, depending upon whether or not the NTP
feature is enabled and properly configured. (Default = GMT (No DST).)

NTP Enabled: The Time Zone setting is used to adjust the Greenwich Mean
Time value (from the NTP server) in order to determine the precise local time.

NTP Disabled: If NTP is disabled or if the AFS-16 is not able to access the NTP
server, then AFS-16 will list the selected Time Zone and current Real Time Clock
value, but will not apply the correction factor to the displayed Clock value.
• NTP Enable: When enabled, the AFS-16 will contact an NTP server (defined via the
NTP Address prompts) once a day, and update its clock based on the NTP server
time and selected Time Zone. (Default = Off.)
Notes:
• The AFS-16 will also contact the NTP server and update the time whenever
you change NTP parameters.
• To cause AFS-16 to immediately contact the NTP server at any time, make
certain that the NTP feature is enabled and configured, then type /F and
press [Enter]. When the System Parameters menu appears, press [Esc].
The AFS-16 will save parameters and then attempt to contact the server, as
specified by currently defined NTP parameters.
• Primary NTP Address: Defines the IP address or domain name (up to 64
characters long) for the primary NTP server. (Default = undefined.)
Note: In order to use domain names for web addresses, DNS Server
parameters must first be defined as described in Section 5.9.5.
• Secondary NTP Address: Defines the IP address or domain name (up to 64
characters long) for the secondary, fallback NTP Server. (Default = undefined.)
Note: In order to use domain names for web addresses, DNS Server
parameters must be defined as described in Section 5.9.5.
• NTP Timeout: The amount of time in seconds, that will elapse between each
attempt to contact the NTP server. When the initial attempt is unsuccessful, the
AFS-16 will retry the connection four times. If neither the primary nor secondary
NTP server responds, the AFS-16 will wait 24 hours before attempting to contact the
NTP server again. (Default = 3 Seconds.)
• Test NTP Servers: (Text Interface Only) Allows you to send a time request to the
IP address or domain names defined via the Primary and Secondary NTP Address
prompts, or to a new address or domain defined via the Test NTP Servers submenu.
The AFS-16 will not store the response from the IP address or domain, but will verify
whether or not the target address or domain is an NTP Server.