notation in the form
A.B.C.D/n
where
/n
is the network prefix (the number
of significant bits used to identify a network). Only /8, /16, /24 or /32 are
recognized as network prefix.
For example,
RESTRICT = 192.168.0.0/24
restricts accesss to hosts in the
range 192.168.0.0 to 192.168.0.255.
Stratum to be reported by the NTP service during HOLDOVER. Values between
STRATUM_HOLDOVER
0 and 4 are accepted, default is 0.
Stratum to be reported by the NTP service during LOWQUALITY. Values between
STRATUM_LOWQUALITY
0 and 9 are accepted, default is 0.
Stratum to be reported by the NTP service during BADTIME. Values between 0
STRATUM_BADTIME
and 14 are accepted, default is 0.
5.6 Serial Time Strings
Parameters in this section allow the configuration of the time reported at the
serial port. The configured time string is sent once per second shortly (a few
milliseconds) after the UTC second rollover.
Serial port parameters are defined in section [SERIAL].
[SERIAL]
Selects contents of time string sent over the serial port.
TIMESTRING
Possible values are NONE (serial port is disabled), GPZDA, MEINBERG, SAT, SELB1,
SELB5, SELB6, SELB8 or TRUETIME. Default is NONE.
See appendix
on page
for a detailed description of each TIMESTRING.
The speed at which the time string will be transmitted.
BITRATE
Valid values are 1200, 2400, 4800, 9600, 19200 or 38400 bits per second (bps).
Default is 9600.
The number of data bits, parity and stop bits to use for the messages trans-
FORMAT
mitted.
Specified using a three-character shortcut in the form
dps
, where
d
number of data bits
7 or 8
p
parity
N (none), E (even), O (odd)
s
number of stop bits
1 or 2
Default is 8N1.
Selects if the time reported in the time string is local time (LOCAL) or UTC time
TIMEBASE
(UTC), default is LOCAL.
If LOCAL is selected, it will be subject to the daylight saving time rules. UTC
time ignores daylight saving time rules.
This parameter selects which PPS pulse refers to the time reported in the time
PPS
string.
Possible values are CURRENT or NEXT, default is CURRENT.
If CURRENT is selected, the time string will contain the time stamp of the “cur-
rent” PPS pulse, see figure
. This is probably the right configuration if the
time string is not being latched by the PPS signal on the receiving device.
If NEXT is selected, the time string will contain the time stamp of the next PPS
pulse (figure
). This configuration allows the use of the PPS signal to latch
the reported time in the receiving device.
Settings
23
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