When tone mode is switched on the source for TRIG IN is automatically switched to
external
on the
TRIGGER INPUT SETUP
screen and cannot be changed. The
slope
, however, can be
set to either
positive
or
negative
;
positive
means that a high level at TRIG IN will be
treated as true and
negative
means that a low level will be true; the setting on both generators
should be the same.
TRIG IN of both generators should be connected to the same external signal. When the trigger
signal first goes true (as defined above) both generators will output the first frequency in their
respective lists; when the trigger signal goes false the tones will stop; when the trigger goes true
again the generators will output the next frequencies in their lists, and so on. It is important that
no keys are pressed on either generator (or remote commands sent) that might cause the
generators to lose the synchronisation between the lists of frequencies; if this happens
synchronisation can be restored by pressing both
tone
soft-keys again to take both generators
to the first frequency on the list.
SYNC OUT defaults to
trigger
and outputs a positive-edged version of the actual external
trigger signal used.
The frequencies from the 2 generators are summed for DTMF by connecting the MAIN OUT of
one generator to the VCA/SUM IN of the second. SUM mode is selected on the second generator
on the
EXT VCA/SUM SETUP
screen, called by pressing the VCA/SUM IN key; see External
SUM In section for details.
The above connections for TRIG IN and SYNC OUT also apply to 1, 3 or more generators used
in Tone mode; frequencies from 3 or more generators can be summed by “daisy-chaining” the
output from one generator into the VCA/SUM IN of the next.
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