BNC 577 - Manual (Page 9)

Model 577 Operating Manual 5
3.4 Digital Output Multiplexer
The outputs of the Channel Timers are routed to a set of multiplexers. This allows routing of any or all Channel
Timers to any or all of the unit outputs. In the normal mode of operation, the output of the Channel “x” Timer is
routed to the Channel “x” output connector. As an example, if a double pulse is required on Channel A output,
one may multiplex the Channel A timer with the Channel C timer adjusting each timer to provide the necessary
pulses. Only timing parameters are multiplexed together, not amplitudes.
-HGFE DCBA-
Mux: -0000 0101-
The multiplexer is represented by a “n” bit binary number as shown above. “n” is the number of channels. Each bit
represents a channel timer, which is enabled by setting the bit to one. In the above example, timers A and C are
combined on the current output.
3.5 Dependent & Independent Timing Events
The 577 allows the user to control the relationship between the Channel Timers by setting the sync source for
each timer. Independent events are all timed relative to the internal T
0
start pulse. Dependent events may be
linked together by setting the sync source to the controlling event. This allows the instrument to match the timed
events and adjustments can be made in one event without detuning the timing between it and a dependent event.
For example, the Channel A timer and the Channel B timer may each be selected to use T
0
as their sync source,
whereas the Channel C timer may be selected to use Channel A as its sync source so that it is dependent upon
the output of Channel A. A user may elect to individually alter Channel A or Channel B timer settings as
necessary for an application without having to also alter Channel C. The function of Channel C will continue to be
dependent with respect to the function of Channel A.