/contrib/ntp/html/drivers/driver34.html
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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> 2 3<html> 4 5 <head> 6 <title>Ultralink Clock</title> 7 <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> 8 <link <link href="scripts/style.css" type="text/css" rel="stylesheet"> </HEAD> <BODY> <H3> Ultralink Clock</H3> 9 <hr> 10 <h4>Synopsis</h4> 11 Address: 127.127.34.<i>u</i><br> 12 Reference ID: <tt>WWVB</tt><br> 13 Driver ID: <tt>ULINK</tt><br> 14 Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 bps, 8-bits, no parity<br> 15 <br> 16 Features: <tt>(none)</tt> 17 <h4>Description</h4> 18 <p>This driver supports the Ultralink Model 325 (replacement for Model 320) RS-232 powered WWVB receiver. PDF specs available on <a href="http://www.ulio.com/">http://www.ulio.com/</a>. This driver also supports the Model 320, 330,331,332 decoders in both polled or continous time code mode.<br> 19 Leap second and quality are supported.</p> 20 <p>Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome.</p> 21 <hr> 22 <pre> The Model 325 timecode format is: 23 24 <cr><lf>RQ_1C00LYYYY+DDDUTCS_HH:MM:SSL+5 25 26 where: 27 28 R = Signal readability indicator, ranging from R1 to R5 29 Q R1 is unreadable, R5 is best reception 30 _ = Space 31 1 = prev. received data bit, values: 0, 1 ,M or ? unknown 32 C = Signal reception from (C)olorado or (H)awaii 33 0 = Hours since last WWVB time and flag code update, values 34 0 00 to 99 (hopefully always 00) 35 L = HEX A5 if receiver is locked to WWVB, Space if not 36 YYYY = Year from 2000 to 2099 37 + = '+' if current year is a leap year, else ' ' 38 DDD = current day in the year from 1 to 365/366 39 UTC = timezone (always UTC) 40 S = Daylight savings indicator, (S)TD, (D)ST, (O) transition 41 into DST, (I) transition out of DST 42 _ = Space 43 HH = UTC hour 0 to 23 44 : = Time delimiter, ':' if synced, Space if not 45 MM = Minutes of current hour from 0 to 59 46 : = Time delimiter, ':' if synced, Space if not 47 SS = Seconds of current minute from 0 to 59 48 mm = 10's milliseconds of the current second from 00 to 99 49 L = Leap second pending at end of month, (I)nsert, (D)elete 50 or Space 51 +5 = UT1 correction, +/- .1 sec increments 52 </pre> 53 <p>Note that Model 325 reports a very similar output like Model 33X series. The driver for this clock is similar to Model 33X behavior. On a unmodified new ULM325 clock, the polling flag (flag1 =1) needs to be set.</p> 54 <hr> 55 <pre> The Model 320 timecode format is: 56 57 <cr><lf>SQRYYYYDDD+HH:MM:SS.mmLT<cr> 58 59 where: 60 61 S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?' 62 Q = Number of correlating time-frames, from 0 to 5 63 R = 'R' -- reception in progress, 'N' -- Noisy reception, ' ' -- standby mode 64 YYYY = year from 1990 to 2089 65 DDD = current day from 1 to 366 66 + = '+' if current year is a leap year, else ' ' 67 HH = UTC hour 0 to 23 68 MM = Minutes of current hour from 0 to 59 69 SS = Seconds of current minute from 0 to 59 70 mm = 10's milliseconds of the current second from 00 to 99 71 L = Leap second pending at end of month -- 'I' = inset, 'D'=delete 72 T = DST <-> STD transition indicators 73 </pre> 74 <p>Note that this driver does not do anything with the T flag.</p> 75 <p>The M320 also has a 'U' command which returns UT1 correction information. It is not used in this driver.</p> 76 <hr> 77 <pre> The Model 33x timecode format is: 78 79 S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5 80 81 Where: 82 83 S = sync indicator S insync N not in sync 84 the sync flag is WWVB decoder sync 85 nothing to do with time being correct 86 9+ = signal level 0 thru 9+ If over 9 indicated as 9+ 87 D = data bit ( fun to watch but useless ;-) 88 space 89 00 = hours since last GOOD WWVB frame sync 90 space 91 YYYY = current year 92 + = leap year indicator 93 DDD = day of year 94 UTC = timezone (always UTC) 95 S = daylight savings indicator 96 space 97 HH = hours 98 : = This is the REAL in sync indicator (: = insync) 99 MM = minutes 100 : = : = in sync ? = NOT in sync 101 SS = seconds 102 L = leap second flag 103 +5 = UT1 correction (sign + digit )) 104 </pre> 105 <p>This driver ignores UT1 correction,DST indicator,Leap year and signal level.</p> 106 <hr> 107 <h4>Fudge factors</h4> 108 <p>flag1 polling enable (1=poll 0=no poll)</p> 109 <hr> 110 <address><a href="mailto:frank.migge@oracle.com">mail</a></address> 111 <!-- hhmts start -->Last modified: Mon Mar 8 10:12:08 PST 2004<!-- hhmts end --> 112 <hr> 113 <script type="text/javascript" language="javascript" src="Ultralink Clock_files/footer.txt"></script> 114 </BODY> 115 </head> 116 117</html>