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Tue May 29 12:08:38 2012 UTC (12 years, 5 months ago) by misho
Branches: ntp, MAIN
CVS tags: v4_2_6p5p0, v4_2_6p5, HEAD

ntp 4.2.6p5

1: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2: 3: <html> 4: 5: <head> 6: <meta http-equiv="content-type" content="text/html;charset=iso-8859-1"> 7: <meta name="generator" content="HTML Tidy, see www.w3.org"> 8: <title>NTP PARSE clock data formats</title> 9: <link href="scripts/style.css" type="text/css" rel="stylesheet"> 10: </head> 11: 12: <body> 13: <h3>NTP PARSE clock data formats</h3> 14: The parse driver currently supports several clocks with different query mechanisms. In order for you to find a sample that might be similar to a clock you might want to integrate into parse I'll sum up the major features of the clocks (this information is distributed in the parse/clk_*.c and ntpd/refclock_parse.c files). 15: <hr> 16: <h4>Meinberg clocks</h4> 17: <pre> 18: Meinberg: start=<STX>, end=<ETX>, sync on start 19: pattern="\2D: . . ;T: ;U: . . ; \3" 20: pattern="\2 . . ; ; : : ; \3" 21: pattern="\2 . . ; ; : : ; : ; ; . . " 22: </pre> 23: Meinberg is a German manufacturer of time code receivers. Those clocks have a pretty common output format in the stock version. In order to support NTP Meinberg was so kind to produce some special versions of the firmware for the use with NTP. So, if you are going to use a Meinberg clock please ask whether there is a special Uni Erlangen version. You can reach <a href="http://www.meinberg.de/">Meinberg</a> via the Web. Information can also be ordered via eMail from <a href="mailto:%20info@meinberg.de">info@meinberg.de</a> 24: General characteristics:  25: Meinberg clocks primarily output pulse per second and a describing ASCII string. This string can be produced in two modes: either upon the reception of a question mark or every second. NTP uses the latter mechanism. DCF77 AM clocks have a limited accuracy of a few milliseconds. The DCF77 PZF5xx variants provide higher accuracy and have a pretty good relationship between RS232 time code and the PPS signal. Except for early versions of the old GPS166 receiver type, Meinberg GPS receivers have a very good timing relationship between the datagram and the pulse. The beginning of the start bit of the first character has basically the same accuracy as the PPS signal, plus a jitter of up to 1 bit time depending on the selected baud rate, i.e. 52 μs @ 19200. PPS support should always be used, if possible, in order to yield the highest possible accuracy. 26: The preferred tty setting for Meinberg DCF77 receivers is 9600/7E2: 27: <pre> 28: CFLAG (B9600|CS7|PARENB|CREAD|HUPCL) 29: IFLAG (IGNBRK|IGNPAR|ISTRIP) 30: OFLAG 0 31: LFLAG 0 32: </pre> 33: The tty setting for Meinberg GPS16x/17x receivers is 19200/8N1: 34: <pre> 35: CFLAG (B19200|CS8|PARENB|CREAD|HUPCL) 36: IFLAG (IGNBRK|IGNPAR|ISTRIP) 37: OFLAG 0 38: LFLAG 0 39: </pre> 40: All clocks should be run at datagram once per second.   41: Format of the Meinberg standard time string: 42: <pre> 43: <STX>D:dd.mm.yy;T:w;U:hh.mm.ss;uvxy<ETX> 44: pos: 0 000000001111111111222222222233 3 45: 1 234567890123456789012345678901 2 46: 47: <STX> = start-of-text, ASCII code 0x02 48: dd.mm.yy = day of month, month, year of the century, separated by dots 49: w = day of week (1..7, Monday = 1) 50: hh:mm:ss = hour, minute, second, separated by dots 51: u = '#' for GPS receivers: time is not synchronized 52: '#' for older PZF5xx receivers: no correlation, not synchronized 53: '#' for other devices: never sync'ed since powerup 54: ' ' if nothing of the above applies 55: v = '*' for GPS receivers: position has not been verified 56: '*' for other devices: freewheeling based on internal quartz 57: ' ' if nothing of the above applies 58: x = 'U' if UTC time is transmitted 59: 'S' if daylight