Trigger Input Termination; Mxibus Termination - National Instruments MXI-2 Reference Manual

Caution Do not configure more than one MXIbus device to drive the MXIbus CLK10.
Having a second device driving MXIbus CLK10 could damage the device.

Trigger Input Termination

MXIbus Termination

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If you change the S1 setting to drive CLK10 out the MXIbus, do not set the
W1 jumper setting to receive the MXIbus CLK10. Instead, use the settings
shown in Figure 6-4a or 6-4b as appropriate.
Figure 6-6 shows the configuration settings for receiving and driving
MXIbus CLK10, respectively.
MBCLK10
IN OUT
a. Receive CLK10 from
MXIbus (Default)
Figure 6-6. Receiving or Driving MXIbus CLK10
You can use switch S5 to terminate the external trigger input SMB with
50 Ω. Figure 6-7a shows the default setting for a nonterminated trigger
input SMB. Use the setting of Figure 6-7b to terminate the trigger
input SMB.
( = NO)
TERM TRIGIN
a. Non-Terminated External Trigger
Input SMB (Default)
Figure 6-7. SMB Trigger Input Termination
The first and last MXIbus devices connected to the MXIbus—whether
using 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/B 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 3 and 4 of
Chapter 6 VXI-MXI-2/B Configuration and Installation
S1
b. Drive MXIbus CLK10 from
b. Terminated External Trigger
6-9 MXI-2 Configuration Reference Manual
MBCLK10 S1
IN OUT
VXIbus CLK10
( = NO)
TERM TRIGIN
Input SMB with 50 Ω