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5 | <TITLE>Austron 2200A/2201A GPS Receivers |
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7 | </HEAD> |
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8 | <BODY> |
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9 | |
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10 | <H3> |
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11 | Austron 2200A/2201A GPS Receivers</H3> |
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12 | |
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13 | <HR> |
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14 | <H4> |
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15 | Synopsis</H4> |
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16 | Address: 127.127.10.<I>u</I> |
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17 | <BR>Reference ID: <TT>GPS</TT> |
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18 | <BR>Driver ID: <TT>GPS_AS2201</TT> |
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19 | <BR>Serial Port: <TT>/dev/gps<I>u</I></TT>; 9600 baud, 8-bits, no parity |
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20 | <BR>Features: <TT>tty_clk</TT> |
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21 | <H4> |
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22 | Description</H4> |
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23 | This driver supports the Austron 2200A/2201A GPS/LORAN Synchronized Clock |
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24 | and Timing Receiver connected via a serial port. It supports several special |
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25 | features of the clock, including the Input Buffer Module, Output Buffer |
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26 | Module, IRIG-B Interface Module and LORAN Assist Module. It requires the |
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27 | RS232 Buffered Serial Interface module for communication with the driver. |
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28 | For operation with multiple computers, it requires the <TT>ppsclock</TT> |
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29 | streams module described in the <A HREF="ldisc.htm">Line Disciplines and |
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30 | Streams Modules</A> page. The streams module requires a gadget box and |
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31 | 1-PPS level converter, such as described in the <A HREF="pps.htm">Pulse-per-second |
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32 | (PPS) Signal Interfacing</A> page. |
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33 | |
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34 | <P>For use with a single computer, the receiver can be connected directly |
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35 | to the receiver. For use with multiple computers, one of them is connected |
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36 | directly to the receiver and generates the polling messages. The other |
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37 | computers just listen to the receiver output directly or through a buffer |
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38 | amplifier. For computers that just listen, <TT>fudge flag2</TT> must be |
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39 | set and the <TT>ppsclock </TT>streams module configured on each of them. |
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40 | |
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41 | <P>This receiver is capable of a comprehensive and large volume of statistics |
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42 | and operational data. The specific data collection commands and attributes |
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43 | are embedded in the driver source code; however, the collection process |
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44 | can be enabled or disabled using the flag4 flag. If set, collection is |
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45 | enabled; if not, which is the default, it is disabled. A comprehensive |
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46 | suite of data reduction and summary scripts is in the ./scripts/stats directory |
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47 | of the ntp3 distribution. |
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48 | <H4> |
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49 | Monitor Data</H4> |
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50 | When enabled by the <TT>flag4</TT> fudge flag, every received timecode |
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51 | is written as-is to the <TT>clockstats</TT> file. |
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52 | <H4> |
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53 | Fudge Factors</H4> |
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54 | |
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55 | <DL> |
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56 | <DT> |
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57 | <TT>time1 <I>time</I></TT></DT> |
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58 | |
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59 | <DD> |
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60 | Specifies the time offset calibration factor, in seconds and fraction, |
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61 | with default 0.0.</DD> |
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62 | |
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63 | <DT> |
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64 | <TT>time2 <I>time</I></TT></DT> |
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65 | |
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66 | <DD> |
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67 | Not used by this driver.</DD> |
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68 | |
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69 | <DT> |
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70 | <TT>stratum <I>number</I></TT></DT> |
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71 | |
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72 | <DD> |
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73 | Specifies the driver stratum, in decimal from 0 to 15, with default 0.</DD> |
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74 | |
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75 | <DT> |
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76 | <TT>refid <I>string</I></TT></DT> |
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77 | |
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78 | <DD> |
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79 | Specifies the driver reference identifier, an ASCII string from one to |
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80 | four characters, with default <TT>GPS</TT>.</DD> |
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81 | |
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82 | <DT> |
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83 | <TT>flag1 0 | 1</TT></DT> |
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84 | |
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85 | <DD> |
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86 | Not used by this driver.</DD> |
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87 | |
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88 | <DT> |
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89 | <TT>flag2 0 | 1</TT></DT> |
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90 | |
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91 | <DD> |
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92 | Set for computers that listen-only.</DD> |
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93 | |
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94 | <DT> |
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95 | <TT>flag3 0 | 1</TT></DT> |
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96 | |
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97 | <DD> |
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98 | Not used by this driver.</DD> |
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99 | |
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100 | <DT> |
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101 | <TT>flag4 0 | 1</TT></DT> |
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102 | |
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103 | <DD> |
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104 | Enable verbose <TT>clockstats</TT> recording if set.</DD> |
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105 | </DL> |
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106 | Additional Information |
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107 | |
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108 | <P><A HREF="refclock.htm">Reference Clock Drivers</A> |
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109 | <HR> |
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110 | <ADDRESS> |
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111 | David L. Mills (mills@udel.edu)</ADDRESS> |
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112 | |
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113 | </BODY> |
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114 | </HTML> |
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