Setting the Logical Address

Each module within the VXIbus mainframe must be set to a unique logical address. The setting is controlled by an 8 pin dip switch. This allows for values from 0 to 255. The factory setting of this switch is decimal 144. No two modules in the same mainframe can have the same logical address. The location is shown in Figure 1-5.

Setting the Interrupt Priority

Note

At power on, after a SYSRESET, or after resetting the module via the control register, all masks will be cleared, interrupts will be disabled, and internal triggering will be enabled. With interrupts enabled, an interrupt will be generated whenever an edge occurs on a channel that has been enabled properly.

The interrupt priority jumper selects which priority level will be asserted. As shipped from the factory, the interrupt priority jumper should be in position 1. In most applications this should not be changed. When set to level X interrupts are disabled. The interrupt priority jumpers are identified on the sheet metal shield. A hole has been cut into the shield for access to the jumpers. Interrupts can also be disabled using the Control Register.

The jumper locations are shown in Figure 1-5.To change the setting, move the jumper or jumpers to the desired setting. If the card uses two 2-pin jumpers versus a single 4 pin jumper, the jumpers must all be placed in the same row for proper operation.

Consult your mainframe manual to be sure that backplane jumpers are configured correctly. If you are using the HP E1401B Mainframe these jumpers are automatically set when the card is installed.

Figure 1-5. HP E1459A Logical Address Switch and IRQ Jumper Locations

20 Installing and Configuring the HP E1459A