embedaddon/ntp/html/drivers/driver34.html - view

File: [ELWIX - Embedded LightWeight unIX -] / embedaddon / ntp / html / drivers / driver34.html
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs - revision graph
Tue May 29 12:08:38 2012 UTC (12 years, 5 months ago) by misho
Branches: ntp, MAIN
CVS tags: v4_2_6p5p0, v4_2_6p5, HEAD

ntp 4.2.6p5

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="content-type" content="text/html;charset=iso-8859-1"> <title>Ultralink Clock</title> <link href="scripts/style.css" type="text/css" rel="stylesheet"> </head> <body> <h3>Ultralink Clock</h3> <hr> <h4>Synopsis</h4> <p>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> Features: <tt>(none)</tt></p> <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.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> <h4>Model 325 timecode format</h4> <p><tt><cr><lf>RQ_1C00LYYYY+DDDUTCS_HH:MM:SSL+5</tt></p> <p>R = Signal readability indicator, ranging from R1 to R5 Q R1 is unreadable, R5 is best reception<br> _ = Space<br> 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)<br> L = HEX A5 if receiver is locked to WWVB, Space if not<br> YYYY = Year from 2000 to 2099<br> + = '+' if current year is a leap year, else ' '<br> DDD = current day in the year from 1 to 365/366<br> UTC = timezone (always UTC)<br> S = Daylight savings indicator, (S)TD, (D)ST, (O) transition into DST, (I) transition out of DST<br> _ = Space<br> HH = UTC hour 0 to 23<br> : = Time delimiter, ':' if synced, Space if not<br> MM = Minutes of current hour from 0 to 59<br> : = Time delimiter, ':' if synced, Space if not<br> SS = Seconds of current minute from 0 to 59<br> mm = 10's milliseconds of the current second from 00 to 99<br> L = Leap second pending at end of month, (I)nsert, (D)elete or Space<br> +5 = UT1 correction, +/- .1 sec increments</p> <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> <h4>Model 320 timecode format</h4> <p><tt><cr><lf>SQRYYYYDDD+HH:MM:SS.mmLT<cr></tt></p> <p>S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?'<br> Q = Number of correlating time-frames, from 0 to 5<br> R = 'R' -- reception in progress,'N' -- Noisy reception, ' ' -- standby mode<br> YYYY = year from 1990 to 2089<br> DDD = current day from 1 to 366 + = '+' if current year is a leap year, else ' '<br> HH = UTC hour 0 to 23<br> MM = Minutes of current hour from 0 to 59<br> SS = Seconds of current minute from 0 to 59<br> mm = 10's milliseconds of the current second from 00 to 99<br> L = Leap second pending at end of month -- 'I' = insert, 'D'=delete<br> T = DST <-> STD transition indicators</p> <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> <h4>Model 33x timecode format</h4> <p><tt>S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5</tt></p> <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> <p>9+ = signal level 0 thru 9+ If over 9 indicated as 9<br> D = data bit (fun to watch but useless ;-) space<br> 00 = hours since last GOOD WWVB frame sync space<br> YYYY = current year + = leap year indicator<br> DDD = day of year<br> UTC = timezone (always UTC)<br> S = daylight savings indicator space<br> HH = hours : = This is the REAL in sync indicator (: = insync)<br> MM = minutes : = : = in sync ? = NOT in sync<br> SS = seconds<br> L = leap second flag<br> +5 = UT1 correction (sign + digit ))</p> <p>This driver ignores UT1 correction, DST indicator,Leap year and signal level.</p> <h4>Fudge factors</h4> <p>flag1 polling enable (1=poll 0=no poll)</p> <hr> <script type="text/javascript" language="javascript" src="scripts/footer.txt"></script> </body> </html>