Appendix B
Common Questions
©
National Instruments Corporation
B-5
Series front panel use TTL levels; therefore, you need to supply a
TTL-level signal for EXTCLK. Our voltage converters convert the signal
to differential ECL. You cannot drive CLK10 externally on the VXIpc 700
Series.
What is the accuracy of the CLK10 signal?
The CLK10 signal generated by all of the VXIpc controllers is ±100 ppm
(0.01%) as per the VXIbus specification. If you need a more accurate
CLK10 signal on the VXIpc 800 Series, you can use the EXTCLK
connector on its front panel.
What kind of monitor can I use with the VXIpc controller?
VXIpc computers that use Super VGA video output work only with
monitors having a horizontal scan rate of at least 50 kHz and a vertical
scan rate of 60 Hz.
Caution
Make sure your monitor meets this specification. Enabling the Super VGA option
on a monitor that does
not
meet this specification will damage your monitor.
What should I do if my keyboard connector does not fit into the
keyboard port on the VXIpc controller?
You can plug keyboards that have a 6-pin Mini DIN PS/2 type connector
directly into the VXIpc. You can use the keyboard adapter cable included
with every VXIpc 800 Series kit to adapt the larger AT keyboard connector
to the 6-pin Mini DIN connector.
How do I connect an external speaker to get audio capability?
♦
VXIpc 800 Series users only
—A twisted-pair cable connects the front
panel audio connector to the VXIpc 800 Series motherboard. Connect
the external speaker to this front-panel connector. The center pin of the
connector provides the audio signal. The shield of the connector is
GROUND.
How do I add RAM to the VXIpc? What is the maximum amount of
RAM that I can have?
For information about adding RAM to the VXIpc controller, refer to
Appendix A,
Specifications
, in your VXIpc user manual.
