National Instruments MXI-2 Series User Manual

Chapter 3 VXI-MXI-2 Configuration and Installation
© National Instruments Corporation 3-13 PCI-MXI-2 for Linux
Figure 3-8. SMB Trigger Input Termination
MXIbus 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
a. Non-Terminated External Trigger Input SMB (Default)
b. Terminated External Trigger Input SMB with 50Ω
S2 Off
On 50Ω Termination for External Trigger Input
S3 Out
In
S4 Off
On
NON-INVERTED
INVERTED
S5
SMB CLK10 Direction
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”)
50Ω Termination for SMB CLK10 (Effective only when S3 is set to “IN” )
S2 Off
On 50Ω Termination for External Trigger Input
S3 Out
In
S4 Off
On
NON-INVERTED
INVERTED
S5
SMB CLK10 Direction
SMB CLK10 Output Polarity (Effective only when S3 is set to “OUT”)

National Instruments MXI-2 Series Specifications

General

Brand	National Instruments
Model	MXI-2 Series
Category	Recording Equipment
Language	English