Configuring the RF Multiplexers 19
Chapter 2
Selecting the Interrupt Priority
The RF Multiplexer module generates an interrupt after a channel has been
closed. These interrupts are sent to, and acknowledgements are received
from, the command module via the VXIbus backplane interrupt lines.
For most applications where the RF Multiplexer module is installed in a
C-Size mainframe, the interrupt priority jumper does not have to be moved.
This is because the VXIbus interrupt lines have the same priority and
interrupt priority is established by installing modules in slots numerically
closest to the command module. Thus, slot 1 has a higher priority than slot
2, slot 2 has a higher priority than slot 3, etc.
See Figure 2-2 to change the interrupt priority. You can select eight different
interrupt priority levels. Level 1 is the lowest priority and Level 7 is the
highest priority. Level X disables the interrupt. The module’s factory setting
is Level 1. To change, remove the 4-pin jumper (part number 1258-0247)
from the old priority location and reinstall in the new priority location (Figure
2-2 shows a priority change from 1 to 7). If the 4-pin jumper is not used, the
two jumper locations must have the same interrupt priority level selected
(see Figure 2-2).
NOTE
Level X interrupt priority should not be used under normal operating
conditions. Changing the priority level jumper is not recommended. Do not
change unless specifically instructed to do so.
Figure 2-2. Interrupt Priority Selection
IRQ
IRQ
3
X
1
2
6
4
5
7
3
X
2
1
6
5
4
7
Using 4-Pin
Jumper or Shorts
Using 2-Pin
Jumper
Priority
Selection
Interrupt
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
