Datum TYMSERVE 2000 - 3.4 NTP Data Format

The following time information string is transmitted once per second (when started with the 'c' or
'C' character). The 'DDD' field represents 3 ASCII digits of days (001 - 366), etc. The Quality
Indicator indicates the validity of the time. The Carriage Return character is transmitted on-time.
The first rising edge of the Carriage Return character occurs within 200 μsec after the
TYMSERVE 1 PPS signal transitions from low to high.
(SOH)DDD:HH:MM:SSQ(CR)(F)
FIELD DESCRIPTION
(SOH) (0x01) ASCII Start of Header
DDD Day of year
HH Hours (24-hour clock)
MM Minutes
SS Seconds
Q Quality Indicator (space = normal operation)
(CR) (0x0D) ASCII Carriage Return (transmitted on-time)
(LF) (0x0A) ASCII Line Feed
QUALITY CHAR DESCRIPTION
space Normal operation, time set and not flywheeling
X Time not set yet
F Time was set, but currently flywheeling
3.4 NTP DATA FORMAT
The format of the NTP message data area, which immediately follows the UDP header, is shown
in Figure 3-1. The NTP message fields are described below. The TYMSERVE 2000 does not
implement the optional Authenticator field.
NTP timestamps are represented as a 64-bit unsigned fixed-point number, in seconds relative to
0
h
on 1 January 1900. The integer part is in the first 32 bits and the fraction part in the last 32
bits.
TYMSERVE 2000 Manual Datum Inc, Bancomm Div.
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