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Chapter 2
Device Overview
Transfer Rates
The maximum sustainable transfer rate a TIO device can achieve for a
buffered acquisition depends on the following factors:
•
•
•
To reduce the amount of bus activity, limit the number of devices
generating bus cycles. Because direct-memory access (DMA) transfers are
faster than interrupt-driven transfers, NI-DAQmx uses DMA by default for
buffered acquisitions.
Note
The maximum sustainable transfer rate is always lower than the peak transfer rate.
Table 2-1 lists the maximum transfer rates for TIO devices.
Buffer Size
Operation
(Samples)
100
1,000
Finite
10,000
100,000
100
1,000
Continuous
10,000
100,000
default
Transfer rates may vary depending on your computer hardware, operating system
Note
and system activity. This benchmark data was determined on an AMD Athlon XP 1800
computer with 128 MB of PC-2100 DDR RAM running Windows XP and LabVIEW using
NI 660x User Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Amount of available bus bandwidth
Processor speed and operating system
Application software
Table 2-1. Maximum Transfer Rates
DMA
Rate (kS/s)
5,000
2,150
1,600
1,350
44
202
212
245
212
2-8
Interrupt
Buffer Size
(Samples)
Rate (kS/s)
100
77
1,000
77
10,000
77
100,000
77
100
7
1,000
46
10,000
75
100,000
76
default
75
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