saving time is active 60: ' ' if nothing of the above applies 61: y = '!' during the hour preceding start or end of daylight saving time 62: 'A' during the hour preceding a leap second 63: ' ' if nothing of the above applies 64: <ETX> = end-of-text, ASCII code 0x03 65: </pre> 66: Format of the Uni Erlangen time string for PZF5xx receivers: 67: <pre> 68: <STX>dd.mm.yy; w; hh:mm:ss; tuvxyza<ETX> 69: pos: 0 000000001111111111222222222233 3 70: 1 234567890123456789012345678901 2 71: 72: <STX> = start-of-text, ASCII code 0x02 73: dd.mm.yy = day of month, month, year of the century, separated by dots 74: w = day of week (1..7, Monday = 1) 75: hh:mm:ss = hour, minute, second, separated by colons 76: 77: t = 'U' if UTC time is transmitted, else ' ' 78: u = '#' for older PZF5xx receivers: no correlation, not synchronized 79: '#' for PZF511 and newer: never sync'ed since powerup 80: ' ' if nothing of the above applies 81: v = '*' if freewheeling based on internal quartz, else ' ' 82: x = 'S' if daylight saving time is active, else ' ' 83: y = '!' during the hour preceding start or end of daylight saving time, else ' ' 84: z = 'A' during the hour preceding a leap second, else ' ' 85: a = 'R' alternate antenna (reminiscent of PZF5xx), usually ' ' for GPS receivers 86: <ETX> = end-of-text, ASCII code 0x03 87: </pre> 88: Format of the Uni Erlangen time string for GPS16x/GPS17x receivers: 89: <pre> 90: <STX>dd.mm.yy; w; hh:mm:ss; +uu:uu; uvxyzab; ll.lllln lll.lllle hhhhm<ETX> 91: pos: 0 0000000011111111112222222222333333333344444444445555555555666666 6 92: 1 2345678901234567890123456789012345678901234567890123456789012345 6 93: 94: <STX> = start-of-text, ASCII code 0x02 95: dd.mm.yy = day of month, month, year of the century, separated by dots 96: w = day of week (1..7, Monday = 1) 97: hh:mm:ss = hour, minute, second, separated by colons 98: +uu:uu = offset to UTC in hours and minutes, preceded by + or - 99: u = '#' if time is not synchronized, else ' ' 100: v = '*' if position has not been verified, else ' ' 101: x = 'S' if daylight saving time is active, else ' ' 102: y = '!' during the hour preceding start or end of daylight saving time, else ' ' 103: z = 'A' during the hour preceding a leap second, else ' ' 104: a = 'R' alternate antenna (reminiscent of PZF5xx), usually ' ' for GPS receivers 105: b = 'L' during a leap second, i.e. if the seconds field is 60, else ' ' 106: ll.lllln = position latitude in degrees, 'n' can actually be 'N' or 'S', i.e. North or South 107: lll.lllle = position longitude in degrees, 'e' can actually be 'E' or 'W', i.e. East or West 108: hhhh = position altitude in meters, always followed by 'm' 109: <ETX> = end-of-text, ASCII code 0x03 110: </pre> 111: Examples for Uni Erlangen strings from GPS receivers: 112: <pre> 113: \x02 09.07.93; 5; 08:48:26; +00:00; ; 49.5736N 11.0280E 373m \x03 114: \x02 08.11.06; 3; 14:39:39; +00:00; ; 51.9828N 9.2258E 176m \x03 115: </pre> 116: The Uni Erlangen formats should be used preferably. Newer Meinberg GPS receivers can be configured to transmit that format, for older devices there may be a special firmware version available. 117: For the Meinberg parse look into clk_meinberg.c   118: <hr> 119: <h4>Raw DCF77 Data via serial line</h4> 120: RAWDCF: end=TIMEOUT>1.5s, sync each char (any char),generate psuedo time codes, fixed format 121: direct DCF77 code input 122: In Europe it is relatively easy/cheap the receive the german time code transmitter DCF77. The simplest version to process its signal is to feed the 100/200ms pulse of the demodulated AM signal via a level converter to an RS232 port at 50Baud. parse/clk_rawdcf.c holds all necessary decoding logic for the time code which is transmitted each minute for one minute. A bit of the time code is sent once a second. 