User manual

Getting Started 17Chapter 1

Setting the Status

Four bits of the Status Register (bits 10-13) define whether the multiplexer

module is set for one-wire, two-wire, three-wire, or four-wire switching. To

ensure proper operation, set the status register switch as shown in Figure

1-3.

Setting the Interrupt

Priority

The multiplexer module generates an interrupt after a channel has been

closed. These interrupts are sent to, and acknowledgments are received

from, the command module (such as an E1406A) via the VXIbus backplane

interrupt lines.

For most applications where the 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 1-4 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 from the old priority location

and reinstall in the new priority location. If the 4-pin jumper is not used, the

two jumper locations must have the same interrupt priority level selected.

Figure 1-3. Setting the Status Register Switch

2-wire, Dual 32-channel

4-wire, 32-channel

3-wire, 32-channel

2-wire, 64-channel

1-wire, 128-channel

Example shows

switch set

to 4-wire

010

Status Register

Switch Location