265 lines
10 KiB
Plaintext
265 lines
10 KiB
Plaintext
The parse driver currently supports several clocks with different
|
|
query mechanisms. In order for you to find a sample that might be
|
|
similar to a clock you might want to integrate into parse i'll sum
|
|
up the major features of the clocks (this information is distributed
|
|
in the parse/clk_*.c and xntpd/refclock_parse.c files).
|
|
|
|
---
|
|
Meinberg: 127.127.8. 0- 3 (PZF535TCXO)
|
|
127.127.8. 4- 7 (PZF535OCXO)
|
|
127.127.8. 8-11 (DCFUA31)
|
|
127.127.8.28-31 (GPS166)
|
|
Meinberg: start=<STX>, end=<ETX>, sync on start
|
|
pattern="\2D: . . ;T: ;U: . . ; \3"
|
|
pattern="\2 . . ; ; : : ; \3"
|
|
pattern="\2 . . ; ; : : ; : ; ; . . "
|
|
|
|
Meinberg is a german manufacturer of time code receivers. Those clocks
|
|
have a pretty common output format in the stock version. In order to
|
|
support NTP Meinberg was so kind to produce some special versions of
|
|
the firmware for the use with NTP. So, if you are going to use a
|
|
Meinberg clock please ask whether there is a special Uni Erlangen
|
|
version.
|
|
|
|
General characteristics:
|
|
Meinberg clocks primarily output pulse per second and a describing
|
|
ASCII string. This string can be produced in two modes. either upon
|
|
the reception of a question mark or every second. NTP uses the latter
|
|
mechanism. The DCF77 variants have a pretty good relationship between
|
|
RS232 time code and the PPS signal while the GPS receiver has no fixed
|
|
timeing between the datagram and the pulse (you need to use PPS with
|
|
GPS!) on DCF77 you might get away without the PPS signal.
|
|
|
|
The preferred tty setting for Meinberg is:
|
|
CFLAG (B9600|CS7|PARENB|CREAD|HUPCL)
|
|
IFLAG (IGNBRK|IGNPAR|ISTRIP)
|
|
OFLAG 0
|
|
LFLAG 0
|
|
|
|
The clock is run at datagram once per second.
|
|
Stock dataformat is:
|
|
|
|
<STX>D:<dd>.<mm>.<yy>;T:<w>;U:<hh>:<mm>:<ss>;<S><F><D><A><ETX>
|
|
pos: 0 00 00 0 00 0 11 111 1 111 12 2 22 2 22 2 2 2 3 3 3
|
|
1 23 45 6 78 9 01 234 5 678 90 1 23 4 56 7 8 9 0 1 2
|
|
|
|
<STX> = '\002' ASCII start of text
|
|
<ETX> = '\003' ASCII end of text
|
|
<dd>,<mm>,<yy> = day, month, year(2 digits!!)
|
|
<w> = day of week (sunday= 0)
|
|
<hh>,<mm>,<ss> = hour, minute, second
|
|
<S> = '#' if never synced since powerup else ' ' for DCF U/A 31
|
|
'#' if not PZF sychronisation available else ' ' for PZF 535
|
|
<F> = '*' if time comes from internal quartz else ' '
|
|
<D> = 'S' if daylight saving time is active else ' '
|
|
<A> = '!' during the hour preceeding an daylight saving time
|
|
start/end change
|
|
|
|
For the university of Erlangen a special format was implemented to support
|
|
LEAP announcement and anouncement of alternate antenna.
|
|
|
|
Version for UNI-ERLANGEN Software is: PZFUERL V4.6 (Meinberg)
|
|
|
|
The use of this software release (or higher) is *ABSOLUTELY*
|
|
recommended (ask for PZFUERL version as some minor HW fixes have
|
|
been introduced) due to the LEAP second support and UTC indication.
|
|
The standard timecode does not indicate when the timecode is in
|
|
UTC (by front panel configuration) thus we have no chance to find
|
|
the correct utc offset. For the standard format do not ever use
|
|
UTC display as this is not detectable in the time code !!!
|
|
|
|
<STX><dd>.<mm>.<yy>; <w>; <hh>:<mm>:<ss>; <U><S><F><D><A><L><R><ETX>
|
|
pos: 0 00 0 00 0 00 11 1 11 11 1 11 2 22 22 2 2 2 2 2 3 3 3
|
|
1 23 4 56 7 89 01 2 34 56 7 89 0 12 34 5 6 7 8 9 0 1 2
|
|
<STX> = '\002' ASCII start of text
|
|
<ETX> = '\003' ASCII end of text
|
|
<dd>,<mm>,<yy> = day, month, year(2 digits!!)
