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Chapter 2
Device Overview
Transfer Rates
Note
The maximum sustainable transfer rate is always lower than the peak transfer rate.
Buffer Size
Operation
Finite
Continuous
Note
Transfer rates may vary depending on your computer hardware, operating system
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
The maximum sustainable transfer rate a TIO device can achieve for a
buffered acquisition depends on the following factors:
•
Amount of available bus bandwidth
•
Processor speed and operating system
•
Application software
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.
Table 2-1 lists the maximum transfer rates for TIO devices.
Table 2-1. Maximum Transfer Rates
DMA
(Samples)
Rate (kS/s)
100
1,000
10,000
100,000
100
1,000
10,000
100,000
default
Buffer Size
(Samples)
5,000
2,150
1,000
1,600
10,000
1,350
100,000
44
202
1,000
212
10,000
245
100,000
212
default
2-8
Interrupt
Rate (kS/s)
100
100
77
77
77
77
7
46
75
76
75
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