50
•
Using the DAS-1700 Series with DriverLINX
Keithley DAS-1700 Series
Digital Start Events contain mask, pattern, and match fields. The mask is logically
ANDed with the digital input data on the Logical Channel and then compared with
the pattern for a match/mismatch.
•
Specify the Channel as
2
. For hardware-independence, you can specify
the hardware external trigger channel by the symbolic constant,
DI_EXTTRG.
•
Users should connect the external trigger signal to the TGIN line.
•
Specify the Mask property as
1
, or
Bit 0
, to indicate that DriverLINX
should only compare a 1-bit digital input value against the Pattern
property.
•
Specify the Match property as
Not equals
.
•
Specify the Pattern property as
0
for a rising, or positive, edge trigger
(
≠
0) or
1
for a falling, or negative, edge trigger (
≠
1).
•
Specify the Delay property as 0. The DAS-1700 does not support a
delay in sampling after the start trigger.
•
You cannot use a digital start trigger with a gated clock.
•
If both the start trigger and stop trigger are digital events, they must
have identical Pattern settings.
Digital Start Event (Gating)
The DAS-1700 can pause and resume acquiring analog input samples based on the
level of a digital input condition. Use a digital start event to set up gating when using
a digital timing event. To set up gating for a rate timing event, see “Rate Timing
Event” on page 40.
How to set up the DAS-1700 Series for gated analog input.
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