|
|
<w> = day of week (sunday= 0)
|
|
<hh>,<mm>,<ss> = hour, minute, second
|
|
<U> = 'U' UTC time display
|
|
<S> = '#' if never synced since powerup else ' ' for DCF U/A 31
|
|
'#' if not PZF sychronisation available else ' ' for PZF 535
|
|
<F> = '*' if time comes from internal quartz else ' '
|
|
<D> = 'S' if daylight saving time is active else ' '
|
|
<A> = '!' during the hour preceeding an daylight saving time
|
|
start/end change
|
|
<L> = 'A' LEAP second announcement
|
|
<R> = 'R' alternate antenna
|
|
|
|
Meinberg GPS166 receiver
|
|
|
|
You must get the Uni-Erlangen firmware for the GPS receiver support
|
|
to work to full satisfaction !
|
|
|
|
<STX><dd>.<mm>.<yy>; <w>; <hh>:<mm>:<ss>; <+/-><00:00>; <U><S><F><D><A><L><R><L>; <position...><ETX>
|
|
*
|
|
000000000111111111122222222223333333333444444444455555555556666666
|
|
123456789012345678901234567890123456789012345678901234567890123456
|
|
\x0209.07.93; 5; 08:48:26; +00:00; ; 49.5736N 11.0280E 373m\x03
|
|
*
|
|
|
|
<STX> = '\002' ASCII start of text
|
|
<ETX> = '\003' ASCII end of text
|
|
<dd>,<mm>,<yy> = day, month, year(2 digits!!)
|
|
<w> = day of week (sunday= 0)
|
|
<hh>,<mm>,<ss> = hour, minute, second
|
|
<+/->,<00:00> = offset to UTC
|
|
<S> = '#' if never synced since powerup else ' ' for DCF U/A 31
|
|
'#' if not PZF sychronisation available else ' ' for PZF 535
|
|
<U> = 'U' UTC time display
|
|
<F> = '*' if time comes from internal quartz else ' '
|
|
<D> = 'S' if daylight saving time is active else ' '
|
|
<A> = '!' during the hour preceeding an daylight saving time
|
|
start/end change
|
|
<L> = 'A' LEAP second announcement
|
|
<R> = 'R' alternate antenna (reminiscent of PZF535) usually ' '
|
|
<L> = 'L' on 23:59:60
|
|
|
|
|
|
For the Meinberg parse look into clock_meinberg.c
|
|
|
|
---
|
|
RAWDCF: 127.127.8.20-23 (Conrad receiver module - delay 258ms)
|
|
127.127.8.24-27 (FAU receiver - delay 210ms)
|
|
127.127.8.40-43 (Boeder receiver - delay 258ms)
|
|
RAWDCF: end=TIMEOUT>1.5s, sync each char (any char), generate psuedo time
|
|
codes, fixed format
|
|
|
|
direct DCF77 code input
|
|
In Europe it is relatively easy/cheap the receive the german time code
|
|
transmitter DCF77. The simplest version to process its signal is to
|
|
feed the 100/200ms pulse of the demodulated AM signal via a level
|
|
converter to an RS232 port at 50Baud. parse/clk_rawdcf.c holds all
|
|
necessary decoding logic for the time code which is transmitted each
|
|
minute for one minute. A bit of the time code is sent once a second.
|
|
|
|
The preferred tty setting is:
|
|
CFLAG (B50|CS8|CREAD|CLOCAL)
|
|
IFLAG 0
|
|
OFLAG 0
|
|
LFLAG 0
|
|
|
|
DCF77 raw time code
|
|
|
|
From "Zur Zeit", Physikalisch-Technische Bundesanstalt (PTB), Braunschweig
|
|
und Berlin, Maerz 1989
|
|
|
|
Timecode transmission:
|
|
AM:
|
|
time marks are send every second except for the second before the
|
|
next minute mark
|
|
time marks consist of a reduction of transmitter power to 25%
|
|
of the nominal level
|
|
the falling edge is the time indication (on time)
|
|
time marks of a 100ms duration constitute a logical 0
|
|
time marks of a 200ms duration constitute a logical 1
|
|
FM:
|
|
see the spec. (basically a (non-)inverted psuedo random phase shift)
|
|
|
|
Encoding:
|
|
Second Contents
|
|
0 - 10 AM: free, FM: 0
|
|
11 - 14 free
|
|
