115 lines
3.2 KiB
HTML
115 lines
3.2 KiB
HTML
<HTML>
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<HEAD>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
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<META NAME="GENERATOR" CONTENT="Mozilla/4.01 [en] (Win95; I) [Netscape]">
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<TITLE>Austron 2200A/2201A GPS Receivers
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</TITLE>
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</HEAD>
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<BODY>
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<H3>
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Austron 2200A/2201A GPS Receivers</H3>
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<HR>
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<H4>
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Synopsis</H4>
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Address: 127.127.10.<I>u</I>
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<BR>Reference ID: <TT>GPS</TT>
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<BR>Driver ID: <TT>GPS_AS2201</TT>
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<BR>Serial Port: <TT>/dev/gps<I>u</I></TT>; 9600 baud, 8-bits, no parity
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<BR>Features: <TT>tty_clk</TT>
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<H4>
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Description</H4>
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This driver supports the Austron 2200A/2201A GPS/LORAN Synchronized Clock
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and Timing Receiver connected via a serial port. It supports several special
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features of the clock, including the Input Buffer Module, Output Buffer
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Module, IRIG-B Interface Module and LORAN Assist Module. It requires the
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RS232 Buffered Serial Interface module for communication with the driver.
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For operation with multiple computers, it requires the <TT>ppsclock</TT>
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streams module described in the <A HREF="ldisc.htm">Line Disciplines and
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Streams Modules</A> page. The streams module requires a gadget box and
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1-PPS level converter, such as described in the <A HREF="pps.htm">Pulse-per-second
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(PPS) Signal Interfacing</A> page.
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<P>For use with a single computer, the receiver can be connected directly
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to the receiver. For use with multiple computers, one of them is connected
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directly to the receiver and generates the polling messages. The other
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computers just listen to the receiver output directly or through a buffer
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amplifier. For computers that just listen, <TT>fudge flag2</TT> must be
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set and the <TT>ppsclock </TT>streams module configured on each of them.
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<P>This receiver is capable of a comprehensive and large volume of statistics
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and operational data. The specific data collection commands and attributes
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are embedded in the driver source code; however, the collection process
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can be enabled or disabled using the flag4 flag. If set, collection is
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enabled; if not, which is the default, it is disabled. A comprehensive
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suite of data reduction and summary scripts is in the ./scripts/stats directory
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of the ntp3 distribution.
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<H4>
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Monitor Data</H4>
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When enabled by the <TT>flag4</TT> fudge flag, every received timecode
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is written as-is to the <TT>clockstats</TT> file.
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<H4>
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Fudge Factors</H4>
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<DL>
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<DT>
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<TT>time1 <I>time</I></TT></DT>
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<DD>
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Specifies the time offset calibration factor, in seconds and fraction,
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with default 0.0.</DD>
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<DT>
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<TT>time2 <I>time</I></TT></DT>
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<DD>
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Not used by this driver.</DD>
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<DT>
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<TT>stratum <I>number</I></TT></DT>
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<DD>
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Specifies the driver stratum, in decimal from 0 to 15, with default 0.</DD>
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<DT>
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<TT>refid <I>string</I></TT></DT>
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<DD>
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Specifies the driver reference identifier, an ASCII string from one to
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four characters, with default <TT>GPS</TT>.</DD>
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<DT>
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<TT>flag1 0 | 1</TT></DT>
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<DD>
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Not used by this driver.</DD>
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<DT>
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<TT>flag2 0 | 1</TT></DT>
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<DD>
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Set for computers that listen-only.</DD>
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<DT>
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<TT>flag3 0 | 1</TT></DT>
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<DD>
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Not used by this driver.</DD>
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<DT>
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<TT>flag4 0 | 1</TT></DT>
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<DD>
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Enable verbose <TT>clockstats</TT> recording if set.</DD>
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</DL>
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Additional Information
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<P><A HREF="refclock.htm">Reference Clock Drivers</A>
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<HR>
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<ADDRESS>
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David L. Mills (mills@udel.edu)</ADDRESS>
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</BODY>
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</HTML>
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