Selecting The Interrupt Priority - HP E1343A User Manual

Selecting the Interrupt Priority

Figure 2-4. Changing the Priority Interrupt Level Jumpers
26 Configuring the Relay Multiplexer Modules
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The multiplexer modules generate interrupts after a channel relay closing or
opening completes. These interrupts set the selected line on the VXI
peripheral interrupt bus true.
The VXI peripheral interrupt bus consists of 7 interrupt priority lines that
carry the interrupt signal to the commander. Line 1 has the highest priority
and line 7 the lowest. The multiplexer module's default setting is line 1, since
it is the most commonly used interrupt line.
The HP E1300A/E1301A Mainframe default operation is to monitor all
seven interrupt lines. The HP E1405B/E1406A Command Module's default
operation is to manage only one line. The Command Module does, however,
use an interrupt line allocation table that allows you to select which lines the
command module is to monitor. For embedded controllers, refer to the
appropriate controller documentation to determine which of the line(s) the
controller monitors.
When using an HP E1300A/E1301A Mainframe or HP E1405B/E1406A
Command Module for register-based programming (instead of the SCPI
driver) and where the program generates an interrupt, be sure to use the
multiplexer module's interrupt line that does not interfere with the program.
Use the line that is not used by the SCPI driver to generate interrupts.
Refer to Figure 2-4 to change the interrupt priority. Unsolder and remove
two jumpers from the old priority location. Install the jumpers in the new
priority location (Figure 2-4 shows a priority change from 1 to 7).
Chapter 2