diff options
Diffstat (limited to 'contrib/ntp/html/driver19.htm')
| -rw-r--r-- | contrib/ntp/html/driver19.htm | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/contrib/ntp/html/driver19.htm b/contrib/ntp/html/driver19.htm deleted file mode 100644 index a5cd5e0..0000000 --- a/contrib/ntp/html/driver19.htm +++ /dev/null @@ -1,124 +0,0 @@ -<HTML> -<HEAD> - <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> - <META NAME="GENERATOR" CONTENT="Mozilla/4.01 [en] (Win95; I) [Netscape]"> - <TITLE>Heath WWV/WWVH Receiver -</TITLE> -</HEAD> -<BODY> - -<H3> -Heath WWV/WWVH Receiver</H3> - -<HR> -<H4> -Synopsis</H4> -Address: 127.127.19.<I>u</I> -<BR>Reference ID: <TT>WWV</TT> -<BR>Driver ID: <TT>WWV_HEATH</TT> -<BR>Serial Port: <TT>/dev/heath<I>u</I></TT>; 1200 baud, 8-bits, no parity -<BR>Features: <TT>tty_clk</TT> -<BR>Requires: <TT>/usr/include/sys/termios.h</TT> header file with modem -control -<H4> -Description</H4> -This driver supports the Heath GC-1000 Most Accurate Clock, with RS232C -Output Accessory. This is a WWV/WWVH receiver somewhat less robust than -other supported receivers. Its claimed accuracy is 100 ms when actually -synchronized to the broadcast signal, but this doesn't happen even most -of the time, due to propagation conditions, ambient noise sources, etc. -When not synchronized, the accuracy is at the whim of the internal clock -oscillator, which can wander into the sunset without warning. Since the -indicated precision is 100 ms, expect a host synchronized only to this -thing to wander to and fro, occasionally being rudely stepped when the -offset exceeds the default CLOCK_MAX of 128 ms. - -<P>The internal DIPswitches should be set to operate at 1200 baud in MANUAL -mode and the current year. The external DIPswitches should be set to GMT -and 24-hour format. It is very important that the year be set correctly -in the DIPswitches; otherwise, the day of year will be incorrect after -28 April of a normal or leap year. - -<P>In MANUAL mode the clock responds to a rising edge of the request to -send (RTS) modem control line by sending the timecode. Therefore, it is -necessary that the operating system implement the <TT>TIOCMBIC</TT> and -<TT>TIOCMBIS</TT> ioctl system calls and <TT>TIOCM_RTS</TT> control bit. -Present restrictions require the use of a POSIX-compatible programming -interface, although other interfaces may work as well. - -<P>The clock message consists of 23 ASCII printing characters in the following -format: -<PRE>hh:mm:ss.f dd/mm/yr<cr> - -hh:mm:ss.f = hours, minutes, seconds -f = deciseconds ('?' when out of spec) -dd/mm/yr = day, month, year</PRE> -The alarm condition is indicated by '?', rather than a digit, at A. Note -that 0?:??:??.? is displayed before synchronization is first established -and hh:mm:ss.? once synchronization is established and then lost again -for about a day. - -<P>A fudge time1 value of .07 s appears to center the clock offset residuals. -<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>WWV</TT>.</DD> - -<DT> -<TT>flag1 0 | 1</TT></DT> - -<DD> -Not used by this driver.</DD> - -<DT> -<TT>flag2 0 | 1</TT></DT> - -<DD> -Not used by this driver.</DD> - -<DT> -<TT>flag3 0 | 1</TT></DT> - -<DD> -Not used by this driver.</DD> - -<DT> -<TT>flag4 0 | 1</TT></DT> - -<DD> -Not used by this driver</DD> -</DL> -Additional Information - -<P><A HREF="refclock.htm">Reference Clock Drivers</A> -<HR> -<ADDRESS> -David L. Mills (mills@udel.edu)</ADDRESS> - -</BODY> -</HTML> |
