150 lines
5.7 KiB
Plaintext
150 lines
5.7 KiB
Plaintext
Radio Timecode Formats (README.timecodes)
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Following are examples of the serial timecode formats used by various
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timecode receivers as given in the instruction manuals. These examples
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are intended only for illustration and not as the basis of system
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design. The following symbols are used to identify the timecode
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character that begins a subfield. The values given after this symbol
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represent the character offset from the beginning of the timecode string
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as edited to remove control characters.
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C on-time character (start bit)
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Y year of century
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T time of day
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D day of year or month/day
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A alarm indicator (format specific)
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Q quality indicator (format specific)
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<LF> ASCII line feed (hex 0a)
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<CR> ASCII carriage return (hex 0d)
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<SP> ASCII space (hex 20)
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In order to promote uniform behavior in the various implementations, it
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is useful to have a common interpretation of alarm conditions and signal
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quality. When the alarm indicator it on, the receiver is not operating
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correctly or has never synchronized to the broadcast signal. When the
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alarm indicator is off and the quality indicator is on, the receiver has
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synchronized to the broadcast signal, then lost the signal and is
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coasting on its internal oscillator.
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In the following uppercase letters, punctuation marks and spaces <SP>
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stand for themselves; lowercase letters stand for fields as described.
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Special characters other than <LF>, <CR> and <SP> are preceded by ^.
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Spectracom 8170 and Netclock/2 WWV Synchonized Clock (format 0)
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"<CR><LF>i ddd hh:mm:ss TZ=zz<CR><LF>"
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C A D T
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poll: ?; offsets: Y = none, D = 3, T = 7, A = 0, Q = none
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i = synchronization flag (<SP> = in synch, ? = out synch)
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ddd = day of year
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hh:mm:ss = hours, minutes, seconds
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zz = timezone offset (hours from UTC)
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Note: alarm condition is indicated by other than <SP> at A, which
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occurs during initial synchronization and when received signal has
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been lost for about ten hours
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example: " 216 15:36:43 TZ=0"
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A D T
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Netclock/2 WWV Synchonized Clock (format 2)
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"<CR><LF>iqyy ddd hh:mm:ss.fff ld"
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C AQY D T
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poll: ?; offsets: Y = 2, D = 5, T = 9, A = 0, Q = 1
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i = synchronization flag (<SP> = in synch, ? = out synch)
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q = quality indicator (<SP> < 1ms, A < 10 ms, B < 100 ms, C < 500
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ms, D > 500 ms)
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yy = year (as broadcast)
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ddd = day of year
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hh:mm:ss.fff = hours, minutes, seconds, milliseconds of day
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l = leap-second warning (L indicates leap at end of month)
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d = standard/daylight time indicator (<SP> standard, D daylight)
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Note: alarm condition is indicated by other than <SP> at A, which
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occurs during initial synchronization and when received signal has
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been lost for about ten hours; unlock condition is indicated by
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other than <SP> at Q, with time since last lock indicated by the
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letter code A < 13 min, B < 1.5 hr, C < 7 hr, D > 7 hr.
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example: " 92 216 15:36:43.640 D"
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AQ D T
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TrueTime 468-DC Satellite Synchronized Clock (and other TrueTime
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receivers)
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"<CR><LF><^A>ddd:hh:mm:ssq<CR>"
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D T QC
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poll: none; offsets: Y = none, D = 0, T = 4, A = 12, Q = 12
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hh:mm:ss = hours, minutes, seconds
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q = quality/alarm indicator (<SP> = locked, ? = alarm)
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Note: alarm condition is indicated by ? at A, which occurs during
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initial synchronization and when received signal is lost for an
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extended period; unlock condition is indicated by other than <SP>
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at Q
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example: "216:15:36:43 "
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D T Q
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Heath GC-1000 Most Accurate Clock (WWV/H)
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"<CR>hh:mm:ss.f dd/mm/yy<CR>"
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C T A D
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poll: none; offsets: Y = none, D = 15, T = 0, A = 9, Q = none
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hh:mm:ss = hours, minutes, seconds
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f = deciseconds (? when out of spec)
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dd/mm = day, month
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yy = year of century (from DIPswitches)
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Note: 0?:??:??.? is displayed before synch is first established and
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hh:mm:ss.? once synch is established and then lost again for about
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a day.
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example: "15:36:43.6 04/08/91"
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T A D Y
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PST/Traconex 1020 Time Source (WWV/H) (firmware revision V4.01)
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"frdzycchhSSFTttttuuxx<CR>" "ahh:mm:ss.fffs<CR>" "yy/dd/mm/ddd<CR>"
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A Q T Y D
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poll: "QMQDQT"; offsets: Y = 0, D = 3 T = 1,, A = 11, Q = 13
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f = frequency enable (O = all frequencies enabled)
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r = baud rate (3 = 1200, 6 = 9600)
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d = features indicator (@ = month/day display enabled)
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z = time zone (0 = UTC)
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y = year (5 = 1991)
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cc = WWV propagation delay (52 = 22 ms)
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hh = WWVH propagation delay (81 = 33 ms)
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SS = status (80 or 82 = operating correctly)
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F = current receive frequency (1-5 = 2.5, 5, 10, 15, 20 MHz)
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T = transmitter (C = WWV, H = WWVH)
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tttt = time since last update (minutes)
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uu = flush character (03 = ^C)
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xx = 94 (unknown) (firmware revision X4.01.999 only)
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a = AM/PM indicator (A = AM, P = PM, <SP> - 24-hour format)
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hh:mm:ss.fff = hours, minutes, seconds, milliseconds of day
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s = daylight-saving indicator (<SP> standard, D daylight)
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yy = year of century (from DIPswitches)
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dd/mm/ddd = day of month, month of year, day of year
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Note: The alarm condition is indicated by other than ? at A, which
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occurs during initial synchronization and when received signal is
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lost for an extended period. A receiver unlock condition is
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indicated by other than "0000" in the tttt subfield at Q.
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example: "O3@055281824C00000394 91/08/04/216 15:36:43.640"
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T Y D T
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David L. Mills
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University of Delaware
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mills@udel.edu
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23 October 1993
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