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| author | roberto <roberto@FreeBSD.org> | 2004-07-20 15:19:51 +0000 |
|---|---|---|
| committer | roberto <roberto@FreeBSD.org> | 2004-07-20 15:19:51 +0000 |
| commit | 52f0477edd81105d995864898a64a601b67d66d8 (patch) | |
| tree | 3528c92623def79de13bd8f8caaa5639362dd64b /contrib/ntp/html/driver20.htm | |
| parent | 4155ac9f07c2f1986843c07b428ac66e6f11ffe0 (diff) | |
| download | FreeBSD-src-52f0477edd81105d995864898a64a601b67d66d8.zip FreeBSD-src-52f0477edd81105d995864898a64a601b67d66d8.tar.gz | |
Merge conflicts.
Lots of added files, some removed and quite a large number of renames :(
Diffstat (limited to 'contrib/ntp/html/driver20.htm')
| -rw-r--r-- | contrib/ntp/html/driver20.htm | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/contrib/ntp/html/driver20.htm b/contrib/ntp/html/driver20.htm deleted file mode 100644 index 6d1126b..0000000 --- a/contrib/ntp/html/driver20.htm +++ /dev/null @@ -1,161 +0,0 @@ -<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> -<html> -<head> - <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> - <meta name="GENERATOR" content="Mozilla/4.76 [en] (X11; U; Linux 2.2.16-22 i586) [Netscape]"> - <title>Generic NMEA GPS Receiver -</title> -</head> -<body> - -<h3> -Generic NMEA GPS Receiver</h3> - -<hr> -<h4> -Synopsis</h4> -Address: 127.127.20.<i>u</i> -<br>Reference ID: <tt>GPS</tt> -<br>Driver ID: <tt>GPS_NMEA</tt> -<br>Serial Port: <tt>/dev/gps<i>u</i></tt>; 4800 baud, 8-bits, no parity -<br>Features: <tt>tty_clk</tt> -<h4> -Description</h4> -This driver supports GPS receivers with the <tt>$GPRMC</tt> NMEA output -string by default. Alternately the <tt>$GPGGA</tt> or <tt>$GPGLL -</tt>may -be selected. -<br>The driver expects the receiver to be set up to transmit a <tt>$GPRMC</tt> -message every second. -<p>The accuracy depend on the receiver used. Inexpesive GPS models are -available with a claimed PPS signal accuracy of 1 <font face="Symbol">m</font>s -or better relative to the broadcast signal. However, in most cases the -actual accuracy is limited by the precision of the timecode and the latencies -of the serial interface and operating system. -<p>If the Operating System supports the PPSAPI, RFC-2783, it will be used. -<br> -<p>The various GPS sentences that this driver recognises look like this: -<br>(others quietly ignored) -<pre><tt>$GPRMC,POS_UTC,POS_STAT,LAT,LAT_REF,LON,LON_REF,SPD,HDG,DATE,MAG_VAR,MAG_REF*CC<cr><lf> -$GPGLL,LAT,LAT_REF,LONG,LONG_REF,POS_UTC,POS_STAT*CC<cr><lf> -$GPGGA,POS_UTC,LAT,LAT_REF,LONG,LONG_REF,FIX_MODE,SAT_USED,HDOP,ALT,ALT_UNIT,GEO,G_UNIT,D_AGE,D_REF*CC<cr><lf> - - POS_UTC - UTC of position. Hours, minutes and seconds [fraction (opt.)]. (hhmmss[.fff]) - POS_STAT - Position status. (A = Data valid, V = Data invalid) - LAT - Latitude (llll.ll) - LAT_REF - Latitude direction. (N = North, S = South) - LON - Longitude (yyyyy.yy) - LON_REF - Longitude direction (E = East, W = West) - SPD - Speed over ground. (knots) (x.x) - HDG - Heading/track made good (degrees True) (x.x) - DATE - Date (ddmmyy) - MAG_VAR - Magnetic variation (degrees) (x.x) - MAG_REF - Magnetic variation (E = East, W = West) - FIX_MODE - Position Fix Mode ( 0 = Invalid, >0 = Valid) - SAT_USED - Number Satellites used in solution - HDOP - Horizontal Dilution of Precision - ALT - Antenna Altitude - ALT_UNIT - Altitude Units (Metres/Feet) - GEO - Geoid/Elipsoid separation - G_UNIT - Geoid units (M/F) - D_AGE - Age of last DGPS Fix - D_REF - Reference ID of DGPS station - CC - Checksum (optional) - <cr><lf> - Sentence terminator.</tt></pre> -Alternate GPS sentences (other than <tt>$GPRMC</tt> - the default) may -be enabled by setting the relevent bits of 'mode' in the server configuration -line -<br> * server 127.127.20.x mode X -<br> bit 0 - enables RMC ( value = -1) -<br> bit 1 - enables GGA ( value = -2) -<br> bit 2 - enables GLL -( value = 4) -<br>multiple sentences may be selected -<br> -<p>The driver will send a <tt>$PMOTG,RMC,0000*1D<cr><lf></tt> message -each time a <tt>$GPRMC</tt> string is needed. This is not needed on most -GPS receivers because they automatically send the <tt>$GPRMC</tt> string -every second and will only work on GPS receivers that understand the <tt>$PMOTG</tt> -string. Others will just ignore it. -<h4> -Setting up the Garmin GPS-25XL</h4> -Switch off all output with by sending it the following string. -<pre>"$PGRMO,,2<cr><lf>"</pre> -Now switch only $GPRMC on by sending it the following string. -<pre>"$PGRMO,GPRMC,1<cr><lf>"</pre> -On some systems the PPS signal isn't switched on by default. It can be -switched on by sending the following string. -<pre>"$PGRMC,,,,,,,,,,,,2<cr><lf>"</pre> - -<h4> -Monitor Data</h4> -The GPS sentence(s) that is used is written to the clockstats file. -<h4> -Fudge Factors</h4> - -<dl> -<dt> -<tt>time1 <i>time</i></tt></dt> - -<dd> -Specifies the time offset calibration factor, in seconds and fraction, -with default 0.0.</dd> - -<dt> -<tt>time2 <i>time</i></tt></dt> - -<dd> -Not used by this driver.</dd> - -<dt> -<tt>stratum <i>number</i></tt></dt> - -<dd> -Specifies the driver stratum, in decimal from 0 to 15, with default 0.</dd> - -<dt> -<tt>refid <i>string</i></tt></dt> - -<dd> -Specifies the driver reference identifier, an ASCII string from one to -four characters, with default <tt>GPS</tt>.</dd> - -<dt> -<tt>flag1 0 | 1</tt></dt> - -<dd> -Not used by this driver.</dd> - -<dt> -<tt>flag2 0 | 1</tt></dt> - -<dd> -Specifies the PPS signal on-time edge: 0 for assert (default), 1 for clear.</dd> - -<dt> -<tt>flag3 0 | 1</tt></dt> - -<dd> -Controls the kernel PPS discipline: 0 for disable (default), 1 for enable.</dd> - -<dt> -<tt>flag4 0 | 1</tt></dt> - -<dd> -Not used by this driver.</dd> - -<br> -<p> -<br> -<br> -<p>Additional Information -<p><a href="refclock.htm">Reference Clock Drivers</a></dl> - -<hr> -<address> -David L. Mills (mills@udel.edu)</address> - -</body> -</html> |
