National Instruments 370551A-01 用户手册

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 
you manually control whether to terminate the MXIbus when automatic 
termination is turned off. Switch 1 has no effect when switch 2 is set for 
automatic MXIbus termination; you must turn off automatic termination 
if you want to manually control termination.

Figure 3-9.  MXIbus Termination

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. Both 
halves were factory configured with the same configuration values so you 
can modify the user-configurable half, while the factory-configured half 
stores a back-up of the default user settings.

a. Automatic MXIbus Termination (Default)

b. Terminate MXIbus (On)

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

12

34

Restore Factory Configuration
Change Factory Configuration

Automatic MXIbus Termination

Terminate MXIbus

Yes
Yes
No
No

No
No

Yes
Yes

U35

12

34

Restore Factory Configuration
Change Factory Configuration

Automatic MXIbus Termination

Terminate MXIbus

Yes
Yes
No
No

No
No

Yes
Yes

U35

12

34