84
•
Using the DAS-1700 Series with DriverLINX
Keithley DAS-1700 Series
Parameter
Option
Service Request Properties
Pacing Mode
Periodic (paced)
Rate generator timing event
Clock Source
Software
Single-value or single-scan
(Polled mode)
Internal
Rate timing event with an internal
clock source
Ex/-
Rate timing event with an external
clock source
Digital timing event
Trigger
Internal (software)
Command start event
Command stop event
Terminal count stop event
Digital Input Timing Events
Timing Events specify how the hardware paces or clocks the reading of Digital Input
samples. DriverLINX uses the Timing Event to program when the DAS-1700 Series
reads the next digital input sample from the port.
The DAS-1700 Series supports the following Timing Events:
•
None—Input requires no pacing as DriverLINX is reading only a single
value.
•
Rate—The DAS-1700 Series supports fixed rate writing using internal
and external clocks.
None or Null Timing Event
The Null Event specifies that the task does not need a clock to determine when to
read the next sample.
Rate Timing Event
The DAS-1700 Series supports one type of Rate Event for digital output:
•
Rate Generator—Generates a fixed rate clock with equal time
intervals between tics.
DAS-1700 boards have a 5 MHz master clock frequency, or 0.2
µ
s tic period. The
sample period can range from 500 tics (100
µ
s) to
2
1
32
−
tics (833 s). This means
the sample rate can range from 0.00116 Hz to 10kHz.
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