Meinberg FDM511 - Manual (Page 14)

14
Serial Output Strings
Several output strings are available with the FDM511. Selection is made in the setup
menu "Str.COM0" and "Str.COM1". The format of the output strings as well as related
input strings or commands are described in the following.
Standard FDM String
The STANDARD string is a sequence of 62 ASCII characters containing the frequency
F, the frequency deviation FD, the REF time, the power line time PLT and the time
deviation TD, each item seperated by a space character. The string is send out at the
beginning of every new REF time second and ends with the characters Carriage-Return
(ASCII code 0Dh) and Line-Feed (ASCII code 0Ah). The letters displayed in italics are
replaced by the calculated values whereas the other characters are part of the string:
F:49.984_FD:-00.016_REF:15:03:30_PLT:15:03:30.378_TD:+00.378
The meaning of the several values is described below:
F:49.984 The measured power line frequency with a resolution of 1mHz
FD:-00.016 The frequency deviation between calculated and nominal frequency,
with sign character (+/-), resolution: 1mHz, maximum: ±09.999Hz
REF:15:03:30 The reference time from the preconnected clock,
(hours:minutes:seconds)
PLT:15:03:30.378 The power line time, based on the mains frequency,
(hours:minutes:seconds.milliseconds)
Time jumps, like changeover in daylight saving or leap seconds,
will not be executed by the PL time!
TD:+00.378 The time deviation between REF time and PL time,
with sign character (+/-), resolution: 1ms, maximum: ±99.999s