User`s manual

VXIbus Interrupt
Lines
The multimeter sends interrupts to, and receives acknowledgements from
the slot 0 module via the VXIbus backplane interrupt lines. Since the
multimeter is a nonprogrammable interrupter, the interrupt line is selected
with the multimeter’s IRQ jumper.
There are seven backplane interrupt lines. At the factory, the IRQ jumper is
set to line 1. The system instrument in the Series B mainframe is assigned
to each line, and the system instrument in the HP E1406A command module
is assigned to line 1 by default. Therefore, in Series B systems it is not
necessary to change the IRQ jumper setting. If the command module in
Series C systems is assigned another line and the multimeter is to use that
line, the IRQ jumper must be set accordingly. Figure 2-3 shows the location
of the jumpers used to select an interrupt line. For most applications where
the multimeter is installed in an HP 75000 Series B or Series C mainframe,
the jumpers do not have to be moved.
Note IRQ OFF is set when the multimeter is installed in systems without a Series B
mainframe or HP E1406A command module.
Interrupt Priority In the HP 75000 Series B and Series C mainframes, the VXIbus interrupt
lines have the same priority; therefore, interrupt priority is established by
installing modules in slots numerically closest to the slot 0 module. Thus,
slot 1 (internal on the Series B mainframe) has a higher priority than slot 2
(also internal), slot 2 has a higher priority than slot 3, and so on.
Interrupt
Jumper
Location
Interrupt
Jumper
Location
HP E1411BHP E1326B
Figure 2-3. Interrupt Jumper Locations
24 Configuring the HP E1326B/E1411B Multimeter Chapter 2