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Appendix A Specifications
©
National Instruments Corporation A-3 PC-DIO-24/PnP User Manual
Environment
Operating temperature ........................0° to 70° C
Storage temperature ............................–55° to 150° C
Relative humidity ...............................5% to 90% noncondensing
Transfer Rates
Max with NI-DAQ software................50 kbytes/s
Constant sustainable rate (typ)............1 to 10 kbytes/s
Transfer rates are a function of the speed with which your program
reads data from or writes data to the board, and therefore vary with your
system, software, and application. The following primary factors
control PC-DIO-24/PnP transfer rates:
• Computer system performance
• Programming environment (register-level programming or
NI-DAQ)
• Programming language and code efficiency
• Execution mode (foreground or background, with background
execution typically using interrupts)
• Other operations in progress
• Application
For example, you can obtain higher transfer rates in a handshaking or
data-transfer application, requiring an average rate, than in a pattern
generation, data acquisition, or waveform generation application,
requiring a constant sustainable rate.
The maximum rate shown was obtained using a 233 MHz Pentium
computer running NI-DAQ and LabWindows/CVI software, with
interrupt-based execution, and with no other high-speed operations in
progress.