1 | <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"> |
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2 | <html> <head> |
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3 | <meta http-equiv="Content-Type" content="text/html; charset=iso8859-1"> |
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4 | <title>Ultralink Clock</title> |
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5 | </head> |
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6 | |
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7 | <body> |
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8 | <h3>Ultralink Clock</h3> |
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9 | |
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10 | <hr> |
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11 | <h4>Synopsis</h4> |
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12 | Address: 127.127.34.<i>u</i><br> |
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13 | Reference ID: <TT>WWVB</TT><br> |
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14 | Driver ID: <tt>ULINK</tt><br> |
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15 | Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 bps, 8-bits, |
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16 | no parity<br> |
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17 | <br>Features: <tt>(none)</tt> |
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18 | <h4>Description</h4> |
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19 | This driver supports the Ultralink Model 320 RS-232 powered WWVB receiver. PDF specs available on <a href="http://www.ulio.com">www.ulio.com</a>. |
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20 | This driver also supports the Model 330,331,332 decoders in both polled or continous time code mode. Leap second and quality are supported. |
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21 | |
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22 | <P>Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome. |
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23 | <hr> |
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24 | <pre> |
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25 | The Model 320 timecode format is: |
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26 | |
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27 | <cr><lf>SQRYYYYDDD+HH:MM:SS.mmLT<cr> |
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28 | |
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29 | where: |
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30 | |
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31 | S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?' |
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32 | Q = Number of correlating time-frames, from 0 to 5 |
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33 | R = 'R' -- reception in progress, 'N' -- Noisy reception, ' ' -- standby mode |
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34 | YYYY = year from 1990 to 2089 |
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35 | DDD = current day from 1 to 366 |
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36 | + = '+' if current year is a leap year, else ' ' |
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37 | HH = UTC hour 0 to 23 |
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38 | MM = Minutes of current hour from 0 to 59 |
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39 | SS = Seconds of current minute from 0 to 59 |
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40 | mm = 10's milliseconds of the current second from 00 to 99 |
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41 | L = Leap second pending at end of month -- 'I' = inset, 'D'=delete |
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42 | T = DST <-> STD transition indicators |
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43 | |
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44 | Note that this driver does not do anything with the T flag. |
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45 | |
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46 | The M320 also has a 'U' command which returns UT1 correction information. |
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47 | It is not used in this driver. |
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48 | </pre> |
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49 | <hr> |
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50 | <pre> |
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51 | The Model 33x timecode format is: |
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52 | |
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53 | S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5 |
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54 | |
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55 | Where: |
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56 | |
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57 | S = sync indicator S insync N not in sync |
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58 | the sync flag is WWVB decoder sync |
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59 | nothing to do with time being correct |
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60 | 9+ = signal level 0 thru 9+ If over 9 indicated as 9+ |
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61 | D = data bit ( fun to watch but useless ;-) |
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62 | space |
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63 | 00 = hours since last GOOD WWVB frame sync |
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64 | space |
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65 | YYYY = current year |
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66 | + = leap year indicator |
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67 | DDD = day of year |
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68 | UTC = timezone (always UTC) |
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69 | S = daylight savings indicator |
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70 | space |
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71 | HH = hours |
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72 | : = This is the REAL in sync indicator (: = insync) |
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73 | MM = minutes |
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74 | : = : = in sync ? = NOT in sync |
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75 | SS = seconds |
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76 | L = leap second flag |
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77 | +5 = UT1 correction (sign + digit )) |
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78 | |
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79 | This driver ignores UT1 correction,DST indicator,Leap year |
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80 | and signal level. |
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81 | |
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82 | </pre> |
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83 | <hr> |
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84 | <pre> |
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85 | |
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86 | Fudge factors |
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87 | flag1 polling enable (1=poll 0=no poll) |
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88 | |
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89 | |
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90 | </pre> |
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91 | <hr> |
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92 | <address><a href="mailto:dstrout@linuxfoundary.com">mail</a></address> |
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93 | <!-- hhmts start --> |
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94 | Last modified: Tue Sep 14 05:53:08 EDT 1999 |
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95 | <!-- hhmts end --> |
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96 | </body> </html> |
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