Programming The Digital I/O Module; Scpi Command Format Used In This Manual; Setting The Interrupt Priority - Keysight VXI Bus 75000 C Series User And Programming Manual

Configuring the Keysight E1458A Digital I/O Module

Setting the Interrupt Priority

The VXIbus peripheral interrupt uses seven lines to carry the interrupt signal to
the commander. The most common line to be used is line one, as this is the usual
default interrupt line. Many VXIbus commanders have a way to change the
interrupt line they manage (for example, the Keysight E1405/E1406 has an
interrupt line allocation table). When doing direct register-based programming
(instead of using the register-based SCPI driver), set the interrupt line to a line
that is not used by the register-based SCPI driver. Module interrupt priority can
be established with these lines; in general, the higher the line number, the higher
the priority. Figure 2-2 shows the location and factory default setting of the
interrupt priority jumper. Setting Level X disables the interrupt capability.
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The interrupt priority MUST be set to a line handled by the
command module when using and Keysight E1405 or Keysight
E1406 Command Module. Level X priority should not be used
under normal operating conditions. Changing the interrupt priority
level is not recommended. Do not change the default setting (level
1) unless specifically instructed to do so.
The interrupt circuitry for the Keysight E1458A Digital I/O Module
is implemented as release on interrupt acknowledge (ROAK). The
digital I/O module will de-assert (or release) the interrupt request
line during an interrupt acknowledge cycle.
Keysight E1458A 96-Channel Digital I/O Module User Guide
Setting the Interrupt Priority