Programming instructions

Chapter 19 Hardware and Software Setup for Your SCXI System
© National Instruments Corporation 19-3 LabVIEW Data Acquisition Basics Manual
Appendix B,
Hardware Capabilities
, in the
LabVIEW Function and VI
Reference Manual
, or refer to the LabVIEW
Online Reference
, by selecting
Help»Online Reference…
.
Figure 19-3.
SCXI Chassis
When you use SCXI as an external DAQ system, only some of the digital
I/O lines of the DAQ device are reserved for SCXI chassis communication
when other modules are present. The DAQ device digitizes any analog
input data and transfers it back to the computer through the parallel or
serial port.
Note
When using Remote SCXI, be aware of the sampling rate limitations due to the
fact that the data is sent over the serial port. To reduce delays in serial port
communication, National Instruments recommends that you use the fastest baud
rate possible for your computer’s serial port. If you have a 16550 or compatible
universal asynchronous receiver-transceiver (UART), you can use baud rates up
to 57,600 baud. If you have an 8250 or compatible UART, you can only use up to
19,200 baud.
SCXI-1000
SCXI
MAINFRAME
Unconditioned Signals
from Transducers
Analog and Digital
Bus Backplane
Conditioned Signals to
DAQ Board or
Parallel Port