15 R - alternate antenna
|
|
16 A1 - expect zone change (1 hour before)
|
|
17 - 18 Z1,Z2 - time zone
|
|
0 0 illegal
|
|
0 1 MEZ (MET)
|
|
1 0 MESZ (MED, MET DST)
|
|
1 1 illegal
|
|
19 A2 - expect leap insertion/deletion (1 hour before)
|
|
20 S - start of time code (1)
|
|
21 - 24 M1 - BCD (lsb first) Minutes
|
|
25 - 27 M10 - BCD (lsb first) 10 Minutes
|
|
28 P1 - Minute Parity (even)
|
|
29 - 32 H1 - BCD (lsb first) Hours
|
|
33 - 34 H10 - BCD (lsb first) 10 Hours
|
|
35 P2 - Hour Parity (even)
|
|
36 - 39 D1 - BCD (lsb first) Days
|
|
40 - 41 D10 - BCD (lsb first) 10 Days
|
|
42 - 44 DW - BCD (lsb first) day of week (1: Monday -> 7: Sunday)
|
|
45 - 49 MO - BCD (lsb first) Month
|
|
50 MO0 - 10 Months
|
|
51 - 53 Y1 - BCD (lsb first) Years
|
|
54 - 57 Y10 - BCD (lsb first) 10 Years
|
|
58 P3 - Date Parity (even)
|
|
59 - usually missing (minute indication), except for leap insertion
|
|
|
|
---
|
|
Schmid clock: 127.127.8.16-19
|
|
Schmid clock: needs poll, binary input, end='\xFC', sync start
|
|
|
|
The Schmid clock is a DCF77 receiver that sends a binary
|
|
time code at the reception of a flag byte. The contents
|
|
if the flag byte determined the time code format. The
|
|
binary time code is delimited by the byte 0xFC.
|
|
|
|
TTY setup is:
|
|
CFLAG (B1200|CS8|CREAD|CLOCAL)
|
|
IFLAG 0
|
|
OFLAG 0
|
|
LFLAG 0
|
|
|
|
The command to Schmid's DCF77 clock is a single byte; each bit
|
|
allows the user to select some part of the time string, as follows (the
|
|
output for the lsb is sent first).
|
|
|
|
Bit 0: time in MEZ, 4 bytes *binary, not BCD*; hh.mm.ss.tenths
|
|
Bit 1: date 3 bytes *binary, not BCD: dd.mm.yy
|
|
Bit 2: week day, 1 byte (unused here)
|
|
Bit 3: time zone, 1 byte, 0=MET, 1=MEST. (unused here)
|
|
Bit 4: clock status, 1 byte, 0=time invalid,
|
|
1=time from crystal backup,
|
|
3=time from DCF77
|
|
Bit 5: transmitter status, 1 byte,
|
|
bit 0: backup antenna
|
|
bit 1: time zone change within 1h
|
|
bit 3,2: TZ 01=MEST, 10=MET
|
|
bit 4: leap second will be
|
|
added within one hour
|
|
bits 5-7: Zero
|
|
Bit 6: time in backup mode, units of 5 minutes (unused here)
|
|
|
|
|
|
---
|
|
Trimble SV6: 127.127.8.32-35
|
|
Trimble SV6: needs poll, ascii timecode, start='>', end='<',
|
|
query='>QTM<', eol='<'
|
|
|
|
Trimble SV6 is a GPS receiver with PPS output. It needs to be polled.
|
|
It also need a special tty mode setup (EOL='<').
|
|
|
|
TTY setup is:
|
|
CFLAG (B4800|CS8|CREAD)
|
|
IFLAG (BRKINT|IGNPAR|ISTRIP|ICRNL|IXON)
|
|
OFLAG (OPOST|ONLCR)
|
|
LFLAG (ICANON|ECHOK)
|
|
|
|
Special flags are:
|
|
PARSE_F_PPSPPS - use CIOGETEV for PPS time stamping
|
|
PARSE_F_PPSONSECOND - the time code is not related to
|
|
the PPS pulse (so use the time code
|
|
only for the second epoch)
|
|
|
|
Timecode
|
|
0000000000111111111122222222223333333 / char
|
|
0123456789012345678901234567890123456 \ posn
|
|
>RTMhhmmssdddDDMMYYYYoodnnvrrrrr;*xx< Actual
|
|
----33445566600112222BB7__-_____--99- Parse
|
|
>RTM 1 ;* <", Check
|
|
|
|
---
|
|
ELV DCF7000: 127.127.8.12-15
|
|
ELV DCF7000: end='\r', pattern=" - - - - - - - \r"
|
|
|
|
The ELV DCF7000 is a cheap DCF77 receiver sending each second
|
|
a time code (though not very precise!) delimited by '`r'
|
|
|
|
Timecode
|
|
YY-MM-DD-HH-MM-SS-FF\r
|
|
|
|
FF&0x1 - DST
|
|
FF&0x2 - DST switch warning
|
|
FF&0x4 - unsynchronised
|
|
|