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5   <TITLE>Austron 2200A/2201A GPS Receivers
6</TITLE>
7</HEAD>
8<BODY>
9
10<H3>
11Austron 2200A/2201A GPS Receivers</H3>
12
13<HR>
14<H4>
15Synopsis</H4>
16Address: 127.127.10.<I>u</I>
17<BR>Reference ID: <TT>GPS</TT>
18<BR>Driver ID: <TT>GPS_AS2201</TT>
19<BR>Serial Port: <TT>/dev/gps<I>u</I></TT>; 9600 baud, 8-bits, no parity
20<BR>Features: <TT>tty_clk</TT>
21<H4>
22Description</H4>
23This driver supports the Austron 2200A/2201A GPS/LORAN Synchronized Clock
24and Timing Receiver connected via a serial port. It supports several special
25features of the clock, including the Input Buffer Module, Output Buffer
26Module, IRIG-B Interface Module and LORAN Assist Module. It requires the
27RS232 Buffered Serial Interface module for communication with the driver.
28For operation with multiple computers, it requires the <TT>ppsclock</TT>
29streams module described in the <A HREF="ldisc.htm">Line Disciplines and
30Streams Modules</A> page. The streams module requires a gadget box and
311-PPS level converter, such as described in the <A HREF="pps.htm">Pulse-per-second
32(PPS) Signal Interfacing</A> page.
33
34<P>For use with a single computer, the receiver can be connected directly
35to the receiver. For use with multiple computers, one of them is connected
36directly to the receiver and generates the polling messages. The other
37computers just listen to the receiver output directly or through a buffer
38amplifier. For computers that just listen, <TT>fudge flag2</TT> must be
39set and the <TT>ppsclock </TT>streams module configured on each of them.
40
41<P>This receiver is capable of a comprehensive and large volume of statistics
42and operational data. The specific data collection commands and attributes
43are embedded in the driver source code; however, the collection process
44can be enabled or disabled using the flag4 flag. If set, collection is
45enabled; if not, which is the default, it is disabled. A comprehensive
46suite of data reduction and summary scripts is in the ./scripts/stats directory
47of the ntp3 distribution.
48<H4>
49Monitor Data</H4>
50When enabled by the <TT>flag4</TT> fudge flag, every received timecode
51is written as-is to the <TT>clockstats</TT> file.
52<H4>
53Fudge Factors</H4>
54
55<DL>
56<DT>
57<TT>time1 <I>time</I></TT></DT>
58
59<DD>
60Specifies the time offset calibration factor, in seconds and fraction,
61with default 0.0.</DD>
62
63<DT>
64<TT>time2 <I>time</I></TT></DT>
65
66<DD>
67Not used by this driver.</DD>
68
69<DT>
70<TT>stratum <I>number</I></TT></DT>
71
72<DD>
73Specifies the driver stratum, in decimal from 0 to 15, with default 0.</DD>
74
75<DT>
76<TT>refid <I>string</I></TT></DT>
77
78<DD>
79Specifies the driver reference identifier, an ASCII string from one to
80four characters, with default <TT>GPS</TT>.</DD>
81
82<DT>
83<TT>flag1 0 | 1</TT></DT>
84
85<DD>
86Not used by this driver.</DD>
87
88<DT>
89<TT>flag2 0 | 1</TT></DT>
90
91<DD>
92Set for computers that listen-only.</DD>
93
94<DT>
95<TT>flag3 0 | 1</TT></DT>
96
97<DD>
98Not used by this driver.</DD>
99
100<DT>
101<TT>flag4 0 | 1</TT></DT>
102
103<DD>
104Enable verbose <TT>clockstats</TT> recording if set.</DD>
105</DL>
106Additional Information
107
108<P><A HREF="refclock.htm">Reference Clock Drivers</A>&nbsp;
109<HR>
110<ADDRESS>
111David L. Mills (mills@udel.edu)</ADDRESS>
112
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