123: <pre> 124: The preferred tty setting is: 125: CFLAG (B50|CS8|CREAD|CLOCAL) 126: IFLAG 0 127: OFLAG 0 128: LFLAG 0 129: </pre> 130: <h4>DCF77 raw time code</h4> 131: From "Zur Zeit", Physikalisch-Technische Bundesanstalt (PTB), Braunschweig und Berlin, März 1989 132:  133: Timecode transmission: 134: <pre> 135: AM: 136: 137: time marks are send every second except for the second before the 138: next minute mark 139: time marks consist of a reduction of transmitter power to 25% 140: of the nominal level 141: the falling edge is the time indication (on time) 142: time marks of a 100ms duration constitute a logical 0 143: time marks of a 200ms duration constitute a logical 1 144: </pre> 145: see the spec. (basically a (non-)inverted psuedo random phase shift) encoding: 146: <pre> 147: FM: 148: 149: Second Contents 150: 0 - 10 AM: free, FM: 0 151: 11 - 14 free 152: 15 R - alternate antenna 153: 16 A1 - expect zone change (1 hour before) 154: 17 - 18 Z1,Z2 - time zone 155: 0 0 illegal 156: 0 1 MEZ (MET) 157: 1 0 MESZ (MED, MET DST) 158: 1 1 illegal 159: 19 A2 - expect leap insertion/deletion (1 hour before) 160: 20 S - start of time code (1) 161: 21 - 24 M1 - BCD (lsb first) Minutes 162: 25 - 27 M10 - BCD (lsb first) 10 Minutes 163: 28 P1 - Minute Parity (even) 164: 29 - 32 H1 - BCD (lsb first) Hours 165: 33 - 34 H10 - BCD (lsb first) 10 Hours 166: 35 P2 - Hour Parity (even) 167: 36 - 39 D1 - BCD (lsb first) Days 168: 40 - 41 D10 - BCD (lsb first) 10 Days 169: 42 - 44 DW - BCD (lsb first) day of week (1: Monday -> 7: Sunday) 170: 45 - 49 MO1 - BCD (lsb first) Month 171: 50 MO10 - 10 Months 172: 51 - 53 Y1 - BCD (lsb first) Years 173: 54 - 57 Y10 - BCD (lsb first) 10 Years 174: 58 P3 - Date Parity (even) 175: 59 - usually missing (minute indication), except for leap insertion 176: </pre> 177: <hr> 178: <h4>Schmid clock</h4> 179: Schmid clock: needs poll, binary input, end='\xFC', sync start 180: The Schmid clock is a DCF77 receiver that sends a binary time code at the reception of a flag byte. The contents if the flag byte determined the time code format. The binary time code is delimited by the byte 0xFC. 181: <pre> 182: TTY setup is: 183: CFLAG (B1200|CS8|CREAD|CLOCAL) 184: IFLAG 0 185: OFLAG 0 186: LFLAG 0 187: 188: </pre> 189: The command to Schmid's DCF77 clock is a single byte; each bit allows the user to select some part of the time string, as follows (the output for the lsb is sent first). 190: <pre> 191: Bit 0: time in MEZ, 4 bytes *binary, not BCD*; hh.mm.ss.tenths 192: Bit 1: date 3 bytes *binary, not BCD: dd.mm.yy 193: Bit 2: week day, 1 byte (unused here) 194: Bit 3: time zone, 1 byte, 0=MET, 1=MEST. (unused here) 195: Bit 4: clock status, 1 byte, 0=time invalid, 196: 1=time from crystal backup, 197: 3=time from DCF77 198: Bit 5: transmitter status, 1 byte, 199: bit 0: backup antenna 200: bit 1: time zone change within 1h 201: bit 3,2: TZ 01=MEST, 10=MET 202: bit 4: leap second will be 203: added within one hour 204: bits 5-7: Zero 205: Bit 6: time in backup mode, units of 5 minutes (unused here) 206: </pre> 207: <hr> 208: <h4>Trimble SV6 ASCII time code (TAIP)</h4> 209: Trimble SV6: needs poll, ascii timecode, start='>', end='<', query='>QTM<', eol='<' 210: Trimble SV6 is a GPS receiver with PPS output. It needs to be polled. It also need a special tty mode setup (EOL='<'). 211: <pre> 212: TTY setup is: 213: CFLAG (B4800|CS8|CREAD) 214: IFLAG (BRKINT|IGNPAR|ISTRIP|ICRNL|IXON) 215: OFLAG (OPOST|ONLCR) 216: LFLAG (ICANON|ECHOK) 217: </pre> 218: Special flags are: 219: <pre> PARSE_F_PPSPPS - use CIOGETEV for PPS time stamping 220: PARSE_F_PPSONSECOND - the time code is not related to 221: the PPS pulse (so use the time code 222: only for the second epoch) 223: 224: Timecode 225: 0000000000111111111122222222223333333 / char 226: 0123456789012345678901234567890123456 \ posn 227: >RTMhhmmssdddDDMMYYYYoodnnvrrrrr;*xx< Actual 228: ----33445566600112222BB7__-_____--99- Parse 