
Displaying the sequence steps through the output lines
(HP 54656A only)
Sometimes, it is convenient to display the step number in a remote unit
hosting the Next and Reset key. This can be achieved by a simple circuit
which uses the user-definable output lines.
Two output lines can be used to drive a simple circuit consisting of a counter
IC, LED driver, and a seven-segment LED. A sample circuit is shown in the
following figure.
Example circuit for displaying the sequence step number using the output lines
Output line 1 is used as a reset signal to the counter. Output line 2 is used to
drive the counter when a step is executed. The counter in turn drives the
LED driver and the sequence step number is displayed on the seven-segment
LED.
If additional output lines are available, they can be toggled on and off to drive
the decoder/LED driver directly without using a counter. A maximum of 32
combinations can be generated by the five output lines.
Figure 19
Solutions
Displaying the sequence steps through the output lines (HP 54656A only)
72
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