Owner manual

TA660 User's Manual Catalyst Enterprises, Inc
125
External Signals/Trigger
Your TA660 analyzer can respond to an external trigger when
enabled in the Sequencer, (Programming the Sequencer on page 64)
or an output trigger may be issued. External signals may also be used
in the Sequencer for selective data capture.
To define trigger characteristics click Configuration on the main
menu bar and then select External Trigger Settings . . .
Figure 115 Input and Output Trigger Definition Dialog Box
Select the Source and polarity and the output polarity and click OK.
Trigger In The input trigger most be a TTL or CMOS level pulse of at
least 50 ns.
Trigger Out The output trigger is a TTL level that is set when Trigger
occurs in the sequencer after 5 clocks delay.
External Signals Input and output triggers are connected via J7 and J6
respectively on the edge of the TA660 Analyzer card. See
page 3 for locations of J6 and J7. For the TA660CA see
page 145.
Note: The external signals are assigned to 4 groups of four signals
each. The external signal selected in the Sequencer as an
input is a Boolean result of these 4 groups as an OR or as an
AND depending on the setup selected in the table above.
Therefore if only one bit is assigned, and it is expected for
the external signals to trigger or capture data when this bit
matches the defined pattern, the user must select an AND
function to assure the other bits set to XXXX..XX do not
cause false results.