| 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"> |
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| 2 | <html> |
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| 3 | <head> |
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| 4 | <title>Forum Graphic GPS Dating station</title> |
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| 5 | </head> |
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| 6 | <body> |
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| 7 | |
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| 8 | <h3>Forum Graphic GPS Dating station</h3> |
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| 9 | <hr> |
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| 10 | |
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| 11 | <h4>Synopsis</h4> |
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| 12 | |
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| 13 | <p>Address: 127.127.37.<i>u</i><br> |
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| 14 | Reference ID: <tt>GPS</tt><br> |
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| 15 | Driver ID: <tt>GPS</tt><br> |
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| 16 | Parallel Port: <tt>/dev/fgclock<i>u</i></tt> |
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| 17 | </p> |
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| 18 | |
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| 19 | <h4>Description</h4> |
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| 20 | |
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| 21 | <p>This driver supports the Forum Graphic GPS Dating station sold by <a |
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| 22 | href="http://www.emr.fr/gpsclock.htm">EMR company</a>. |
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| 23 | |
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| 24 | <p>Unfortunately sometime FG GPS start continues reporting of the same |
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| 25 | date. The only way to fix this problem is GPS power cycling and ntpd |
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| 26 | restart after GPS power-up. |
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| 27 | </P> |
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| 28 | After Jan,10 2000 my FG GPS unit start send a wrong answer after 10:00am |
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| 29 | till 11:00am. It repeat hour value in result string twice. I wroite a small |
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| 30 | code to avoid such problem. Unfortunately I have no second FG GPS unit |
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| 31 | to evaluate this problem. Please let me know if your GPS has no problems |
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| 32 | after Y2K. |
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| 33 | <p> |
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| 34 | |
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| 35 | <h4>Monitor Data</h4> |
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| 36 | |
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| 37 | <p>Each timecode is written to the <tt>clockstats</tt> file in the format |
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| 38 | <tt>YYYY YD HH MI SS</tt>.</p> |
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| 39 | |
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| 40 | <h4>Fudge Factors</h4> |
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| 41 | |
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| 42 | <dl> |
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| 43 | <dt><tt>time1 <i>time</i></tt></dt> |
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| 44 | <dd>Specifies the time offset calibration factor, in seconds and fraction, |
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| 45 | with default 0.0.</dd> |
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| 46 | |
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| 47 | <dt><tt>time2 <i>time</i></tt></dt> |
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| 48 | <dd>Not used by this driver.</dd> |
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| 49 | |
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| 50 | <dt><tt>stratum <i>number</i></tt></dt> |
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| 51 | <dd>Specifies the driver stratum, in decimal from 0 to 15, with default 0. |
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| 52 | </dd> |
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| 53 | |
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| 54 | <dt><tt>refid <i>string</i></tt></dt> |
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| 55 | <dd>Specifies the driver reference identifier, an ASCII string from one to |
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| 56 | four characters, with default <tt>FG</tt>.</dd> |
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| 57 | |
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| 58 | <dt><tt>flag1 0 | 1</tt></dt> |
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| 59 | <dd>Not used by this driver.</dd> |
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| 60 | |
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| 61 | <dt><tt>flag2 0 | 1</tt></dt> |
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| 62 | <dd>Not used by this driver.</dd> |
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| 63 | |
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| 64 | <dt><tt>flag3 0 | 1</tt></dt> |
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| 65 | <dd>Not used by this driver.</dd> |
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| 66 | |
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| 67 | <dt><tt>flag4 0 | 1</tt></dt> |
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| 68 | <dd>Not used by this driver.</dd> |
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| 69 | </dl> |
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| 70 | |
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| 71 | <hr> |
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| 72 | <address>Dmitry Smirnov (das@amt.ru)</address> |
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| 73 | |
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| 74 | </body> |
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| 75 | </html> |
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