Chapter 5
VXI-MXI-2 Configuration and Installation
MXI-2 Configuration Reference Manual
5-12
ni.com
Use switch 2 of U35 to select whether the VXI-MXI-2 automatically
controls termination of the MXIbus. Notice in Figure 5-8a that switch 1 has
no effect when switch 2 is set for automatic MXIbus termination. To control
termination manually, you must turn off switch 2. You can then use
switch 1 of U35 to manually control whether to terminate the MXIbus.
Figure 5-8.
MXIbus Termination
Configuration EEPROM
The VXI-MXI-2 has an onboard EEPROM, which stores default register
values that are loaded at power-on. The EEPROM is divided into two
halves—a factory-configuration half and a user-configuration half—so you
can modify the user-configurable half while the factory-configured half
stores a backup of the default user settings.
Use switches 3 and 4 of the four-position switch at location U35 to control
the operation of the EEPROM. The Restore Factory Configuration switch
(switch 4) causes the VXI-MXI-2 to boot from the factory-configured half
a. Automatic MXIbus Termination (Default)
Restore Factory Configuration
Change Factory Configuration
Automatic MXIbus Termination
Terminate MXIbus
Yes
Yes
No
No
No
No
Yes
Yes
U35
1234
b. Terminate MXIbus (On)
Restore Factory Configuration
Change Factory Configuration
Automatic MXIbus Termination
Terminate MXIbus
Yes
Yes
No
No
No
No
Yes
Yes
U35
1234
c. Do Not Terminate MXIbus (Off)
Restore Factory Configuration
Change Factory Configuration
Automatic MXIbus Termination
Terminate MXIbus
Yes
Yes
No
No
No
No
Yes
Yes
U35
1234