Keithley DAS-1700 Series
Using the DAS-1700 Series with DriverLINX
•
51
Digital Start Events contain mask, pattern, and match fields. The mask selects which
bit in the Logical Channel to use as a gate input. The pattern selects whether the gate
is active, or enables data-acquisition, when the gate signal is high or low.
•
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 identify the gate input bit
of the Logical Channel.
•
Specify the Match property as
Equals
.
•
Specify the Pattern property as
0
for a low-level active gate or
1
for a
high-level active gate.
•
Specify the Delay property as 0. DriverLINX does not use a delay with
gating.
Analog Input Stop Events
Stop Events specify when the hardware stops acquiring analog input data.
The DAS-1700 Series supports the following Stop Events:
•
None—Use this event when the DriverLINX operation doesn’t require
a Stop Event.
•
Command—DriverLINX stops the task on software command, i.e.,
when the application issues a Service Request with a Stop operation.
•
Terminal count—DriverLINX stops the task after the data-acquisition
hardware has filled all the data buffers once.
•
Digital—The DAS-1700 stops acquiring analog input samples when
the hardware detects the digital Logical Channel input satisfies the
condition specified in the Stop Event.
None or Null Stop Event
The Null Event specifies that the task does not need a Stop Event to end the task.
Command Stop Event
The Command Event stops data acquisition when the user application changes the
Operation property in the Service Request to Stop and resubmits the Service Request
to DriverLINX.
In Stop-on-Command mode, DriverLINX continuously cycles through all the data
buffers filling them with analog input data from the data-acquisition hardware.
Terminal Count Stop Event
The Terminal Count Event stops data acquisition after DriverLINX has filled all the
data buffers once with analog input data. Use Terminal Count when you want to
acquire a single scan or fixed amount of data.
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