Chapter 3
VXIpc 800 Series Configuration and Installation
©
National Instruments Corporation
3-7
When switch S5 is set so that the VXIpc-800 receives the SMB CLK10
signal, you have the option to add a 50
Ω
termination to the signal by
setting switch S6. Switch S6 is unused—its setting does not matter—
when S5 is configured to drive the external CLK SMB signal.
Figure 3-5 shows the settings for switch S6.
Figure 3-5.
SMB CLK10 Termination
You can use an additional switch, S4, to control the polarity of the
external CLK SMB signal when S5 is configured to drive it. S4 is
unused—its setting does not matter—when S5 is configured to receive
the external CLK SMB signal.
Figure 3-6.
SMB CLK10 Polarity
S6
S6
a. Does Not Terminate CLK10
SMB Input (Default)
b. Terminates CLK10
SMB Input
S4
S4
a. Noninverted CLK10 Output
from SMB (Default)
b. Inverted CLK10 Output
from SMB
