Mxibus Termination - National Instruments MXI Series Getting Started

S2 Off
S3 Out
S4 Off
S5
S2 Off
S3 Out
S4 Off
S5

MXIbus Termination

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On 50Ω Termination for External Trigger Input
In
SMB CLK10 Direction
On 50Ω Termination for SMB CLK10 (Effective only when S3 is set to "IN" )
SMB CLK10 Output Polarity (Effective only when S3 is set to "OUT")
NON-INVERTED
INVERTED
a. Non-Terminated External Trigger Input SMB (Default)
On 50Ω Termination for External Trigger Input
In
SMB CLK10 Direction
On 50Ω Termination for SMB CLK10 (Effective only when S3 is set to "IN")
SMB CLK10 Output Polarity (Effective only when S3 is set to "OUT")
NON-INVERTED
INVERTED
b. Terminated External Trigger Input SMB with
Figure 3-8. SMB Trigger Input Termination
The first and last MXIbus devices connected to the MXIbus—whether it is
a single MXI-2 cable or daisy-chained MXI-2 cables—must terminate the
MXIbus. Any MXIbus devices in the middle of a MXIbus daisy chain must
not terminate the MXIbus.
The VXI-MXI-2 automatically senses whether it is at either end of the
MXIbus cable to terminate the MXIbus. You can manually control MXIbus
termination by defeating the automatic circuitry. Use switches 1 and 2
of the four-position switch at location U35 to control whether MXIbus
termination is automatic (Figure 3-9a), on (Figure 3-9b), or off
(Figure 3-9c). The settings of switches 3 and 4 have no effect on MXIbus
termination.
Use switch 2 of U35 to select whether you want the VXI-MXI-2 to
automatically control termination of the MXIbus. Switch 1 of U35 lets
Chapter 3 VXI-MXI-2 Configuration and Installation
50Ω
3-13 PCI-MXI-2 for Linux