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XLi Time & Frequency System 145

XLi-man, Issue 8, 6/17/2008, Rev. H

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wildcard-digit in the time field is used to specify the Start (or Stop) Time of the repetitive pulses, which in

turn specifies the pulse width of the repetitive pulses. The least significant “wildcard” character (the one

to the immediate left of the most significant non-wildcard-digit) specifies the period of repetition.

When specifying repetitive rates, the Start Time must include the same number of significant digits as the

Stop Time or an ambiguous output may occur.

Any time the clock reads a new time that matches the specified least significant digits, a pulse either

starts or stops. For example, the following string produces a one-second pulse at midnight on every day

of the year with a “1” in the least significant digit:

F111 PPO XX1:00:00:00.000000 XX1:00:00:01.000000<CR>

For example, to produce a repetitive 5 microsecond pulse occurring every 10 microseconds (i.e.,

repetitive pulses with 100 kHz frequency with the start time or rising-edge on-time and the stop time or

falling-edge at 5

μS- or 10 μS pulse period with 5 μS pulse width), enter:

F111 PPO XXX:XX:XX:XX.XXXXX0 XXX:XX:XX:XX.XXXXX5<CR>

The XLi responds:

OK<CR><LF>

Or, for example, to produce a repetitive 50-microsecond pulse occurring every 100 microseconds (i.e.,

repetitive pulses with 10 kHz frequency with the start time or rising-edge at 5

μS and the stop time or

falling-edge at 55

μS - or 100 μS pulse period with 50 μS pulse width), enter:

F111 PPO XXX:XX:XX:XX.XXXX05 XXX:XX:XX:XX.XXXX55<CR>

The XLi responds:

OK<CR><LF>

Or, for example, to produce a repetitive 50-microsecond pulse occurring every 100 milliseconds (i.e.,

repetitive pulses with 10 PPS frequency with the start time or rising-edge at 5

μS and the stop time or

falling-edge at 55

μS - or 100ms pulse period with 50 μS pulse width), enter:

F111 PPO XXX:XX:XX:XX.X00005 XXX:XX:XX:XX.X00055<CR>

Clock Reading

Pulse

001:00:00:00.000000 Start

001:00:00:00.000001 No Change

001:00:00:01.000000 Stop

001:01:00:00.000000 No Change

001:00:00:00.000000 Start (etc...)

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Symmetricom XLi User Manual

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