<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title>Ultralink Clock</title> <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> <link <link href="scripts/style.css" type="text/css" rel="stylesheet"> </HEAD> <BODY> <H3> Ultralink Clock</H3> <hr> <h4>Synopsis</h4> Address: 127.127.34.<i>u</i><br> Reference ID: <tt>WWVB</tt><br> Driver ID: <tt>ULINK</tt><br> Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 bps, 8-bits, no parity<br> <br> Features: <tt>(none)</tt> <h4>Description</h4> <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> Leap second and quality are supported.</p> <p>Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome.</p> <hr> <pre> The Model 325 timecode format is: <cr><lf>RQ_1C00LYYYY+DDDUTCS_HH:MM:SSL+5 where: R = Signal readability indicator, ranging from R1 to R5 Q R1 is unreadable, R5 is best reception _ = Space 1 = prev. received data bit, values: 0, 1 ,M or ? unknown C = Signal reception from (C)olorado or (H)awaii 0 = Hours since last WWVB time and flag code update, values 0 00 to 99 (hopefully always 00) L = HEX A5 if receiver is locked to WWVB, Space if not YYYY = Year from 2000 to 2099 + = '+' if current year is a leap year, else ' ' DDD = current day in the year from 1 to 365/366 UTC = timezone (always UTC) S = Daylight savings indicator, (S)TD, (D)ST, (O) transition into DST, (I) transition out of DST _ = Space HH = UTC hour 0 to 23 : = Time delimiter, ':' if synced, Space if not MM = Minutes of current hour from 0 to 59 : = Time delimiter, ':' if synced, Space if not SS = Seconds of current minute from 0 to 59 mm = 10's milliseconds of the current second from 00 to 99 L = Leap second pending at end of month, (I)nsert, (D)elete or Space +5 = UT1 correction, +/- .1 sec increments </pre> <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> <hr> <pre> The Model 320 timecode format is: <cr><lf>SQRYYYYDDD+HH:MM:SS.mmLT<cr> where: S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?' Q = Number of correlating time-frames, from 0 to 5 R = 'R' -- reception in progress, 'N' -- Noisy reception, ' ' -- standby mode YYYY = year from 1990 to 2089 DDD = current day from 1 to 366 + = '+' if current year is a leap year, else ' ' HH = UTC hour 0 to 23 MM = Minutes of current hour from 0 to 59 SS = Seconds of current minute from 0 to 59 mm = 10's milliseconds of the current second from 00 to 99 L = Leap second pending at end of month -- 'I' = inset, 'D'=delete T = DST <-> STD transition indicators </pre> <p>Note that this driver does not do anything with the T flag.</p> <p>The M320 also has a 'U' command which returns UT1 correction information. It is not used in this driver.</p> <hr> <pre> The Model 33x timecode format is: S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5 Where: S = sync indicator S insync N not in sync the sync flag is WWVB decoder sync nothing to do with time being correct 9+ = signal level 0 thru 9+ If over 9 indicated as 9+ D = data bit ( fun to watch but useless ;-) space 00 = hours since last GOOD WWVB frame sync space YYYY = current year + = leap year indicator DDD = day of year UTC = timezone (always UTC) S = daylight savings indicator space HH = hours : = This is the REAL in sync indicator (: = insync) MM = minutes : = : = in sync ? = NOT in sync SS = seconds L = leap second flag +5 = UT1 correction (sign + digit )) </pre> <p>This driver ignores UT1 correction,DST indicator,Leap year and signal level.</p> <hr> <h4>Fudge factors</h4> <p>flag1 polling enable (1=poll 0=no poll)</p> <hr> <address><a href="mailto:frank.migge@oracle.com">mail</a></address> <!-- hhmts start -->Last modified: Mon Mar 8 10:12:08 PST 2004<!-- hhmts end --> <hr> <script type="text/javascript" language="javascript" src="Ultralink Clock_files/footer.txt"></script> </BODY> </head> </html>