229: >RTM 1 ;* < Check 230: </pre> 231: <hr> 232: <h4>ELV DCF7000</h4> 233: ELV DCF7000: end='\r', pattern=" - - - - - - - \r" 234: The ELV DCF7000 is a cheap DCF77 receiver sending each second a time code (though not very precise!) delimited by '`r' 235: <pre> 236: Timecode 237: YY-MM-DD-HH-MM-SS-FF\r 238: 239: FF&0x1 - DST 240: FF&0x2 - DST switch warning 241: FF&0x4 - unsynchronised 242: </pre> 243: <hr> 244: <h4>HOPF 6021 und Kompatible</h4> 245: HOPF Funkuhr 6021 mit serieller Schnittstelle Created by F.Schnekenbuehl <frank@comsys.dofn.de> from clk_rcc8000.c Nortel DASA Network Systems GmbH, Department: ND250 A Joint venture of Daimler-Benz Aerospace and Nortel. 246: <pre> 247: hopf Funkuhr 6021 248: used with 9600,8N1, 249: UTC via serial line 250: "Sekundenvorlauf" ON 251: ETX zum Sekundenvorlauf ON 252: dataformat 6021 253: output time and date 254: transmit with control characters 255: transmit evry second 256: </pre> 257: Type 6021 Serial Output format 258: <pre> 259: 000000000011111111 / char 260: 012345678901234567 \ position 261: sABHHMMSSDDMMYYnre Actual 262: C4110046231195 Parse 263: s enr Check 264: 265: s = STX (0x02), e = ETX (0x03) 266: n = NL (0x0A), r = CR (0x0D) 267: 268: A B - Status and weekday 269: 270: A - Status 271: 272: 8 4 2 1 273: x x x 0 - no announcement 274: x x x 1 - Summertime - wintertime - summertime announcement 275: x x 0 x - Wintertime 276: x x 1 x - Summertime 277: 0 0 x x - Time/Date invalid 278: 0 1 x x - Internal clock used 279: 1 0 x x - Radio clock 280: 1 1 x x - Radio clock highprecision 281: 282: B - 8 4 2 1 283: 0 x x x - MESZ/MEZ 284: 1 x x x - UTC 285: x 0 0 1 - Monday 286: x 0 1 0 - Tuesday 287: x 0 1 1 - Wednesday 288: x 1 0 0 - Thursday 289: x 1 0 1 - Friday 290: x 1 1 0 - Saturday 291: x 1 1 1 - Sunday 292: </pre> 293: <hr> 294: <h4>Diem Computime Clock</h4> 295: The Computime receiver sends a datagram in the following format every minute 296: <pre> 297: Timestamp T:YY:MM:MD:WD:HH:MM:SSCRLF 298: Pos 0123456789012345678901 2 3 299: 0000000000111111111122 2 2 300: Parse T: : : : : : : \r\n 301: 302: T Startcharacter "T" specifies start of the timestamp 303: YY Year MM Month 1-12 304: MD Day of the month 305: WD Day of week 306: HH Hour 307: MM Minute 308: SS Second 309: CR Carriage return 310: LF Linefeed 311: </pre> 312: <hr> 313: <h4>WHARTON 400A Series Clock with a 404.2 Serial interface</h4> 314: The WHARTON 400A Series clock is able to send date/time serial messages in 7 output formats. We use format 1 here because it is the shortest. We set up the clock to send a datagram every second. For use with this driver, the WHARTON 400A Series clock must be set-up as follows : 315: <pre> 316: Programmable Selected 317: Option No Option 318: BST or CET display 3 9 or 11 319: No external controller 7 0 320: Serial Output Format 1 9 1 321: Baud rate 9600 bps 10 96 322: Bit length 8 bits 11 8 323: Parity even 12 E 324: </pre> 325: WHARTON 400A Series output format 1 is as follows : 326: <pre> 327: Timestamp STXssmmhhDDMMYYSETX 328: Pos 0 12345678901234 329: 0 00000000011111 330: 331: STX start transmission (ASCII 0x02) 332: ETX end transmission (ASCII 0x03) 333: ss Second expressed in reversed decimal (units then tens) 334: mm Minute expressed in reversed decimal 335: hh Hour expressed in reversed decimal 336: DD Day of month expressed in reversed decimal 337: MM Month expressed in reversed decimal (January is 1) 338: YY Year (without century) expressed in reversed decimal 339: S Status byte : 0x30 + 340: bit 0 0 = MSF source 1 = DCF source 341: bit 1 0 = Winter time 1 = Summer time 342: bit 2 0 = not synchronised 1 = synchronised 343: bit 3 0 = no early warning 1 = early warning 344: </pre> 345: <hr> 346: <script type="text/javascript" language="javascript" src="scripts/footer.txt"></script> 347: </body> 348: 349: </html>