1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2 3<html> 4 5 <head> 6 <meta http-equiv="content-type" content="text/html;charset=iso-8859-1"> 7 <title>Ultralink Clock</title> 8 <link href="scripts/style.css" type="text/css" rel="stylesheet"> 9 </head> 10 11 <body> 12 <h3>Ultralink Clock</h3> 13 <hr> 14 <h4>Synopsis</h4> 15 <p>Address: 127.127.34.<i>u</i><br> 16 Reference ID: <tt>WWVB</tt><br> 17 Driver ID: <tt>ULINK</tt><br> 18 Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 bps, 8-bits, no parity<br> 19 Features: <tt>(none)</tt></p> 20 <h4>Description</h4> 21 <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.Leap second and quality are supported. Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome.</p> 22 <h4>Model 325 timecode format</h4> 23 <p><tt><cr><lf>RQ_1C00LYYYY+DDDUTCS_HH:MM:SSL+5</tt></p> 24 <p>R = Signal readability indicator, ranging from R1 to R5 Q R1 is unreadable, R5 is best reception<br> 25 _ = Space<br> 26 1 = prev. received data bit, values: 0, 1 ,M or ? unknown 27 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)<br> 28 L = HEX A5 if receiver is locked to WWVB, Space if not<br> 29 YYYY = Year from 2000 to 2099<br> 30 + = '+' if current year is a leap year, else ' '<br> 31 DDD = current day in the year from 1 to 365/366<br> 32 UTC = timezone (always UTC)<br> 33 S = Daylight savings indicator, (S)TD, (D)ST, (O) transition into DST, (I) transition out of DST<br> 34 _ = Space<br> 35 HH = UTC hour 0 to 23<br> 36 : = Time delimiter, ':' if synced, Space if not<br> 37 MM = Minutes of current hour from 0 to 59<br> 38 : = Time delimiter, ':' if synced, Space if not<br> 39 SS = Seconds of current minute from 0 to 59<br> 40 mm = 10's milliseconds of the current second from 00 to 99<br> 41 L = Leap second pending at end of month, (I)nsert, (D)elete or Space<br> 42 +5 = UT1 correction, +/- .1 sec increments</p> 43 <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> 44 <h4>Model 320 timecode format</h4> 45 <p><tt><cr><lf>SQRYYYYDDD+HH:MM:SS.mmLT<cr></tt></p> 46 <p>S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?'<br> 47 Q = Number of correlating time-frames, from 0 to 5<br> 48 R = 'R' -- reception in progress,'N' -- Noisy reception, ' ' -- standby mode<br> 49 YYYY = year from 1990 to 2089<br> 50 DDD = current day from 1 to 366 + = '+' if current year is a leap year, else ' '<br> 51 HH = UTC hour 0 to 23<br> 52 MM = Minutes of current hour from 0 to 59<br> 53 SS = Seconds of current minute from 0 to 59<br> 54 mm = 10's milliseconds of the current second from 00 to 99<br> 55 L = Leap second pending at end of month -- 'I' = insert, 'D'=delete<br> 56 T = DST <-> STD transition indicators</p> 57 <p>Note that this driver does not do anything with the T flag. The M320 also has a 'U' command which returns UT1 correction information. It is not used in this driver.</p> 58 <h4>Model 33x timecode format</h4> 59 <p><tt>S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5</tt></p> 60 <p>S = sync indicator S insync N not in sync the sync flag is WWVB decoder sync nothing to do with time being correct </p> 61 <p>9+ = signal level 0 thru 9+ If over 9 indicated as 9<br> 62 D = data bit (fun to watch but useless ;-) space<br> 63 00 = hours since last GOOD WWVB frame sync space<br> 64 YYYY = current year + = leap year indicator<br> 65 DDD = day of year<br> 66 UTC = timezone (always UTC)<br> 67 S = daylight savings indicator space<br> 68 HH = hours : = This is the REAL in sync indicator (: = insync)<br> 69 MM = minutes : = : = in sync ? = NOT in sync<br> 70 SS = seconds<br> 71 L = leap second flag<br> 72 +5 = UT1 correction (sign + digit ))</p> 73 <p>This driver ignores UT1 correction, DST indicator,Leap year and signal level.</p> 74 <h4>Fudge factors</h4> 75 <p>flag1 polling enable (1=poll 0=no poll)</p> 76 <hr> 77 <script type="text/javascript" language="javascript" src="scripts/footer.txt"></script> 78 </body> 79</html> 80