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8.2
Time server via network
The following protocols are available for time synchronization via network:
8.2.1
TIME Protocol
Using this protocol, the time is sent as an unsigned 32-bit integer to the connected de-
vice, representing the number of seconds since January 1, 1900, 00:00 GMT.
The protocol requires port 37 (TCP/UDP). This port has to be released in the firewall, if
a firewall is used.
8.2.2
DAYTIME Protocol
When a host is connected to the server, the host will receive the current date and time
as ASCII character string. The used format may vary from system to system.
Possible format:
Weekday, month, day, year time zone
Example:
Tuesday, December 14, 1982 13:37:42-GMT
The protocol requires port 13 (TCP/UDP), which has to be released in the firewall.
8.2.3
NTP
Many controls and PCs can be synchronized with NTP (Network Time Protocol). When
using the NTP client integrated in Windows (from Windows 2000), a precision of 1 – 2 s
can be reached. If a higher precision is required, then third party programs have to be
used.
The protocol uses port 123 UDP. This port has to be released in the firewall to ensure a
proper function.
Setup under Windows 7 (as example):
1. Click with the left mouse button on the time display in the taskbar.
Manual
Issue 1.4
17
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