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Analog Input Subsystem
C-17
Analog Output Initialization
By default, the Analog Output subsystem loads zero into both D/A
channels forcing the initial output voltage to zero. You can specify a
different initial output voltage using the DriverLINX
Configuration
Control Panel.
Internal Clocking
Specify internal clocking using a Rate Timing Event as a rate generator
(RATEGEN) on Logical Channel 0 (channel 1 for DAS-1800AO) with an
internal source. For hardware independence, the application may specify
the clock channel using the symbolic constant, DEFAULTTIMER, which
always uses the Logical Channel assigned by hardware for analog output.
Synchronous Analog Input/Output Clocking
The DAS-1800AO is ideal for use in “stimulus/response” type
applications where a signal is applied to a “circuit” to determine its
response characteristics (such as propagation delay time). The output
response of the circuit must be measured simultaneously with the
application of the stimulus to immediately capture the response for
precise calculation of delay times and phase angles. This technique will
eliminate the measurement errors caused by asynchronous analog I/O.
DriverLINX supports synchronous analog I/O using a shared pacing
clock source. To synchronize analog input with analog output, set up two
service requests as follows:
1. Analog Output Service Request (SR). The Timing Event should be a
Rate Generator using Logical Channel 0 (AI clock). This specifies
that the AO SR will use the same pacing source as the next, or
currently active, AI SR. The Period must be 0.
2. Analog Input SR with any valid Timing Event. When the AI task
starts sampling, the AO task will also sample using the same clock
source (internal or external).
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